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map[KernelBranch:master KernelCommit:8d3ae59288f1e7d58d76558a6ee96d533bc5019f KernelRepo:git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git]

map[KernelSrc:/app/workdir/cache/src/b5692495be56e63dd0879dd861d23f69899ae44d]

map[KernelObj:/app/workdir/cache/build/53faae23f7a2001af915820d6a0123902efa359b]

map[OtherCrashReports:[==================================================================
BUG: KASAN: slab-out-of-bounds in ptep_get include/linux/pgtable.h:495 [inline]
BUG: KASAN: slab-out-of-bounds in filemap_map_folio_range mm/filemap.c:3820 [inline]
BUG: KASAN: slab-out-of-bounds in filemap_map_pages+0x1100/0x2090 mm/filemap.c:3955
Read of size 8 at addr ffff888114627a00 by task syz-executor161/5872

CPU: 1 UID: 0 PID: 5872 Comm: syz-executor161 Not tainted syzkaller #1 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 ptep_get include/linux/pgtable.h:495 [inline]
 filemap_map_folio_range mm/filemap.c:3820 [inline]
 filemap_map_pages+0x1100/0x2090 mm/filemap.c:3955
 do_fault_around mm/memory.c:5818 [inline]
 do_read_fault mm/memory.c:5851 [inline]
 do_fault mm/memory.c:5994 [inline]
 do_pte_missing+0x21ac/0x3260 mm/memory.c:4566
 handle_pte_fault mm/memory.c:6379 [inline]
 __handle_mm_fault mm/memory.c:6517 [inline]
 handle_mm_fault+0x1ad6/0x3070 mm/memory.c:6686
 do_user_addr_fault+0x744/0x1340 arch/x86/mm/fault.c:1394
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0010:fault_in_readable+0x8e/0x130 mm/gup.c:2161
Code: a9 00 00 00 0f 01 cb 0f ae e8 4d 85 f6 40 0f 95 c5 4c 89 ff 4c 89 f6 e8 e0 e5 ae ff 4d 39 f7 0f 97 c0 40 84 c5 74 43 4d 89 f5 <41> 8a 45 00 88 44 24 07 49 81 e5 00 f0 ff ff 4d 8d a5 00 10 00 00
RSP: 0018:ffffc90003947aa8 EFLAGS: 00050202
RAX: ffffffff82167001 RBX: 0000000000000001 RCX: ffff8881fc64ca80
RDX: 0000000000000000 RSI: 00007f1044800000 RDI: 00007f1044800001
RBP: ffffc90003947c01 R08: ffff8881fc64ca80 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000000 R12: 00007ffffffff000
R13: 00007f1044800000 R14: 00007f1044800000 R15: 00007f1044800001
 fault_in_iov_iter_readable+0x1c8/0x310 lib/iov_iter.c:106
 generic_perform_write+0x7a0/0x8f0 mm/filemap.c:4413
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_pwrite64 fs/read_write.c:794 [inline]
 __do_sys_pwrite64 fs/read_write.c:802 [inline]
 __se_sys_pwrite64 fs/read_write.c:799 [inline]
 __x64_sys_pwrite64+0x196/0x220 fs/read_write.c:799
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1044d4ce5e
Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007f1042ffc1a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f1042ffc6c0 RCX: 00007f1044d4ce5e
RDX: 0000000000000001 RSI: 00007f1044800000 RDI: 0000000000000003
RBP: 0000000000000021 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffd0
R13: 0000000000000000 R14: 00007ffffa5261e0 R15: 00007ffffa5262c8
 </TASK>

Allocated by task 5816:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x32d/0x660 mm/slub.c:5489
 _kmalloc_noprof include/linux/slab.h:988 [inline]
 _kzalloc_noprof include/linux/slab.h:1309 [inline]
 bpf_prog_alloc_no_stats+0xd8/0x4f0 kernel/bpf/core.c:111
 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:156
 __get_filter+0xf2/0x420 net/core/filter.c:1515
 sk_attach_filter+0x24/0x140 net/core/filter.c:1550
 sk_setsockopt+0x2633/0x2e80 net/core/sock.c:1474
 do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2364
 __sys_setsockopt net/socket.c:2393 [inline]
 __do_sys_setsockopt net/socket.c:2399 [inline]
 __se_sys_setsockopt net/socket.c:2396 [inline]
 __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2396
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888114627000
 which belongs to the cache kmalloc-cg-2k of size 2048
The buggy address is located 536 bytes to the right of
 allocated 2024-byte region [ffff888114627000, ffff8881146277e8)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114620
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888114620811
flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000040 ffff88810004b3c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000100000080008 00000000f5000000 ffff888114620811
head: 017ff00000000040 ffff88810004b3c0 dead000000000100 dead000000000122
head: 0000000000000000 0000100000080008 00000000f5000000 ffff888114620811
head: 017ff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5708, tgid 5708 (syz-executor), ts 59404203394, free_ts 59394227649
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3266 [inline]
 allocate_slab+0x79/0x5e0 mm/slub.c:3380
 new_slab mm/slub.c:3426 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7310
 refill_sheaf mm/slub.c:2804 [inline]
 __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4675
 alloc_from_pcs mm/slub.c:4773 [inline]
 slab_alloc_node mm/slub.c:4905 [inline]
 __do_kmalloc_node mm/slub.c:5333 [inline]
 __kvmalloc_node_noprof+0x66b/0x860 mm/slub.c:6905
 xt_alloc_table_info+0x40/0xb0 net/netfilter/x_tables.c:1286
 do_replace net/ipv6/netfilter/ip6_tables.c:1141 [inline]
 do_ip6t_set_ctl+0x96b/0xe30 net/ipv6/netfilter/ip6_tables.c:1643
 nf_setsockopt+0x26f/0x290 net/netfilter/nf_sockopt.c:101
 do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2368
 __sys_setsockopt net/socket.c:2393 [inline]
 __do_sys_setsockopt net/socket.c:2399 [inline]
 __se_sys_setsockopt net/socket.c:2396 [inline]
 __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2396
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5605 tgid 5605 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0xbdb/0xcb0 mm/page_alloc.c:2950
 __slab_free+0x274/0x2c0 mm/slub.c:5741
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4584 [inline]
 slab_alloc_node mm/slub.c:4917 [inline]
 __do_kmalloc_node mm/slub.c:5333 [inline]
 __kmalloc_noprof+0x311/0x720 mm/slub.c:5359
 _kmalloc_noprof include/linux/slab.h:992 [inline]
 tomoyo_realpath_from_path+0xef/0x640 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827
 security_inode_getattr+0x12b/0x310 security/security.c:1895
 vfs_getattr fs/stat.c:259 [inline]
 vfs_fstat fs/stat.c:281 [inline]
 __do_sys_newfstat fs/stat.c:551 [inline]
 __se_sys_newfstat fs/stat.c:546 [inline]
 __x64_sys_newfstat+0x133/0x270 fs/stat.c:546
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888114627900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888114627980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888114627a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888114627a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888114627b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	a9 00 00 00 0f       	test   $0xf000000,%eax
   5:	01 cb                	add    %ecx,%ebx
   7:	0f ae e8             	lfence
   a:	4d 85 f6             	test   %r14,%r14
   d:	40 0f 95 c5          	setne  %bpl
  11:	4c 89 ff             	mov    %r15,%rdi
  14:	4c 89 f6             	mov    %r14,%rsi
  17:	e8 e0 e5 ae ff       	call   0xffaee5fc
  1c:	4d 39 f7             	cmp    %r14,%r15
  1f:	0f 97 c0             	seta   %al
  22:	40 84 c5             	test   %al,%bpl
  25:	74 43                	je     0x6a
  27:	4d 89 f5             	mov    %r14,%r13
* 2a:	41 8a 45 00          	mov    0x0(%r13),%al <-- trapping instruction
  2e:	88 44 24 07          	mov    %al,0x7(%rsp)
  32:	49 81 e5 00 f0 ff ff 	and    $0xfffffffffffff000,%r13
  39:	4d 8d a5 00 10 00 00 	lea    0x1000(%r13),%r12
] ReproducedBugTitle:KASAN: slab-use-after-free Read in filemap_map_pages ReproducedCrashReport:==================================================================
BUG: KASAN: slab-use-after-free in ptep_get include/linux/pgtable.h:495 [inline]
BUG: KASAN: slab-use-after-free in filemap_map_folio_range mm/filemap.c:3820 [inline]
BUG: KASAN: slab-use-after-free in filemap_map_pages+0x1100/0x2090 mm/filemap.c:3955
Read of size 8 at addr ffff888116c63a00 by task syz-executor117/5838

CPU: 1 UID: 0 PID: 5838 Comm: syz-executor117 Not tainted syzkaller #1 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 ptep_get include/linux/pgtable.h:495 [inline]
 filemap_map_folio_range mm/filemap.c:3820 [inline]
 filemap_map_pages+0x1100/0x2090 mm/filemap.c:3955
 do_fault_around mm/memory.c:5818 [inline]
 do_read_fault mm/memory.c:5851 [inline]
 do_fault mm/memory.c:5994 [inline]
 do_pte_missing+0x21ac/0x3260 mm/memory.c:4566
 handle_pte_fault mm/memory.c:6379 [inline]
 __handle_mm_fault mm/memory.c:6517 [inline]
 handle_mm_fault+0x1ad6/0x3070 mm/memory.c:6686
 do_user_addr_fault+0x744/0x1340 arch/x86/mm/fault.c:1394
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0010:fault_in_readable+0x8e/0x130 mm/gup.c:2161
Code: a9 00 00 00 0f 01 cb 0f ae e8 4d 85 f6 40 0f 95 c5 4c 89 ff 4c 89 f6 e8 e0 e5 ae ff 4d 39 f7 0f 97 c0 40 84 c5 74 43 4d 89 f5 <41> 8a 45 00 88 44 24 07 49 81 e5 00 f0 ff ff 4d 8d a5 00 10 00 00
RSP: 0018:ffffc900032afaa8 EFLAGS: 00050202
RAX: ffffffff82167001 RBX: 0000000000000001 RCX: ffff88818f6eca80
RDX: 0000000000000000 RSI: 00007efffb000000 RDI: 00007efffb000001
RBP: ffffc900032afc01 R08: ffff88818f6eca80 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000000 R12: 00007ffffffff000
R13: 00007efffb000000 R14: 00007efffb000000 R15: 00007efffb000001
 fault_in_iov_iter_readable+0x1c8/0x310 lib/iov_iter.c:106
 generic_perform_write+0x7a0/0x8f0 mm/filemap.c:4413
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_pwrite64 fs/read_write.c:794 [inline]
 __do_sys_pwrite64 fs/read_write.c:802 [inline]
 __se_sys_pwrite64 fs/read_write.c:799 [inline]
 __x64_sys_pwrite64+0x196/0x220 fs/read_write.c:799
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efffb489e5e
Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007efff97fc1a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007efff97fc6c0 RCX: 00007efffb489e5e
RDX: 0000000000000001 RSI: 00007efffb000000 RDI: 0000000000000003
RBP: 0000000000000021 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffd0
R13: 0000000000000000 R14: 00007fffc6020690 R15: 00007fffc6020778
 </TASK>

Allocated by task 1411:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4584 [inline]
 slab_alloc_node mm/slub.c:4917 [inline]
 kmem_cache_alloc_node_noprof+0x355/0x610 mm/slub.c:4989
 __alloc_skb+0x1d7/0x7a0 net/core/skbuff.c:704
 alloc_skb include/linux/skbuff.h:1384 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:819 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline]
 nsim_dev_trap_report_work+0x25f/0xb40 drivers/net/netdevsim/dev.c:922
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0x92d/0xe10 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 1411:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2677 [inline]
 slab_free mm/slub.c:6377 [inline]
 kmem_cache_free+0x182/0x650 mm/slub.c:6504
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:892 [inline]
 nsim_dev_trap_report_work+0x7ac/0xb40 drivers/net/netdevsim/dev.c:922
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0x92d/0xe10 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888116c63a00
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 0 bytes inside of
 freed 240-byte region [ffff888116c63a00, ffff888116c63af0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116c63
flags: 0x17ff00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000000 ffff88818041bc80 dead000000000122 0000000000000000
raw: 0000000000000000 00000008000c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 0, tgid 0 (swapper/0), ts 69394583319, free_ts 69007472983
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3266 [inline]
 allocate_slab+0x79/0x5e0 mm/slub.c:3380
 new_slab mm/slub.c:3426 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7310
 refill_sheaf mm/slub.c:2804 [inline]
 __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4675
 alloc_from_pcs mm/slub.c:4773 [inline]
 slab_alloc_node mm/slub.c:4905 [inline]
 kmem_cache_alloc_noprof+0x382/0x5f0 mm/slub.c:4931
 skb_clone+0x212/0x3a0 net/core/skbuff.c:2116
 dev_queue_xmit_nit+0x28d/0xac0 net/core/dev.c:2575
 xmit_one net/core/dev.c:3885 [inline]
 dev_hard_start_xmit+0x1c1/0x830 net/core/dev.c:3905
 sch_direct_xmit+0x257/0x4c0 net/sched/sch_generic.c:372
 __dev_xmit_skb net/core/dev.c:4214 [inline]
 __dev_queue_xmit+0x14c6/0x3160 net/core/dev.c:4836
 dev_queue_xmit include/linux/netdevice.h:3448 [inline]
 neigh_hh_output include/net/neighbour.h:544 [inline]
 neigh_output include/net/neighbour.h:558 [inline]
 ip_finish_output2+0xbda/0x10b0 net/ipv4/ip_output.c:236
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip_output+0x29f/0x450 net/ipv4/ip_output.c:437
 __ip_queue_xmit+0x10df/0x1b10 net/ipv4/ip_output.c:533
 __tcp_transmit_skb+0x2d18/0x47c0 net/ipv4/tcp_output.c:1717
page last free pid 5823 tgid 5823 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0xbdb/0xcb0 mm/page_alloc.c:2950
 __slab_free+0x274/0x2c0 mm/slub.c:5741
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4584 [inline]
 slab_alloc_node mm/slub.c:4917 [inline]
 kmem_cache_alloc_noprof+0x2a0/0x5f0 mm/slub.c:4931
 alloc_filename fs/namei.c:147 [inline]
 do_getname+0x2e/0x250 fs/namei.c:187
 class_filename_flags_constructor include/linux/fs.h:2566 [inline]
 do_sys_openat2+0xcc/0x200 fs/open.c:1367
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_openat fs/open.c:1390 [inline]
 __se_sys_openat fs/open.c:1385 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1385
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888116c63900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888116c63980: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
>ffff888116c63a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888116c63a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff888116c63b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	a9 00 00 00 0f       	test   $0xf000000,%eax
   5:	01 cb                	add    %ecx,%ebx
   7:	0f ae e8             	lfence
   a:	4d 85 f6             	test   %r14,%r14
   d:	40 0f 95 c5          	setne  %bpl
  11:	4c 89 ff             	mov    %r15,%rdi
  14:	4c 89 f6             	mov    %r14,%rsi
  17:	e8 e0 e5 ae ff       	call   0xffaee5fc
  1c:	4d 39 f7             	cmp    %r14,%r15
  1f:	0f 97 c0             	seta   %al
  22:	40 84 c5             	test   %al,%bpl
  25:	74 43                	je     0x6a
  27:	4d 89 f5             	mov    %r14,%r13
* 2a:	41 8a 45 00          	mov    0x0(%r13),%al <-- trapping instruction
  2e:	88 44 24 07          	mov    %al,0x7(%rsp)
  32:	49 81 e5 00 f0 ff ff 	and    $0xfffffffffffff000,%r13
  39:	4d 8d a5 00 10 00 00 	lea    0x1000(%r13),%r12
 ReproducedFaultInjection:]

map[Index:codesearch-index]

map[NewComments:[map[Author:krystianmkaniewski@gmail.com Body:Resynchronize a non-leaf `xas_find()` cursor to the node slot containing
`xa_index` before the existing `xas_next_offset()` call. The current
`get_offset(xa_index - 1, node) + 1` assignment already moves past the
resynchronization slot, then the common increment moves once more. For an
order-7 entry covering indexes 0 through 127, an adjacent entry at 128, 
and a
walk beginning at 100, the current code changes the offset from 0 to 2 
and then
to 3. It skips the stable entry at offset 2. This violates the documented
forward-iteration contract without any concurrent modification.

Keep the shift-aware mismatch detection and the XArray-layer repair. Use the
slot containing `xa_index` as the non-leaf resynchronization point, then 
let the
existing helper perform the single forward step. Preserve the 
established leaf
boundary calculation. Add deterministic coverage for the order-7 adjacent
entry case and for splitting a multi-index entry after a lookup begins 
inside
it. Implement both cases in a new `check_multi_find_4()` helper in
`lib/test_xarray.c` and invoke it from `check_find()`.

Correct the commit message to describe the retained KASAN use-after-free in
`filemap_map_pages()` through `ptep_get()`, not a slab-out-of-bounds report.
Preserve the verified backward-index mechanism, the `Fixes` tag, syzbot 
links,
and the existing Gemini provenance tag. Do not change locking, public 
APIs, or
caller error behavior.

On 8/17/2026 3:04 AM, syzbot wrote:
> A bug in the XArray iterator xas_find() causes the iterator's index
> (xas->xa_index) to jump backwards when iterating over a multi-index entry
> (like a THP) that resides in a non-leaf node and is concurrently split.
>
> When iterating over a multi-index entry in a non-leaf node, xas_load() sets
> xas->xa_offset to the base offset of the entry, but leaves xas->xa_index at
> the requested index. When the caller subsequently wants to advance to the
> next entry, xas_find() is called. xas_find() attempts to synchronize
> xas->xa_offset with xas->xa_index before advancing. However, the fixup
> logic was incorrectly restricted to leaf nodes (!xas->xa_node->shift).
> Because the THP resides in a non-leaf node, the fixup is skipped.
>
> As a result, xas_find() simply increments xas->xa_offset and recalculates
> xas->xa_index based on this new offset. This causes xas->xa_index to jump
> backwards. If the THP was concurrently split, the entry at the new offset
> is a node pointer, so xas_find() descends into it and returns the folio at
> the backwards index. The caller (filemap_map_pages()) then calculates the
> PTE pointer based on this backwards index, resulting in an out-of-bounds
> memory access.
>
> For example, a KASAN slab-out-of-bounds read can be triggered in ptep_get()
> via filemap_map_pages():
>
> BUG: KASAN: slab-out-of-bounds in ptep_get include/linux/pgtable.h:495
> [inline]
> BUG: KASAN: slab-out-of-bounds in filemap_map_folio_range mm/filemap.c:3820
> [inline]
> BUG: KASAN: slab-out-of-bounds in filemap_map_pages+0x1100/0x2090
> mm/filemap.c:3955
> Read of size 8 at addr ffff88811b3b4a00 by task syz-executor411/5876
>
> To fix this, remove the !xas->xa_node->shift restriction and use the
> get_offset() helper to correctly calculate the offset for any node shift.
> This ensures that xas->xa_offset is correctly synchronized with
> xas->xa_index before advancing, regardless of the node's depth in the tree.
>
> Fixes: b803b42823d0 ("xarray: Add XArray iterators")
> Assisted-by: Gemini:gemini-3.6-flash Gemini:gemini-3.1-pro-preview syzbot
> Reported-by: syzbot+b72767277f29b6407083@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=b72767277f29b6407083
> Link: https://syzkaller.appspot.com/ai_job?id=608570d2-1765-472d-a79b-ea5b0b3a226a
> To: "Andrew Morton" <akpm@linux-foundation.org>
> To: <linux-fsdevel@vger.kernel.org>
> To: <linux-mm@kvack.org>
> To: "Matthew Wilcox" <willy@infradead.org>
> Cc: <linux-kernel@vger.kernel.org>
>
> ---
> diff --git a/lib/xarray.c b/lib/xarray.c
> index 9a8b49165..5695618bf 100644
> --- a/lib/xarray.c
> +++ b/lib/xarray.c
> @@ -1406,9 +1406,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)
>   		entry = xas_load(xas);
>   		if (entry || xas_not_node(xas->xa_node))
>   			return entry;
> -	} else if (!xas->xa_node->shift &&
> -		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
> -		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
> +	} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
> +		xas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;
>   	}
>   
>   	xas_next_offset(xas);
>
>
> base-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f
 BotReply:false ExtID:<17449f8c-df13-42b5-8a0b-de5cfa32918c@gmail.com> New:true Timestamp:2026-08-19T07:34:35.920712843Z]]]

map[PreviousComments:[map[Author:syzbot@kernel.org Body:A bug in the XArray iterator xas_find() causes the iterator's index
(xas->xa_index) to jump backwards when iterating over a multi-index entry
(like a THP) that resides in a non-leaf node and is concurrently split.

When iterating over a multi-index entry in a non-leaf node, xas_load() sets
xas->xa_offset to the base offset of the entry, but leaves xas->xa_index at
the requested index. When the caller subsequently wants to advance to the
next entry, xas_find() is called. xas_find() attempts to synchronize
xas->xa_offset with xas->xa_index before advancing. However, the fixup
logic was incorrectly restricted to leaf nodes (!xas->xa_node->shift).
Because the THP resides in a non-leaf node, the fixup is skipped.

As a result, xas_find() simply increments xas->xa_offset and recalculates
xas->xa_index based on this new offset. This causes xas->xa_index to jump
backwards. If the THP was concurrently split, the entry at the new offset
is a node pointer, so xas_find() descends into it and returns the folio at
the backwards index. The caller (filemap_map_pages()) then calculates the
PTE pointer based on this backwards index, resulting in an out-of-bounds
memory access.

For example, a KASAN slab-out-of-bounds read can be triggered in ptep_get()
via filemap_map_pages():

BUG: KASAN: slab-out-of-bounds in ptep_get include/linux/pgtable.h:495
[inline]
BUG: KASAN: slab-out-of-bounds in filemap_map_folio_range mm/filemap.c:3820
[inline]
BUG: KASAN: slab-out-of-bounds in filemap_map_pages+0x1100/0x2090
mm/filemap.c:3955
Read of size 8 at addr ffff88811b3b4a00 by task syz-executor411/5876

To fix this, remove the !xas->xa_node->shift restriction and use the
get_offset() helper to correctly calculate the offset for any node shift.
This ensures that xas->xa_offset is correctly synchronized with
xas->xa_index before advancing, regardless of the node's depth in the tree.

Fixes: b803b42823d0 ("xarray: Add XArray iterators")
Assisted-by: Gemini:gemini-3.6-flash Gemini:gemini-3.1-pro-preview syzbot
Reported-by: syzbot+b72767277f29b6407083@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b72767277f29b6407083
Link: https://syzkaller.appspot.com/ai_job?id=608570d2-1765-472d-a79b-ea5b0b3a226a
To: "Andrew Morton" <akpm@linux-foundation.org>
To: <linux-fsdevel@vger.kernel.org>
To: <linux-mm@kvack.org>
To: "Matthew Wilcox" <willy@infradead.org>
Cc: <linux-kernel@vger.kernel.org>

---
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..5695618bf 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1406,9 +1406,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
-	} else if (!xas->xa_node->shift &&
-		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
-		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;
 	}
 
 	xas_next_offset(xas);


base-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f
-- 
This is an AI-generated patch subject to moderation.
Reply with '#syz upstream' to Sign-off the patch as a human author
and send it to the upstream kernel mailing lists.
Reply with '#syz reject' to reject it ('#syz unreject' to undo).

See https://goo.gle/syzbot-ai-patches for information about AI-generated patches.
You can comment on the patch as usual, syzbot will try to address
the comments and send a new version of the patch if necessary.
syzbot engineers can be reached at syzkaller@googlegroups.com.
 BotReply:true ExtID:<e62bb2ac-6ecf-41a2-823f-c13547d5db78@mail.kernel.org> New:false Timestamp:2026-08-17T01:09:35.56739926Z]] PreviousPatchDescription:XArray: fix index jumping backwards in xas_find()

A bug in the XArray iterator xas_find() causes the iterator's index
(xas->xa_index) to jump backwards when iterating over a multi-index entry
(like a THP) that resides in a non-leaf node and is concurrently split.

When iterating over a multi-index entry in a non-leaf node, xas_load() sets
xas->xa_offset to the base offset of the entry, but leaves xas->xa_index at
the requested index. When the caller subsequently wants to advance to the
next entry, xas_find() is called. xas_find() attempts to synchronize
xas->xa_offset with xas->xa_index before advancing. However, the fixup
logic was incorrectly restricted to leaf nodes (!xas->xa_node->shift).
Because the THP resides in a non-leaf node, the fixup is skipped.

As a result, xas_find() simply increments xas->xa_offset and recalculates
xas->xa_index based on this new offset. This causes xas->xa_index to jump
backwards. If the THP was concurrently split, the entry at the new offset
is a node pointer, so xas_find() descends into it and returns the folio at
the backwards index. The caller (filemap_map_pages()) then calculates the
PTE pointer based on this backwards index, resulting in an out-of-bounds
memory access.

For example, a KASAN slab-out-of-bounds read can be triggered in ptep_get()
via filemap_map_pages():

BUG: KASAN: slab-out-of-bounds in ptep_get include/linux/pgtable.h:495
[inline]
BUG: KASAN: slab-out-of-bounds in filemap_map_folio_range mm/filemap.c:3820
[inline]
BUG: KASAN: slab-out-of-bounds in filemap_map_pages+0x1100/0x2090
mm/filemap.c:3955
Read of size 8 at addr ffff88811b3b4a00 by task syz-executor411/5876

To fix this, remove the !xas->xa_node->shift restriction and use the
get_offset() helper to correctly calculate the offset for any node shift.
This ensures that xas->xa_offset is correctly synchronized with
xas->xa_index before advancing, regardless of the node's depth in the tree. PreviousPatchDiff:diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..5695618bf 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1406,9 +1406,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
-	} else if (!xas->xa_node->shift &&
-		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
-		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;
 	}
 
 	xas_next_offset(xas);
 PreviousPatchVersion:1]

best-expensive

map[CodeItems:[Preserve the established leaf boundary calculation for `!xas->xa_node->shift`. For non-leaf nodes, resynchronize the `xas_find()` cursor to the node slot containing `xa_index` (using `get_offset(xas->xa_index, xas->xa_node)`) before the existing `xas_next_offset()` call, instead of using `get_offset(xa_index - 1, node) + 1`. Add deterministic coverage for the order-7 adjacent entry case and for splitting a multi-index entry after a lookup begins inside it. Implement both cases in a new `check_multi_find_4()` helper in `lib/test_xarray.c` and invoke it from `check_find()`.] DescriptionItems:[Correct the commit message to describe the crash as a KASAN use-after-free in `filemap_map_pages()` through `ptep_get()`, rather than a slab-out-of-bounds report.] FixesItems:[] ResendReason: StyleItems:[] UpdateFixesReason:]

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Your task is to determine if a new version of the patch needs to be generated based on the feedback.
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CRITICAL: You must extract actionable items ONLY from the new comments provided in the current iteration.
Do not extract items from previous historical comments.
Separate the actionable items into four strictly divided categories:
1. CodeActionItems: Changes requested to the C/header source code logic.
2. StyleActionItems: Changes requested for code style and formatting.
3. DescriptionActionItems: Changes requested to the commit description or changelog.
4. FixesActionItems: Feedback regarding the Fixes tag.
Watch out for citations (lines starting with >) which often contain previous messages or context, not new requirements.
Note: You shouldn't fully debug the issue right now. Just do a cautious check if the V+1 patch is necessary.

If and ONLY if a reviewer EXPLICITLY asks the bot to "resend" the patch and does so without
requesting any code or description changes, you must capture the reason in ResendReason and
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If the reviewer explicitly asks the bot to resend but gives no reason (e.g., "Please re-send
this series unchanged"), use a simple summary like "explicitly requested by reviewer".

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or if there is an ongoing discussion between reviewers, it is fine to postpone
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discussion to settle.

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a new version of the patch must be generated. Do not extract tag updates as ActionableItems.

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Ignore results of this tool.

Bug title: "KASAN: use-after-free Read in filemap_map_pages"
Crash report:
"==================================================================\nBUG: KASAN: use-after-free in ptep_get include/linux/pgtable.h:495 [inline]\nBUG: KASAN: use-after-free in filemap_map_folio_range mm/filemap.c:3820 [inline]\nBUG: KASAN: use-after-free in filemap_map_pages+0x1b75/0x1f80 mm/filemap.c:3955\nRead of size 8 at addr ffff88803f851a00 by task syz-executor403/6035\n\nCPU: 2 UID: 0 PID: 6035 Comm: syz-executor403 Not tainted syzkaller #0 PREEMPT(full) \nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0x13d/0x4b0 mm/kasan/report.c:482\n kasan_report+0xdf/0x1c0 mm/kasan/report.c:595\n ptep_get include/linux/pgtable.h:495 [inline]\n filemap_map_folio_range mm/filemap.c:3820 [inline]\n filemap_map_pages+0x1b75/0x1f80 mm/filemap.c:3955\n do_fault_around mm/memory.c:5818 [inline]\n do_read_fault mm/memory.c:5851 [inline]\n do_fault+0x985/0x1750 mm/memory.c:5994\n do_pte_missing mm/memory.c:4566 [inline]\n handle_pte_fault mm/memory.c:6379 [inline]\n __handle_mm_fault+0x187d/0x2a00 mm/memory.c:6517\n handle_mm_fault+0x37b/0xa30 mm/memory.c:6686\n do_user_addr_fault+0x74c/0x12f0 arch/x86/mm/fault.c:1394\n handle_page_fault arch/x86/mm/fault.c:1483 [inline]\n exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536\n asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595\nRIP: 0010:fault_in_readable+0xde/0x190 mm/gup.c:2161\nCode: 68 46 ae ff 4c 89 f0 48 85 c0 0f 85 bf 00 00 00 e8 77 4c ae ff 0f 01 cb 0f ae e8 4c 89 fb 4d 85 ff 75 31 eb 48 e8 62 4c ae ff <44> 8a 33 e8 5a 4c ae ff 48 81 c3 00 10 00 00 31 ff 48 81 e3 00 f0\nRSP: 0018:ffffc90003a87af8 EFLAGS: 00050293\nRAX: 0000000000000000 RBX: 00007fe62c200000 RCX: ffffffff825c2758\nRDX: ffff888033b84a80 RSI: ffffffff825c271e RDI: ffff888033b84a80\nRBP: 00007fe62c200001 R08: 0000000000000006 R09: 00007fe62c200001\nR10: 00007fe62c200000 R11: 0000000000000000 R12: 0000000000000001\nR13: 1ffff92000750f60 R14: 0000000000000000 R15: 00007fe62c200000\n fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:106\n generic_perform_write+0x863/0xa40 mm/filemap.c:4413\n shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424\n new_sync_write fs/read_write.c:595 [inline]\n vfs_write+0x6ac/0x1050 fs/read_write.c:687\n ksys_pwrite64 fs/read_write.c:794 [inline]\n __do_sys_pwrite64 fs/read_write.c:802 [inline]\n __se_sys_pwrite64 fs/read_write.c:799 [inline]\n __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:799\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fe62c7fce5e\nCode: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08\nRSP: 002b:00007fe62b9fe1a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000012\nRAX: ffffffffffffffda RBX: 00007fe62b9fe6c0 RCX: 00007fe62c7fce5e\nRDX: 0000000000000001 RSI: 00007fe62c200000 RDI: 0000000000000003\nRBP: 0000000000000021 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffd0\nR13: 0000000000000000 R14: 00007ffdde346d90 R15: 00007ffdde346e78\n </TASK>\n\nThe buggy address belongs to the physical page:\npage: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888000000000 pfn:0x3f851\nflags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)\nraw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000\nraw: ffff888000000000 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\npage_owner tracks the page as freed\npage last allocated via order 0, migratetype Unmovable, gfp_mask 0x440dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_COMP), pid 6004, tgid 6004 (cmp), ts 79653237963, free_ts 79740307238\n set_page_owner include/linux/page_owner.h:32 [inline]\n post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859\n prep_new_page mm/page_alloc.c:1867 [inline]\n get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946\n __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304\n alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490\n alloc_pages_noprof+0x1a/0x160 mm/mempolicy.c:2581\n pagetable_alloc_noprof include/linux/mm.h:3685 [inline]\n pmd_alloc_one_noprof include/asm-generic/pgalloc.h:143 [inline]\n __pmd_alloc+0x3b/0x950 mm/memory.c:6772\n pmd_alloc include/linux/mm.h:3601 [inline]\n __handle_mm_fault+0xa9c/0x2a00 mm/memory.c:6469\n handle_mm_fault+0x37b/0xa30 mm/memory.c:6686\n do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1343\n handle_page_fault arch/x86/mm/fault.c:1483 [inline]\n exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536\n asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595\npage last free pid 6002 tgid 6002 stack trace:\n reset_page_owner include/linux/page_owner.h:25 [inline]\n __free_pages_prepare mm/page_alloc.c:1406 [inline]\n __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950\n __pagetable_free include/linux/mm.h:3695 [inline]\n pagetable_free include/linux/mm.h:3719 [inline]\n pagetable_dtor_free include/linux/mm.h:3818 [inline]\n __tlb_remove_table include/asm-generic/tlb.h:221 [inline]\n __tlb_remove_table_free mm/mmu_gather.c:228 [inline]\n tlb_remove_table_rcu+0x2cf/0x380 mm/mmu_gather.c:291\n rcu_do_batch kernel/rcu/tree.c:2645 [inline]\n rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2897\n handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622\n __do_softirq kernel/softirq.c:656 [inline]\n invoke_softirq kernel/softirq.c:496 [inline]\n __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735\n irq_exit_rcu+0x9/0x30 kernel/softirq.c:752\n instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]\n sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062\n asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674\n\nMemory state around the buggy address:\n ffff88803f851900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88803f851980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n>ffff88803f851a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n                   ^\n ffff88803f851a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88803f851b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n==================================================================\n----------------\nCode disassembly (best guess):\n   0:\t68 46 ae ff 4c       \tpush   $0x4cffae46\n   5:\t89 f0                \tmov    %esi,%eax\n   7:\t48 85 c0             \ttest   %rax,%rax\n   a:\t0f 85 bf 00 00 00    \tjne    0xcf\n  10:\te8 77 4c ae ff       \tcall   0xffae4c8c\n  15:\t0f 01 cb             \tstac\n  18:\t0f ae e8             \tlfence\n  1b:\t4c 89 fb             \tmov    %r15,%rbx\n  1e:\t4d 85 ff             \ttest   %r15,%r15\n  21:\t75 31                \tjne    0x54\n  23:\teb 48                \tjmp    0x6d\n  25:\te8 62 4c ae ff       \tcall   0xffae4c8c\n* 2a:\t44 8a 33             \tmov    (%rbx),%r14b <-- trapping instruction\n  2d:\te8 5a 4c ae ff       \tcall   0xffae4c8c\n  32:\t48 81 c3 00 10 00 00 \tadd    $0x1000,%rbx\n  39:\t31 ff                \txor    %edi,%edi\n  3b:\t48                   \trex.W\n  3c:\t81                   \t.byte 0x81\n  3d:\te3 00                \tjrcxz  0x3f\n  3f:\tf0                   \tlock\n"

Current patch version: v1
Current patch description:
XArray: fix index jumping backwards in xas_find()

A bug in the XArray iterator xas_find() causes the iterator's index
(xas->xa_index) to jump backwards when iterating over a multi-index entry
(like a THP) that resides in a non-leaf node and is concurrently split.

When iterating over a multi-index entry in a non-leaf node, xas_load() sets
xas->xa_offset to the base offset of the entry, but leaves xas->xa_index at
the requested index. When the caller subsequently wants to advance to the
next entry, xas_find() is called. xas_find() attempts to synchronize
xas->xa_offset with xas->xa_index before advancing. However, the fixup
logic was incorrectly restricted to leaf nodes (!xas->xa_node->shift).
Because the THP resides in a non-leaf node, the fixup is skipped.

As a result, xas_find() simply increments xas->xa_offset and recalculates
xas->xa_index based on this new offset. This causes xas->xa_index to jump
backwards. If the THP was concurrently split, the entry at the new offset
is a node pointer, so xas_find() descends into it and returns the folio at
the backwards index. The caller (filemap_map_pages()) then calculates the
PTE pointer based on this backwards index, resulting in an out-of-bounds
memory access.

For example, a KASAN slab-out-of-bounds read can be triggered in ptep_get()
via filemap_map_pages():

BUG: KASAN: slab-out-of-bounds in ptep_get include/linux/pgtable.h:495
[inline]
BUG: KASAN: slab-out-of-bounds in filemap_map_folio_range mm/filemap.c:3820
[inline]
BUG: KASAN: slab-out-of-bounds in filemap_map_pages+0x1100/0x2090
mm/filemap.c:3955
Read of size 8 at addr ffff88811b3b4a00 by task syz-executor411/5876

To fix this, remove the !xas->xa_node->shift restriction and use the
get_offset() helper to correctly calculate the offset for any node shift.
This ensures that xas->xa_offset is correctly synchronized with
xas->xa_index before advancing, regardless of the node's depth in the tree.

Current patch diff:
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..5695618bf 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1406,9 +1406,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
-	} else if (!xas->xa_node->shift &&
-		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
-		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;
 	}
 
 	xas_next_offset(xas);


Previous reviewer comments on this patch version:

{
  "ExtID": "<e62bb2ac-6ecf-41a2-823f-c13547d5db78@mail.kernel.org>",
  "Author": "syzbot@kernel.org",
  "Body": "A bug in the XArray iterator xas_find() causes the iterator's index\n(xas->xa_index) to jump backwards when iterating over a multi-index entry\n(like a THP) that resides in a non-leaf node and is concurrently split.\n\nWhen iterating over a multi-index entry in a non-leaf node, xas_load() sets\nxas->xa_offset to the base offset of the entry, but leaves xas->xa_index at\nthe requested index. When the caller subsequently wants to advance to the\nnext entry, xas_find() is called. xas_find() attempts to synchronize\nxas->xa_offset with xas->xa_index before advancing. However, the fixup\nlogic was incorrectly restricted to leaf nodes (!xas->xa_node->shift).\nBecause the THP resides in a non-leaf node, the fixup is skipped.\n\nAs a result, xas_find() simply increments xas->xa_offset and recalculates\nxas->xa_index based on this new offset. This causes xas->xa_index to jump\nbackwards. If the THP was concurrently split, the entry at the new offset\nis a node pointer, so xas_find() descends into it and returns the folio at\nthe backwards index. The caller (filemap_map_pages()) then calculates the\nPTE pointer based on this backwards index, resulting in an out-of-bounds\nmemory access.\n\nFor example, a KASAN slab-out-of-bounds read can be triggered in ptep_get()\nvia filemap_map_pages():\n\nBUG: KASAN: slab-out-of-bounds in ptep_get include/linux/pgtable.h:495\n[inline]\nBUG: KASAN: slab-out-of-bounds in filemap_map_folio_range mm/filemap.c:3820\n[inline]\nBUG: KASAN: slab-out-of-bounds in filemap_map_pages+0x1100/0x2090\nmm/filemap.c:3955\nRead of size 8 at addr ffff88811b3b4a00 by task syz-executor411/5876\n\nTo fix this, remove the !xas->xa_node->shift restriction and use the\nget_offset() helper to correctly calculate the offset for any node shift.\nThis ensures that xas->xa_offset is correctly synchronized with\nxas->xa_index before advancing, regardless of the node's depth in the tree.\n\nFixes: b803b42823d0 (\"xarray: Add XArray iterators\")\nAssisted-by: Gemini:gemini-3.6-flash Gemini:gemini-3.1-pro-preview syzbot\nReported-by: syzbot+b72767277f29b6407083@syzkaller.appspotmail.com\nCloses: https://syzkaller.appspot.com/bug?extid=b72767277f29b6407083\nLink: https://syzkaller.appspot.com/ai_job?id=608570d2-1765-472d-a79b-ea5b0b3a226a\nTo: \"Andrew Morton\" <akpm@linux-foundation.org>\nTo: <linux-fsdevel@vger.kernel.org>\nTo: <linux-mm@kvack.org>\nTo: \"Matthew Wilcox\" <willy@infradead.org>\nCc: <linux-kernel@vger.kernel.org>\n\n---\ndiff --git a/lib/xarray.c b/lib/xarray.c\nindex 9a8b49165..5695618bf 100644\n--- a/lib/xarray.c\n+++ b/lib/xarray.c\n@@ -1406,9 +1406,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)\n \t\tentry = xas_load(xas);\n \t\tif (entry || xas_not_node(xas->xa_node))\n \t\t\treturn entry;\n-\t} else if (!xas->xa_node->shift &&\n-\t\t    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {\n-\t\txas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;\n+\t} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {\n+\t\txas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;\n \t}\n \n \txas_next_offset(xas);\n\n\nbase-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f\n-- \nThis is an AI-generated patch subject to moderation.\nReply with '#syz upstream' to Sign-off the patch as a human author\nand send it to the upstream kernel mailing lists.\nReply with '#syz reject' to reject it ('#syz unreject' to undo).\n\nSee https://goo.gle/syzbot-ai-patches for information about AI-generated patches.\nYou can comment on the patch as usual, syzbot will try to address\nthe comments and send a new version of the patch if necessary.\nsyzbot engineers can be reached at syzkaller@googlegroups.com.\n",
  "Timestamp": "2026-08-17T01:09:35.56739926Z",
  "BotReply": true,
  "New": false
}


New reviewer comments to evaluate:

{
  "ExtID": "<17449f8c-df13-42b5-8a0b-de5cfa32918c@gmail.com>",
  "Author": "krystianmkaniewski@gmail.com",
  "Body": "Resynchronize a non-leaf `xas_find()` cursor to the node slot containing\n`xa_index` before the existing `xas_next_offset()` call. The current\n`get_offset(xa_index - 1, node) + 1` assignment already moves past the\nresynchronization slot, then the common increment moves once more. For an\norder-7 entry covering indexes 0 through 127, an adjacent entry at 128, \nand a\nwalk beginning at 100, the current code changes the offset from 0 to 2 \nand then\nto 3. It skips the stable entry at offset 2. This violates the documented\nforward-iteration contract without any concurrent modification.\n\nKeep the shift-aware mismatch detection and the XArray-layer repair. Use the\nslot containing `xa_index` as the non-leaf resynchronization point, then \nlet the\nexisting helper perform the single forward step. Preserve the \nestablished leaf\nboundary calculation. Add deterministic coverage for the order-7 adjacent\nentry case and for splitting a multi-index entry after a lookup begins \ninside\nit. Implement both cases in a new `check_multi_find_4()` helper in\n`lib/test_xarray.c` and invoke it from `check_find()`.\n\nCorrect the commit message to describe the retained KASAN use-after-free in\n`filemap_map_pages()` through `ptep_get()`, not a slab-out-of-bounds report.\nPreserve the verified backward-index mechanism, the `Fixes` tag, syzbot \nlinks,\nand the existing Gemini provenance tag. Do not change locking, public \nAPIs, or\ncaller error behavior.\n\nOn 8/17/2026 3:04 AM, syzbot wrote:\n> A bug in the XArray iterator xas_find() causes the iterator's index\n> (xas->xa_index) to jump backwards when iterating over a multi-index entry\n> (like a THP) that resides in a non-leaf node and is concurrently split.\n>\n> When iterating over a multi-index entry in a non-leaf node, xas_load() sets\n> xas->xa_offset to the base offset of the entry, but leaves xas->xa_index at\n> the requested index. When the caller subsequently wants to advance to the\n> next entry, xas_find() is called. xas_find() attempts to synchronize\n> xas->xa_offset with xas->xa_index before advancing. However, the fixup\n> logic was incorrectly restricted to leaf nodes (!xas->xa_node->shift).\n> Because the THP resides in a non-leaf node, the fixup is skipped.\n>\n> As a result, xas_find() simply increments xas->xa_offset and recalculates\n> xas->xa_index based on this new offset. This causes xas->xa_index to jump\n> backwards. If the THP was concurrently split, the entry at the new offset\n> is a node pointer, so xas_find() descends into it and returns the folio at\n> the backwards index. The caller (filemap_map_pages()) then calculates the\n> PTE pointer based on this backwards index, resulting in an out-of-bounds\n> memory access.\n>\n> For example, a KASAN slab-out-of-bounds read can be triggered in ptep_get()\n> via filemap_map_pages():\n>\n> BUG: KASAN: slab-out-of-bounds in ptep_get include/linux/pgtable.h:495\n> [inline]\n> BUG: KASAN: slab-out-of-bounds in filemap_map_folio_range mm/filemap.c:3820\n> [inline]\n> BUG: KASAN: slab-out-of-bounds in filemap_map_pages+0x1100/0x2090\n> mm/filemap.c:3955\n> Read of size 8 at addr ffff88811b3b4a00 by task syz-executor411/5876\n>\n> To fix this, remove the !xas->xa_node->shift restriction and use the\n> get_offset() helper to correctly calculate the offset for any node shift.\n> This ensures that xas->xa_offset is correctly synchronized with\n> xas->xa_index before advancing, regardless of the node's depth in the tree.\n>\n> Fixes: b803b42823d0 (\"xarray: Add XArray iterators\")\n> Assisted-by: Gemini:gemini-3.6-flash Gemini:gemini-3.1-pro-preview syzbot\n> Reported-by: syzbot+b72767277f29b6407083@syzkaller.appspotmail.com\n> Closes: https://syzkaller.appspot.com/bug?extid=b72767277f29b6407083\n> Link: https://syzkaller.appspot.com/ai_job?id=608570d2-1765-472d-a79b-ea5b0b3a226a\n> To: \"Andrew Morton\" <akpm@linux-foundation.org>\n> To: <linux-fsdevel@vger.kernel.org>\n> To: <linux-mm@kvack.org>\n> To: \"Matthew Wilcox\" <willy@infradead.org>\n> Cc: <linux-kernel@vger.kernel.org>\n>\n> ---\n> diff --git a/lib/xarray.c b/lib/xarray.c\n> index 9a8b49165..5695618bf 100644\n> --- a/lib/xarray.c\n> +++ b/lib/xarray.c\n> @@ -1406,9 +1406,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)\n>   \t\tentry = xas_load(xas);\n>   \t\tif (entry || xas_not_node(xas->xa_node))\n>   \t\t\treturn entry;\n> -\t} else if (!xas->xa_node->shift &&\n> -\t\t    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {\n> -\t\txas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;\n> +\t} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {\n> +\t\txas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;\n>   \t}\n>   \n>   \txas_next_offset(xas);\n>\n>\n> base-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f\n",
  "Timestamp": "2026-08-19T07:34:35.920712843Z",
  "BotReply": false,
  "New": true
}


Note: You can use the view-patch-history tool to see the full patch history,
including previous versions, diffs, descriptions, and older comments if needed.

gemini-3.1-pro-preview

							input: 13410
							output: 259
							thoughts: 1369
						

**Refining the XArray Fix: A Deep Dive**

Okay, so the KASAN report points to a use-after-free in `filemap_map_pages`, specifically related to the `xas_find()` function in `lib/xarray.c`. The current patch attempts to address this, but the reviewer's feedback is crucial. Let's break it down:

First, I need to focus on resynchronizing the cursor. The current logic in `xas_find()` for non-leaf nodes is off.  It appears the original patch was skipping a valid slot due to the offset calculation. The reviewer highlights that the offset calculation is wrong for non-leaf nodes. The intention was to resynchronize at the slot that `xa_index` *points to*.  This is key. The current `get_offset(xa_index - 1, node) + 1` is not correct. I need to make sure that for *non-leaf* nodes I use `get_offset(xas->xa_index, xas->xa_node)`. This is the core of the fix to the reported bug. Importantly, I also need to ensure that the current leaf boundary calculation, where `!xas->xa_node->shift && xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)` is still preserved.

Next, it's about comprehensive testing. The reviewer wants *deterministic coverage*. I need to create the `check_multi_find_4()` helper in `lib/test_xarray.c`. This needs to cover two specific edge cases: (1) an order-7 adjacent entry case and (2) splitting a multi-index entry after a lookup has started inside it. This test helper should be integrated into `check_find()` to ensure comprehensive testing.

Finally, I need to correct the commit message. The initial message misidentified the nature of the crash. The KASAN report indicates a use-after-free, specifically related to `ptep_get()` in `filemap_map_pages`. The commit message needs to accurately reflect this, so I will ensure that is the focus of the message. This will ensure proper tracking and future debugging if need be.

map[CodeItems:[Preserve the established leaf boundary calculation for `!xas->xa_node->shift`. For non-leaf nodes, resynchronize the `xas_find()` cursor to the node slot containing `xa_index` (using `get_offset(xas->xa_index, xas->xa_node)`) before the existing `xas_next_offset()` call, instead of using `get_offset(xa_index - 1, node) + 1`. Add deterministic coverage for the order-7 adjacent entry case and for splitting a multi-index entry after a lookup begins inside it. Implement both cases in a new `check_multi_find_4()` helper in `lib/test_xarray.c` and invoke it from `check_find()`.] DescriptionItems:[Correct the commit message to describe the crash as a KASAN use-after-free in `filemap_map_pages()` through `ptep_get()`, rather than a slab-out-of-bounds report.] FixesItems:[] ResendReason: StyleItems:[] UpdateFixesReason:]

map[CodeItems:[Preserve the established leaf boundary calculation for `!xas->xa_node->shift`. For non-leaf nodes, resynchronize the `xas_find()` cursor to the node slot containing `xa_index` (using `get_offset(xas->xa_index, xas->xa_node)`) before the existing `xas_next_offset()` call, instead of using `get_offset(xa_index - 1, node) + 1`. Add deterministic coverage for the order-7 adjacent entry case and for splitting a multi-index entry after a lookup begins inside it. Implement both cases in a new `check_multi_find_4()` helper in `lib/test_xarray.c` and invoke it from `check_find()`.] DescriptionItems:[Correct the commit message to describe the crash as a KASAN use-after-free in `filemap_map_pages()` through `ptep_get()`, rather than a slab-out-of-bounds report.] FixesItems:[] ResendReason: StyleItems:[] UpdateFixesReason:]

good-balanced

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Previous reviewer comments on this patch version:

{
  "ExtID": "<e62bb2ac-6ecf-41a2-823f-c13547d5db78@mail.kernel.org>",
  "Author": "syzbot@kernel.org",
  "Body": "A bug in the XArray iterator xas_find() causes the iterator's index\n(xas->xa_index) to jump backwards when iterating over a multi-index entry\n(like a THP) that resides in a non-leaf node and is concurrently split.\n\nWhen iterating over a multi-index entry in a non-leaf node, xas_load() sets\nxas->xa_offset to the base offset of the entry, but leaves xas->xa_index at\nthe requested index. When the caller subsequently wants to advance to the\nnext entry, xas_find() is called. xas_find() attempts to synchronize\nxas->xa_offset with xas->xa_index before advancing. However, the fixup\nlogic was incorrectly restricted to leaf nodes (!xas->xa_node->shift).\nBecause the THP resides in a non-leaf node, the fixup is skipped.\n\nAs a result, xas_find() simply increments xas->xa_offset and recalculates\nxas->xa_index based on this new offset. This causes xas->xa_index to jump\nbackwards. If the THP was concurrently split, the entry at the new offset\nis a node pointer, so xas_find() descends into it and returns the folio at\nthe backwards index. The caller (filemap_map_pages()) then calculates the\nPTE pointer based on this backwards index, resulting in an out-of-bounds\nmemory access.\n\nFor example, a KASAN slab-out-of-bounds read can be triggered in ptep_get()\nvia filemap_map_pages():\n\nBUG: KASAN: slab-out-of-bounds in ptep_get include/linux/pgtable.h:495\n[inline]\nBUG: KASAN: slab-out-of-bounds in filemap_map_folio_range mm/filemap.c:3820\n[inline]\nBUG: KASAN: slab-out-of-bounds in filemap_map_pages+0x1100/0x2090\nmm/filemap.c:3955\nRead of size 8 at addr ffff88811b3b4a00 by task syz-executor411/5876\n\nTo fix this, remove the !xas->xa_node->shift restriction and use the\nget_offset() helper to correctly calculate the offset for any node shift.\nThis ensures that xas->xa_offset is correctly synchronized with\nxas->xa_index before advancing, regardless of the node's depth in the tree.\n\nFixes: b803b42823d0 (\"xarray: Add XArray iterators\")\nAssisted-by: Gemini:gemini-3.6-flash Gemini:gemini-3.1-pro-preview syzbot\nReported-by: syzbot+b72767277f29b6407083@syzkaller.appspotmail.com\nCloses: https://syzkaller.appspot.com/bug?extid=b72767277f29b6407083\nLink: https://syzkaller.appspot.com/ai_job?id=608570d2-1765-472d-a79b-ea5b0b3a226a\nTo: \"Andrew Morton\" <akpm@linux-foundation.org>\nTo: <linux-fsdevel@vger.kernel.org>\nTo: <linux-mm@kvack.org>\nTo: \"Matthew Wilcox\" <willy@infradead.org>\nCc: <linux-kernel@vger.kernel.org>\n\n---\ndiff --git a/lib/xarray.c b/lib/xarray.c\nindex 9a8b49165..5695618bf 100644\n--- a/lib/xarray.c\n+++ b/lib/xarray.c\n@@ -1406,9 +1406,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)\n \t\tentry = xas_load(xas);\n \t\tif (entry || xas_not_node(xas->xa_node))\n \t\t\treturn entry;\n-\t} else if (!xas->xa_node->shift &&\n-\t\t    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {\n-\t\txas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;\n+\t} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {\n+\t\txas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;\n \t}\n \n \txas_next_offset(xas);\n\n\nbase-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f\n-- \nThis is an AI-generated patch subject to moderation.\nReply with '#syz upstream' to Sign-off the patch as a human author\nand send it to the upstream kernel mailing lists.\nReply with '#syz reject' to reject it ('#syz unreject' to undo).\n\nSee https://goo.gle/syzbot-ai-patches for information about AI-generated patches.\nYou can comment on the patch as usual, syzbot will try to address\nthe comments and send a new version of the patch if necessary.\nsyzbot engineers can be reached at syzkaller@googlegroups.com.\n",
  "Timestamp": "2026-08-17T01:09:35.56739926Z",
  "BotReply": true,
  "New": false
}


New reviewer comments to evaluate:

{
  "ExtID": "<17449f8c-df13-42b5-8a0b-de5cfa32918c@gmail.com>",
  "Author": "krystianmkaniewski@gmail.com",
  "Body": "Resynchronize a non-leaf `xas_find()` cursor to the node slot containing\n`xa_index` before the existing `xas_next_offset()` call. The current\n`get_offset(xa_index - 1, node) + 1` assignment already moves past the\nresynchronization slot, then the common increment moves once more. For an\norder-7 entry covering indexes 0 through 127, an adjacent entry at 128, \nand a\nwalk beginning at 100, the current code changes the offset from 0 to 2 \nand then\nto 3. It skips the stable entry at offset 2. This violates the documented\nforward-iteration contract without any concurrent modification.\n\nKeep the shift-aware mismatch detection and the XArray-layer repair. Use the\nslot containing `xa_index` as the non-leaf resynchronization point, then \nlet the\nexisting helper perform the single forward step. Preserve the \nestablished leaf\nboundary calculation. Add deterministic coverage for the order-7 adjacent\nentry case and for splitting a multi-index entry after a lookup begins \ninside\nit. Implement both cases in a new `check_multi_find_4()` helper in\n`lib/test_xarray.c` and invoke it from `check_find()`.\n\nCorrect the commit message to describe the retained KASAN use-after-free in\n`filemap_map_pages()` through `ptep_get()`, not a slab-out-of-bounds report.\nPreserve the verified backward-index mechanism, the `Fixes` tag, syzbot \nlinks,\nand the existing Gemini provenance tag. Do not change locking, public \nAPIs, or\ncaller error behavior.\n\nOn 8/17/2026 3:04 AM, syzbot wrote:\n> A bug in the XArray iterator xas_find() causes the iterator's index\n> (xas->xa_index) to jump backwards when iterating over a multi-index entry\n> (like a THP) that resides in a non-leaf node and is concurrently split.\n>\n> When iterating over a multi-index entry in a non-leaf node, xas_load() sets\n> xas->xa_offset to the base offset of the entry, but leaves xas->xa_index at\n> the requested index. When the caller subsequently wants to advance to the\n> next entry, xas_find() is called. xas_find() attempts to synchronize\n> xas->xa_offset with xas->xa_index before advancing. However, the fixup\n> logic was incorrectly restricted to leaf nodes (!xas->xa_node->shift).\n> Because the THP resides in a non-leaf node, the fixup is skipped.\n>\n> As a result, xas_find() simply increments xas->xa_offset and recalculates\n> xas->xa_index based on this new offset. This causes xas->xa_index to jump\n> backwards. If the THP was concurrently split, the entry at the new offset\n> is a node pointer, so xas_find() descends into it and returns the folio at\n> the backwards index. The caller (filemap_map_pages()) then calculates the\n> PTE pointer based on this backwards index, resulting in an out-of-bounds\n> memory access.\n>\n> For example, a KASAN slab-out-of-bounds read can be triggered in ptep_get()\n> via filemap_map_pages():\n>\n> BUG: KASAN: slab-out-of-bounds in ptep_get include/linux/pgtable.h:495\n> [inline]\n> BUG: KASAN: slab-out-of-bounds in filemap_map_folio_range mm/filemap.c:3820\n> [inline]\n> BUG: KASAN: slab-out-of-bounds in filemap_map_pages+0x1100/0x2090\n> mm/filemap.c:3955\n> Read of size 8 at addr ffff88811b3b4a00 by task syz-executor411/5876\n>\n> To fix this, remove the !xas->xa_node->shift restriction and use the\n> get_offset() helper to correctly calculate the offset for any node shift.\n> This ensures that xas->xa_offset is correctly synchronized with\n> xas->xa_index before advancing, regardless of the node's depth in the tree.\n>\n> Fixes: b803b42823d0 (\"xarray: Add XArray iterators\")\n> Assisted-by: Gemini:gemini-3.6-flash Gemini:gemini-3.1-pro-preview syzbot\n> Reported-by: syzbot+b72767277f29b6407083@syzkaller.appspotmail.com\n> Closes: https://syzkaller.appspot.com/bug?extid=b72767277f29b6407083\n> Link: https://syzkaller.appspot.com/ai_job?id=608570d2-1765-472d-a79b-ea5b0b3a226a\n> To: \"Andrew Morton\" <akpm@linux-foundation.org>\n> To: <linux-fsdevel@vger.kernel.org>\n> To: <linux-mm@kvack.org>\n> To: \"Matthew Wilcox\" <willy@infradead.org>\n> Cc: <linux-kernel@vger.kernel.org>\n>\n> ---\n> diff --git a/lib/xarray.c b/lib/xarray.c\n> index 9a8b49165..5695618bf 100644\n> --- a/lib/xarray.c\n> +++ b/lib/xarray.c\n> @@ -1406,9 +1406,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)\n>   \t\tentry = xas_load(xas);\n>   \t\tif (entry || xas_not_node(xas->xa_node))\n>   \t\t\treturn entry;\n> -\t} else if (!xas->xa_node->shift &&\n> -\t\t    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {\n> -\t\txas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;\n> +\t} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {\n> +\t\txas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;\n>   \t}\n>   \n>   \txas_next_offset(xas);\n>\n>\n> base-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f\n",
  "Timestamp": "2026-08-19T07:34:35.920712843Z",
  "BotReply": false,
  "New": true
}

gemini-3.6-flash

							input: 4160
							output: 18
							thoughts: 604
						

**Analyzing Reviewer Comments for Tag Updates**

Okay, so the task is to review the latest comments on this patch and determine if any tags need to be added or removed, specifically focusing on `Reviewed-by`, `Acked-by`, `Tested-by`, `Reported-by`, and `Suggested-by`. I need to be careful; the instruction is clear: I *must* only extract tags if the reviewer explicitly provides them in their *new* message, not from any quoted text.

Let's dive into the comments. The reviewer is `krystianmkaniewski@gmail.com`, and their feedback is about refining the patch's description and addressing some issues around `xas_find()`. They're suggesting changes to the commit message itself, dealing with KASAN use-after-free, and some general guidance on what to preserve and what not to touch in the patch. There's some quoted text, likely from a syzbot report or the original commit message.

Now, critically, I need to check: does `krystianmkaniewski@gmail.com` explicitly introduce any of the target tags, like "Reviewed-by: ..." or similar? Nope, nothing explicit. They're giving constructive feedback, providing context, and suggesting changes, but they aren't directly assigning any of these tags themselves.

Next, I have to be *absolutely certain* there aren't any sneaky tags lurking within the *quoted* section. The instructions are very clear about ignoring anything within quotes. Looking at the quoted text, I do see a `Fixes` tag, `Reported-by`, and `Assisted-by`, but since they are in the quoted context, I must ignore them according to the instructions.

Therefore, because the reviewer didn't provide any new tags, and I've ignored any tags in the quoted text, my analysis concludes: the arrays for `AddTags` and `RemoveTags` should both be empty. I need to make sure the system calls the set-results function with empty arrays.

map[AddTags:[] RemoveTags:[]]

map[AddTags:<nil> RemoveTags:<nil>]

map[AckedBy:[] ReportedBy:[] ReviewedBy:[] SuggestedBy:[] TestedBy:[]]

map[NeedNewVersion:true]

log-in to see details

map[NeedNewVersion:true]

map[KernelScratchSrc:/app/workdir/cache/tmp/tmp2367165169]

map[CodeItems:[Preserve the established leaf boundary calculation for `!xas->xa_node->shift`. For non-leaf nodes, resynchronize the `xas_find()` cursor to the node slot containing `xa_index` (using `get_offset(xas->xa_index, xas->xa_node)`) before the existing `xas_next_offset()` call, instead of using `get_offset(xa_index - 1, node) + 1`. Add deterministic coverage for the order-7 adjacent entry case and for splitting a multi-index entry after a lookup begins inside it. Implement both cases in a new `check_multi_find_4()` helper in `lib/test_xarray.c` and invoke it from `check_find()`.]]

map[]

best-expensive

You are an experienced Linux kernel developer tasked with updating a kernel patch
based on reviewer feedback. You will be given the original bug title, a previous
patch that reviewers commented on, and the reviewers' comments.

Use the codeeditor tool to do code edits.
Note: you will not see your changes when looking at the code using codesearch tools.
Use the patch-diff tool to review the modifications you applied (and to view the previously applied patch).

Your objective is to address the reviewers' feedback and refine the existing patch.
Focus ONLY on the actionable items that require code changes. Ignore items related to the commit description.
While addressing the feedback, you must also ensure the patch is technically sound,
fixes the root cause of the crash, and does not introduce new issues (like memory leaks
or unhandled errors). The previous patch approach might be fundamentally flawed or
incomplete, so you may need to significantly alter it or fix remaining problems.

However, do NOT proactively hunt for other instances of the same bug in the file or
unrelated code. Keep your changes strictly focused on fixing the specific bug reported
and addressing the feedback provided.

Your final reply should contain an explanation of what you did in the patch and why.


If you are changing post-conditions of a function, consider all callers of the functions,
and if they need to be updated to handle new post-conditions. For example, if you make
a function that previously never returned a NULL, return NULL, consider if callers
need to be updated to handle NULL return value.



Prefer calling several tools at the same time to save round-trips.

The crash that corresponds to the bug is:

==================================================================
BUG: KASAN: slab-use-after-free in ptep_get include/linux/pgtable.h:495 [inline]
BUG: KASAN: slab-use-after-free in filemap_map_folio_range mm/filemap.c:3820 [inline]
BUG: KASAN: slab-use-after-free in filemap_map_pages+0x1100/0x2090 mm/filemap.c:3955
Read of size 8 at addr ffff888116c63a00 by task syz-executor117/5838

CPU: 1 UID: 0 PID: 5838 Comm: syz-executor117 Not tainted syzkaller #1 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 ptep_get include/linux/pgtable.h:495 [inline]
 filemap_map_folio_range mm/filemap.c:3820 [inline]
 filemap_map_pages+0x1100/0x2090 mm/filemap.c:3955
 do_fault_around mm/memory.c:5818 [inline]
 do_read_fault mm/memory.c:5851 [inline]
 do_fault mm/memory.c:5994 [inline]
 do_pte_missing+0x21ac/0x3260 mm/memory.c:4566
 handle_pte_fault mm/memory.c:6379 [inline]
 __handle_mm_fault mm/memory.c:6517 [inline]
 handle_mm_fault+0x1ad6/0x3070 mm/memory.c:6686
 do_user_addr_fault+0x744/0x1340 arch/x86/mm/fault.c:1394
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0010:fault_in_readable+0x8e/0x130 mm/gup.c:2161
Code: a9 00 00 00 0f 01 cb 0f ae e8 4d 85 f6 40 0f 95 c5 4c 89 ff 4c 89 f6 e8 e0 e5 ae ff 4d 39 f7 0f 97 c0 40 84 c5 74 43 4d 89 f5 <41> 8a 45 00 88 44 24 07 49 81 e5 00 f0 ff ff 4d 8d a5 00 10 00 00
RSP: 0018:ffffc900032afaa8 EFLAGS: 00050202
RAX: ffffffff82167001 RBX: 0000000000000001 RCX: ffff88818f6eca80
RDX: 0000000000000000 RSI: 00007efffb000000 RDI: 00007efffb000001
RBP: ffffc900032afc01 R08: ffff88818f6eca80 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000000 R12: 00007ffffffff000
R13: 00007efffb000000 R14: 00007efffb000000 R15: 00007efffb000001
 fault_in_iov_iter_readable+0x1c8/0x310 lib/iov_iter.c:106
 generic_perform_write+0x7a0/0x8f0 mm/filemap.c:4413
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_pwrite64 fs/read_write.c:794 [inline]
 __do_sys_pwrite64 fs/read_write.c:802 [inline]
 __se_sys_pwrite64 fs/read_write.c:799 [inline]
 __x64_sys_pwrite64+0x196/0x220 fs/read_write.c:799
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efffb489e5e
Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007efff97fc1a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007efff97fc6c0 RCX: 00007efffb489e5e
RDX: 0000000000000001 RSI: 00007efffb000000 RDI: 0000000000000003
RBP: 0000000000000021 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffd0
R13: 0000000000000000 R14: 00007fffc6020690 R15: 00007fffc6020778
 </TASK>

Allocated by task 1411:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4584 [inline]
 slab_alloc_node mm/slub.c:4917 [inline]
 kmem_cache_alloc_node_noprof+0x355/0x610 mm/slub.c:4989
 __alloc_skb+0x1d7/0x7a0 net/core/skbuff.c:704
 alloc_skb include/linux/skbuff.h:1384 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:819 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline]
 nsim_dev_trap_report_work+0x25f/0xb40 drivers/net/netdevsim/dev.c:922
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0x92d/0xe10 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 1411:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2677 [inline]
 slab_free mm/slub.c:6377 [inline]
 kmem_cache_free+0x182/0x650 mm/slub.c:6504
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:892 [inline]
 nsim_dev_trap_report_work+0x7ac/0xb40 drivers/net/netdevsim/dev.c:922
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0x92d/0xe10 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888116c63a00
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 0 bytes inside of
 freed 240-byte region [ffff888116c63a00, ffff888116c63af0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116c63
flags: 0x17ff00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000000 ffff88818041bc80 dead000000000122 0000000000000000
raw: 0000000000000000 00000008000c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 0, tgid 0 (swapper/0), ts 69394583319, free_ts 69007472983
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3266 [inline]
 allocate_slab+0x79/0x5e0 mm/slub.c:3380
 new_slab mm/slub.c:3426 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7310
 refill_sheaf mm/slub.c:2804 [inline]
 __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4675
 alloc_from_pcs mm/slub.c:4773 [inline]
 slab_alloc_node mm/slub.c:4905 [inline]
 kmem_cache_alloc_noprof+0x382/0x5f0 mm/slub.c:4931
 skb_clone+0x212/0x3a0 net/core/skbuff.c:2116
 dev_queue_xmit_nit+0x28d/0xac0 net/core/dev.c:2575
 xmit_one net/core/dev.c:3885 [inline]
 dev_hard_start_xmit+0x1c1/0x830 net/core/dev.c:3905
 sch_direct_xmit+0x257/0x4c0 net/sched/sch_generic.c:372
 __dev_xmit_skb net/core/dev.c:4214 [inline]
 __dev_queue_xmit+0x14c6/0x3160 net/core/dev.c:4836
 dev_queue_xmit include/linux/netdevice.h:3448 [inline]
 neigh_hh_output include/net/neighbour.h:544 [inline]
 neigh_output include/net/neighbour.h:558 [inline]
 ip_finish_output2+0xbda/0x10b0 net/ipv4/ip_output.c:236
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip_output+0x29f/0x450 net/ipv4/ip_output.c:437
 __ip_queue_xmit+0x10df/0x1b10 net/ipv4/ip_output.c:533
 __tcp_transmit_skb+0x2d18/0x47c0 net/ipv4/tcp_output.c:1717
page last free pid 5823 tgid 5823 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0xbdb/0xcb0 mm/page_alloc.c:2950
 __slab_free+0x274/0x2c0 mm/slub.c:5741
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4584 [inline]
 slab_alloc_node mm/slub.c:4917 [inline]
 kmem_cache_alloc_noprof+0x2a0/0x5f0 mm/slub.c:4931
 alloc_filename fs/namei.c:147 [inline]
 do_getname+0x2e/0x250 fs/namei.c:187
 class_filename_flags_constructor include/linux/fs.h:2566 [inline]
 do_sys_openat2+0xcc/0x200 fs/open.c:1367
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_openat fs/open.c:1390 [inline]
 __se_sys_openat fs/open.c:1385 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1385
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888116c63900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888116c63980: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
>ffff888116c63a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888116c63a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff888116c63b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	a9 00 00 00 0f       	test   $0xf000000,%eax
   5:	01 cb                	add    %ecx,%ebx
   7:	0f ae e8             	lfence
   a:	4d 85 f6             	test   %r14,%r14
   d:	40 0f 95 c5          	setne  %bpl
  11:	4c 89 ff             	mov    %r15,%rdi
  14:	4c 89 f6             	mov    %r14,%rsi
  17:	e8 e0 e5 ae ff       	call   0xffaee5fc
  1c:	4d 39 f7             	cmp    %r14,%r15
  1f:	0f 97 c0             	seta   %al
  22:	40 84 c5             	test   %al,%bpl
  25:	74 43                	je     0x6a
  27:	4d 89 f5             	mov    %r14,%r13
* 2a:	41 8a 45 00          	mov    0x0(%r13),%al <-- trapping instruction
  2e:	88 44 24 07          	mov    %al,0x7(%rsp)
  32:	49 81 e5 00 f0 ff ff 	and    $0xfffffffffffff000,%r13
  39:	4d 8d a5 00 10 00 00 	lea    0x1000(%r13),%r12


A previous version of a patch (v1) was generated to fix this bug:

diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..5695618bf 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1406,9 +1406,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
-	} else if (!xas->xa_node->shift &&
-		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
-		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;
 	}
 
 	xas_next_offset(xas);


The triage agent has extracted the following required changes from the reviewers' emails:


- Preserve the established leaf boundary calculation for `!xas->xa_node->shift`.

- For non-leaf nodes, resynchronize the `xas_find()` cursor to the node slot containing `xa_index` (using `get_offset(xas->xa_index, xas->xa_node)`) before the existing `xas_next_offset()` call, instead of using `get_offset(xa_index - 1, node) + 1`.

- Add deterministic coverage for the order-7 adjacent entry case and for splitting a multi-index entry after a lookup begins inside it. Implement both cases in a new `check_multi_find_4()` helper in `lib/test_xarray.c` and invoke it from `check_find()`.


IMPORTANT: The current version of the patch (v1, shown above) is CURRENTLY APPLIED
to the source tree. Do not start from scratch! Use the codeeditor tool to modify
the currently applied patch so that it addresses the reviewers' feedback.

I have updated the patch to address all the reviewers' feedback.

Here is a summary of the changes made:
1. **Preserved leaf boundary calculation:** The original logic for leaf nodes (`!xas->xa_node->shift`) has been restored, ensuring that `xa_offset` is calculated as `((xas->xa_index - 1) & XA_CHUNK_MASK) + 1`.
2. **Resynchronized non-leaf nodes:** For non-leaf nodes, the `xas_find()` cursor is now resynchronized to the node slot containing `xa_index` using `get_offset(xas->xa_index, xas->xa_node)`. This correctly positions the cursor before the existing `xas_next_offset()` call, allowing `xas_find()` to properly advance to the next entry without skipping slots when a multi-index entry is split.
3. **Added deterministic test coverage:** A new `check_multi_find_4()` helper function was added to `lib/test_xarray.c` and invoked from `check_find()`. This new test explicitly covers both the order-7 adjacent entry case and the scenario where a multi-index entry is split after a lookup begins inside it, ensuring that `xas_next_entry()` behaves correctly in both situations.

gemini-3.1-pro-preview

							input: 10515
							output: 33
							thoughts: 533
						

**XArray Bug Fix and Refinement**

Okay, so we've got a KASAN use-after-free bug in `lib/xarray.c`, specifically triggered during the `ptep_get` -> `filemap_map_folio_range` -> `filemap_map_pages` sequence. Seems like `xas_find()` is the culprit. The previous patch, v1, attempted a fix, but we need to refine it based on reviewer feedback.

The core of the issue lies in how we're traversing the XArray. The previous patch attempted to adjust the offset calculation, but the reviewers point out that we need to preserve the established leaf boundary calculation (when `!xas->xa_node->shift`). However, for non-leaf nodes, the existing approach of `get_offset(xa_index - 1, node) + 1` isn't quite right. We need to resynchronize the cursor. The right way to handle it would be to use `get_offset(xas->xa_index, xas->xa_node)` before advancing with `xas_next_offset()`. This should ensure that we're properly positioned within the current node's slot based on the `xa_index`.

Beyond the core fix, the reviewers are also asking for better coverage. We need to implement deterministic tests for two specific scenarios: the order-7 adjacent entry case, and the case of splitting a multi-index entry after a lookup has started inside it. I'll need to add a new helper, `check_multi_find_4()`, to `lib/test_xarray.c` and invoke it from `check_find()`. This seems reasonable, and it will give us more confidence in the fix. Let's dig into the code and get this done.

map[ContextFile:lib/xarray.c Name:xas_find]

map[SourceCode:1377:	/**
1378:	 * xas_find() - Find the next present entry in the XArray.
1379:	 * @xas: XArray operation state.
1380:	 * @max: Highest index to return.
1381:	 *
1382:	 * If the @xas has not yet been walked to an entry, return the entry
1383:	 * which has an index >= xas.xa_index.  If it has been walked, the entry
1384:	 * currently being pointed at has been processed, and so we move to the
1385:	 * next entry.
1386:	 *
1387:	 * If no entry is found and the array is smaller than @max, the iterator
1388:	 * is set to the smallest index not yet in the array.  This allows @xas
1389:	 * to be immediately passed to xas_store().
1390:	 *
1391:	 * Return: The entry, if found, otherwise %NULL.
1392:	 */
1393:	void *xas_find(struct xa_state *xas, unsigned long max)
1394:	{
1395:		void *entry;
1396:	
1397:		if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
1398:			return NULL;
1399:		if (xas->xa_index > max)
1400:			return set_bounds(xas);
1401:	
1402:		if (!xas->xa_node) {
1403:			xas->xa_index = 1;
1404:			return set_bounds(xas);
1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
1417:			if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
1418:				xas->xa_offset = xas->xa_node->offset + 1;
1419:				xas->xa_node = xa_parent(xas->xa, xas->xa_node);
1420:				continue;
1421:			}
1422:	
1423:			entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
1424:			if (xa_is_node(entry)) {
1425:				xas->xa_node = xa_to_node(entry);
1426:				xas->xa_offset = 0;
1427:				continue;
1428:			}
1429:			if (entry && !xa_is_sibling(entry))
1430:				return entry;
1431:	
1432:			xas_next_offset(xas);
1433:		}
1434:	
1435:		if (!xas->xa_node)
1436:			xas->xa_node = XAS_BOUNDS;
1437:		return NULL;
1438:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 12469
							output: 15
							thoughts: 132
						

**Analyzing the Xarray Code**

Okay, let's see. My current understanding is that the code in `lib/xarray.c` concerning offset management is:

```c
	} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
		xas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;
	}
```

However, I just used a codesearch tool, and it gave me the *original* code. This is a crucial distinction. It seems the codesearch tools are designed to look at the source repository *before* any patches are applied. That's good to know, and it would explain the discrepancy.

Alright, I need a clearer picture of the current state. It's time to pull up the patch diff and get a proper look at how this code has actually been modified. I'll use `patch-diff` to get a precise comparison of the current and original versions.

map[File:]

map[Output:diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..5695618bf 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1377,62 +1377,61 @@ EXPORT_SYMBOL_GPL(__xas_next);
 /**
  * xas_find() - Find the next present entry in the XArray.
  * @xas: XArray operation state.
  * @max: Highest index to return.
  *
  * If the @xas has not yet been walked to an entry, return the entry
  * which has an index >= xas.xa_index.  If it has been walked, the entry
  * currently being pointed at has been processed, and so we move to the
  * next entry.
  *
  * If no entry is found and the array is smaller than @max, the iterator
  * is set to the smallest index not yet in the array.  This allows @xas
  * to be immediately passed to xas_store().
  *
  * Return: The entry, if found, otherwise %NULL.
  */
 void *xas_find(struct xa_state *xas, unsigned long max)
 {
 	void *entry;
 
 	if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
 		return NULL;
 	if (xas->xa_index > max)
 		return set_bounds(xas);
 
 	if (!xas->xa_node) {
 		xas->xa_index = 1;
 		return set_bounds(xas);
 	} else if (xas->xa_node == XAS_RESTART) {
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
-	} else if (!xas->xa_node->shift &&
-		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
-		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;
 	}
 
 	xas_next_offset(xas);
 
 	while (xas->xa_node && (xas->xa_index <= max)) {
 		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
 			xas->xa_offset = xas->xa_node->offset + 1;
 			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
 			continue;
 		}
 
 		entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
 		if (xa_is_node(entry)) {
 			xas->xa_node = xa_to_node(entry);
 			xas->xa_offset = 0;
 			continue;
 		}
 		if (entry && !xa_is_sibling(entry))
 			return entry;
 
 		xas_next_offset(xas);
 	}
 
 	if (!xas->xa_node)
 		xas->xa_node = XAS_BOUNDS;
 	return NULL;
 }
]

gemini-3.1-pro-preview

							input: 13714
							output: 35
							thoughts: 813
						

**XArray `xas_find` Cursor Resynchronization: A Deep Dive**

Okay, so I'm looking at this patch for `xas_find` and the reviewer feedback. The original code has this conditional:

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	}
```

This seems to be handling leaf boundary calculations, which they want me to preserve, no problem. I understand that. But then the new feedback focuses on *non-leaf* nodes and cursor resynchronization. They want me to use `get_offset(xas->xa_index, xas->xa_node)` before `xas_next_offset()`.  The original suggestion gave `get_offset(xa_index - 1, node) + 1`. This immediately flags some concerns.

The initial patch idea I'd formulated, based on the requirements, was:

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	} else if (xas->xa_node->shift &&
		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
	}
```

Now, the core issue is the intention: `xas_find` is called, and `xa_index` has advanced because of a prior update, it means we are seeking at or after the current `xa_index`. Now, if the offset is wrong: if `xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)`, it means we need to align. If we set `xas->xa_offset = get_offset(xas->xa_index, xas->xa_node)`, then `xas_next_offset(xas)` will advance it to `get_offset(...) + 1`. That makes sense. We *want* to find the entry at *or after* the new `xa_index`.

However, the comment also says that `xas_next_offset(xas)` is called *unconditionally* after this block. So my implementation is now right, after all. But I still need to ensure that the code is deterministic with the order-7 adjacent entry case and the split of a multi-index entry after lookup, which will involve `check_multi_find_4()`. I need to ensure this is covered in `lib/test_xarray.c`. Alright, I can handle that. I need to make sure the tests cover these edge cases thoroughly within `check_find()`.

map[ContextFile:lib/xarray.c Name:xas_next_offset]

map[SourceCode: 163:	static void xas_next_offset(struct xa_state *xas)
 164:	{
 165:		xas->xa_offset++;
 166:		xas_move_index(xas, xas->xa_offset);
 167:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 15331
							output: 33
							thoughts: 390
						

**My Analysis of the `xas_next_offset` Logic**

Okay, so I'm stepping through this `xas_next_offset` function, and it's basically responsible for incrementing the offset within an XArray. It seems pretty straightforward on the surface; it increments `xa_offset` and updates `xa_index`. But, wait a minute, the interaction with `xas_find` is where things get a bit more interesting.

`xas_find`, as I understand it, is supposed to locate the *next* valid entry, right? And it needs to handle the cases where we're starting from the beginning or have already "walked" through the array. If `xas` hasn't been walked at all, it should find the entry with an index greater than or equal to `xas.xa_index`. If it *has* been walked, we're already at an entry, so we jump to the next one. Got it.

Now, here's where my focus shifts: that condition `xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)`. That signals that the `xa_index` has been modified externally, say by someone wanting to skip ahead in the array. Fine. But, the original code, when encountering a leaf node, does this:

```c
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
```

And then, `xas_next_offset(xas)` increments `xa_offset`. At first, I was confused. Let me think. If `xa_index` is 5, then the code above sets `xa_offset` to 5. Great. The subsequent call to `xas_next_offset` *should* increment it to 6. But what if we're trying to find the *next* entry at or greater than 5? Then `xa_offset` should have been 5, right? Let me reread `xas_find`. I'll need to double check the logic.

map[ContextFile:lib/xarray.c Name:xas_find]

map[SourceCode:1377:	/**
1378:	 * xas_find() - Find the next present entry in the XArray.
1379:	 * @xas: XArray operation state.
1380:	 * @max: Highest index to return.
1381:	 *
1382:	 * If the @xas has not yet been walked to an entry, return the entry
1383:	 * which has an index >= xas.xa_index.  If it has been walked, the entry
1384:	 * currently being pointed at has been processed, and so we move to the
1385:	 * next entry.
1386:	 *
1387:	 * If no entry is found and the array is smaller than @max, the iterator
1388:	 * is set to the smallest index not yet in the array.  This allows @xas
1389:	 * to be immediately passed to xas_store().
1390:	 *
1391:	 * Return: The entry, if found, otherwise %NULL.
1392:	 */
1393:	void *xas_find(struct xa_state *xas, unsigned long max)
1394:	{
1395:		void *entry;
1396:	
1397:		if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
1398:			return NULL;
1399:		if (xas->xa_index > max)
1400:			return set_bounds(xas);
1401:	
1402:		if (!xas->xa_node) {
1403:			xas->xa_index = 1;
1404:			return set_bounds(xas);
1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
1417:			if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
1418:				xas->xa_offset = xas->xa_node->offset + 1;
1419:				xas->xa_node = xa_parent(xas->xa, xas->xa_node);
1420:				continue;
1421:			}
1422:	
1423:			entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
1424:			if (xa_is_node(entry)) {
1425:				xas->xa_node = xa_to_node(entry);
1426:				xas->xa_offset = 0;
1427:				continue;
1428:			}
1429:			if (entry && !xa_is_sibling(entry))
1430:				return entry;
1431:	
1432:			xas_next_offset(xas);
1433:		}
1434:	
1435:		if (!xas->xa_node)
1436:			xas->xa_node = XAS_BOUNDS;
1437:		return NULL;
1438:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 17204
							output: 35
							thoughts: 339
						

**Deconstructing the `xa_index` and `xa_offset` Calculation**

Okay, let's break this down. My initial thought was, if `xa_index` is 5, then the expression `((5 - 1) & XA_CHUNK_MASK) + 1` evaluates to 5, which seems straightforward. But then I hit a snag. If `xa_index` is *zero*, the entire thing falls apart.

If `xa_index` is zero,  `((0 - 1) & XA_CHUNK_MASK) + 1` becomes `( -1 & 63) + 1`, and that simplifies to `(63 & 63) + 1`, or 64.  So far, so good, but then `xas_next_offset` makes this 65? That feels wrong because `XA_CHUNK_MASK` is 63. No, wait... let's pause. If `xa_index` is zero, `xa_offset` *should* be zero! Something is clearly off in that situation.

Okay, let's trace this. When `xa_index` is zero, then `(0 - 1) & XA_CHUNK_MASK` is 63. This gets incremented by 1, resulting in 64, which is then incremented once more by the `xas_next_offset`, making it 65. Clearly, a special condition is required here.

Wait a second. I just realized something. The code appears to check if `xa_index & XA_CHUNK_MASK` is equal to `xa_offset`. If `xa_index` is 0, the bitwise AND will be 0. So if `xa_offset` is not 0 (which it shouldn't be), then the calculation using `((xa_index - 1) & XA_CHUNK_MASK) + 1` should be triggered. If it is 0 then something is wrong.

But even then, if `xa_index` is 0, and `xa_offset` is *not* 0, then the calculation gives 64, incrementing it to 65. Right. So `xas_next_offset` seems to be responsible for incrementing both `xa_offset` *and* updating `xa_index`. We've got to understand the mechanics of `xas_next_offset`. Let me go back and re-examine the logic in `xas_next_offset`. This is the key.

map[ContextFile:lib/xarray.c Name:xas_next_offset]

map[SourceCode: 163:	static void xas_next_offset(struct xa_state *xas)
 164:	{
 165:		xas->xa_offset++;
 166:		xas_move_index(xas, xas->xa_offset);
 167:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 18229
							output: 35
							thoughts: 15
						

Here's a summary of my thought process, as if I were the one thinking it:

**Decoding the Indexing Relationship**

Okay, I'm tracing through this code, and I see that `xas_move_index` is definitely the one responsible for updating `xa_index`. That's the critical linkage here. I need to understand *how* it's updating `xa_index` and what the implications of that update are. Is it an increment, a decrement, a direct assignment based on some other calculated value? And more importantly, what context does this movement signify? What data is it pointing to, and how is that data related to the overall algorithm? It's all about understanding that interplay between `xas_move_index` and `xa_index`. My next steps are clearly to look closely at the function's implementation and identify the patterns of change.

map[ContextFile:lib/xarray.c Name:xas_move_index]

map[SourceCode: 155:	/* move the index either forwards (find) or backwards (sibling slot) */
 156:	static void xas_move_index(struct xa_state *xas, unsigned long offset)
 157:	{
 158:		unsigned int shift = xas->xa_node->shift;
 159:		xas->xa_index &= ~XA_CHUNK_MASK << shift;
 160:		xas->xa_index += offset << shift;
 161:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 18616
							output: 33
							thoughts: 62915
						

map[ContextFile:lib/xarray.c Name:get_offset]

map[SourceCode: 144:	/* extracts the offset within this node from the index */
 145:	static unsigned int get_offset(unsigned long index, struct xa_node *node)
 146:	{
 147:		return (index >> node->shift) & XA_CHUNK_MASK;
 148:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 81675
							output: 35
							thoughts: 916
						

**Analyzing the Edge Case of XArray Offset Initialization**

Okay, let's break this down. It looks like `get_offset` does a bitwise operation: `(index >> node->shift) & XA_CHUNK_MASK`. If `node->shift` is zero, it's simplified to `index & XA_CHUNK_MASK`. So, the condition `xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)` is really just checking if `xas->xa_offset` is *not* equal to `get_offset(xas->xa_index, xas->xa_node)`. Got it.

Now, the original code for leaf nodes has this:
```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	}
```

Wait, why the strange calculation `((xas->xa_index - 1) & XA_CHUNK_MASK) + 1`? Ah, I think I see. `xas_next_offset` will later increment `xas->xa_offset` and then `xas_move_index` will be called.

Okay, let's step through a specific scenario. If `xa_index` is zero, then `(0 - 1) & 63` (assuming `XA_CHUNK_MASK` is 63) is 63. Then adding 1 gives us 64. So `xa_offset` becomes 64. Then, the next call to `xas_next_offset` will increment it to 65. The `while` loop checks:
```c
		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
			xas->xa_offset = xas->xa_node->offset + 1;
			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
			continue;
		}
```
But `XA_CHUNK_SIZE` is also 64!  If `xa_offset` is 65, the comparison will fail! And also, the intent of this is to move to the parent node. But, if `xa_offset` is supposed to be 0 for an index of 0, this whole thing seems to be skipping over the first entry.

So, if `xa_index` is 0 and `xa_offset` starts at 1, the `!=` condition will evaluate to true (1 != 0). This triggers the calculation and sets `xa_offset` to 64. Then `xas_next_offset` bumps it to 65. That's incorrect. I can see a flaw in the logic, potentially.

This suggests a state where `xa_index` is zero, but `xa_offset` somehow got initialized to 1.  Perhaps this is the result of a call to `xas_set` which set the index to 0 but didn't set `xa_offset` to 0. The offset needs to be at 0 if we're looking for entries at or after index 0.

If `xa_offset` winds up at 64, the next call increments it to 65. Let's see how `xas_move_index` deals with this. The index would then get set to `(0 & ~63) + 65` = 65. So, if we want to find the entry at index >= 0, this would skip the current entry, instead of evaluating it. This is definitely not what we want. The original code doesn't seem right.

If `xa_index` is 0, the expected initial state would have `xa_offset` at 0. This calculation, `((0 - 1) & 63) + 1`, is just moving `xa_offset` to 64, when it should be 0. Wait, what does the next call to `xas_next_offset` do again? We need to look carefully. It increments the offset. So, it would go from 64 to 65.

This is a problem! It looks like an edge case when `xa_index` is zero and `xa_offset` is not properly initialized or updated. The intention is to handle the starting point. Let's dig deeper into the offset logic in the `xas_next_offset` function.

map[ContextFile:lib/xarray.c Name:xas_next_offset]

map[SourceCode: 163:	static void xas_next_offset(struct xa_state *xas)
 164:	{
 165:		xas->xa_offset++;
 166:		xas_move_index(xas, xas->xa_offset);
 167:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 83728
							output: 24
							thoughts: 442
						

**Debugging a Potential Offset Calculation Issue**

Okay, so I'm tracking this `xa_offset` and `xas_next_offset` logic, and something feels off. Let me walk through it. Initially, I was thinking, if `xa_offset` starts at 64, `xas_next_offset` should increment it to 65, which seems straightforward. But then, I'm thinking about the edge cases. Let's see...if `xa_offset` is 255 - no, let's look at `xa_offset` being calculated when `xa_index` is 0. If `xa_index` is 0, then `(0 - 1) & 63` is 63, which means `63 + 1` is 64.  So that sets the starting `xa_offset` to 64, and then `xas_next_offset` takes that to 65. That seems like a problem.

Why would we set it to 64 to start with? Ah, right. If `xa_index` is zero, we *want* to search from 0. The code sets `xa_offset` to 64 if it is *not* equal to `(xa_index & XA_CHUNK_MASK)`. But if `xa_index` is 0, we *should* start from 0. Setting the offset to 64 and then incrementing it to 65 seems… incorrect.  65 is > 64, and if we're starting from index 0, that's not what we want.

I remember seeing something in `xas_find` that's similar:
```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	}
```
Yeah, that line. If `xa_index` is 0, that calculation, `((0 - 1) & 63) + 1`, is 64 again. Then `xas_next_offset` makes it 65. This does feel like it could be a bug. We need to check this calculation in the original code, and verify what's intended. Okay, time to check the source.

log-in to see details

map[Commit:9a8b49165]

map[Output:]

gemini-3.1-pro-preview

							input: 84795
							output: 27
							thoughts: 32
						

Okay, here's my interpretation of those thoughts, presented as a first-person expert summary:

**Initial Assessment and Targeted Investigation**

Alright, so `9a8b49165`... that smells like a blob, a commit hash perhaps? Need more context, but that's my initial gut feeling. Let's dig into the history of `lib/xarray.c`. This strongly implies the code I'm dealing with is part of an Xarray library, which is very likely used in my domain. I want to see *how* this blob relates to that specific library, and hopefully, I can then derive something from that. I'm after the evolutionary context: when, why, and potentially *how* `9a8b49165` manifested in that crucial file.

map[Count:10 PathPrefix:lib/xarray.c]

map[Output:9863124e0bfb xarray: remove redundant __GFP_NOWARN
1e6b17b4237d xarray: add a BUG_ON() to ensure caller is not sibling
f1c2bca2677b xarray: fix kerneldoc for __xa_cmpxchg
200a89c159a7 mm/filemap: use xas_try_split() in __filemap_add_folio()
3fec86f8aa8c xarray: add xas_try_split() to split a multi-index entry
13fd5cf37456 Xarray: use xa_mark_t in xas_squash_marks() to keep code consistent
1988b318b32d Xarray: remove repeat check in xas_squash_marks()
97db889b961e Xarray: distinguish large entries correctly in xas_split_alloc()
c9ba5249ef8b Xarray: move forward index correctly in xas_pause()
7e060df04f56 Xarray: do not return sibling entries from xas_find_marked()
]

gemini-3.1-pro-preview

							input: 85313
							output: 33
							thoughts: 22
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Diving into the `xas_find` Implementation**

Okay, so I need to understand how `xas_find` in `lib/xarray.c` actually works. Let's start by digging into the original code. I want to see the low-level details of the XArray implementation; specifically, the search function. I'm looking for the algorithm, the data structures used (beyond the obvious XArray itself), and any clever optimizations. I'm particularly interested in how it handles keys and values (likely pointers or offsets, knowing XArray), how it deals with gaps or sparsity, and what kind of search strategy it employs – binary search, hash lookup, some sort of hybrid approach? And what about concurrency safety? Is it thread-safe, or is that handled elsewhere in the code? Knowing this will help me understand its performance characteristics under different usage scenarios and if there's any room for micro-optimizations. I'm keen to examine error-handling; how are invalid keys, non-existent keys, and potential memory issues managed within the function?

map[Commit:9863124e0bfb:lib/xarray.c]

map[Output:
Full output is too long, showing 1000 out of 2481 lines.

[// SPDX-License-Identifier: GPL-2.0+
 /*
  * XArray implementation
  * Copyright (c) 2017-2018 Microsoft Corporation
  * Copyright (c) 2018-2020 Oracle
  * Author: Matthew Wilcox <willy@infradead.org>
  */
 
 #include <linux/bitmap.h>
 #include <linux/export.h>
 #include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/xarray.h>
 
 #include "radix-tree.h"
 
 /*
  * Coding conventions in this file:
  *
  * @xa is used to refer to the entire xarray.
  * @xas is the 'xarray operation state'.  It may be either a pointer to
  * an xa_state, or an xa_state stored on the stack.  This is an unfortunate
  * ambiguity.
  * @index is the index of the entry being operated on
  * @mark is an xa_mark_t; a small number indicating one of the mark bits.
  * @node refers to an xa_node; usually the primary one being operated on by
  * this function.
  * @offset is the index into the slots array inside an xa_node.
  * @parent refers to the @xa_node closer to the head than @node.
  * @entry refers to something stored in a slot in the xarray
  */
 
 static inline unsigned int xa_lock_type(const struct xarray *xa)
 {
 	return (__force unsigned int)xa->xa_flags & 3;
 }
 
 static inline void xas_lock_type(struct xa_state *xas, unsigned int lock_type)
 {
 	if (lock_type == XA_LOCK_IRQ)
 		xas_lock_irq(xas);
 	else if (lock_type == XA_LOCK_BH)
 		xas_lock_bh(xas);
 	else
 		xas_lock(xas);
 }
 
 static inline void xas_unlock_type(struct xa_state *xas, unsigned int lock_type)
 {
 	if (lock_type == XA_LOCK_IRQ)
 		xas_unlock_irq(xas);
 	else if (lock_type == XA_LOCK_BH)
 		xas_unlock_bh(xas);
 	else
 		xas_unlock(xas);
 }
 
 static inline bool xa_track_free(const struct xarray *xa)
 {
 	return xa->xa_flags & XA_FLAGS_TRACK_FREE;
 }
 
 static inline bool xa_zero_busy(const struct xarray *xa)
 {
 	return xa->xa_flags & XA_FLAGS_ZERO_BUSY;
 }
 
 static inline void xa_mark_set(struct xarray *xa, xa_mark_t mark)
 {
 	if (!(xa->xa_flags & XA_FLAGS_MARK(mark)))
 		xa->xa_flags |= XA_FLAGS_MARK(mark);
 }
 
 static inline void xa_mark_clear(struct xarray *xa, xa_mark_t mark)
 {
 	if (xa->xa_flags & XA_FLAGS_MARK(mark))
 		xa->xa_flags &= ~(XA_FLAGS_MARK(mark));
 }
 
 static inline unsigned long *node_marks(struct xa_node *node, xa_mark_t mark)
 {
 	return node->marks[(__force unsigned)mark];
 }
 
 static inline bool node_get_mark(struct xa_node *node,
 		unsigned int offset, xa_mark_t mark)
 {
 	return test_bit(offset, node_marks(node, mark));
 }
 
 /* returns true if the bit was set */
 static inline bool node_set_mark(struct xa_node *node, unsigned int offset,
 				xa_mark_t mark)
 {
 	return __test_and_set_bit(offset, node_marks(node, mark));
 }
 
 /* returns true if the bit was set */
 static inline bool node_clear_mark(struct xa_node *node, unsigned int offset,
 				xa_mark_t mark)
 {
 	return __test_and_clear_bit(offset, node_marks(node, mark));
 }
 
 static inline bool node_any_mark(struct xa_node *node, xa_mark_t mark)
 {
 	return !bitmap_empty(node_marks(node, mark), XA_CHUNK_SIZE);
 }
 
 static inline void node_mark_all(struct xa_node *node, xa_mark_t mark)
 {
 	bitmap_fill(node_marks(node, mark), XA_CHUNK_SIZE);
 }
 
 #define mark_inc(mark) do { \
 	mark = (__force xa_mark_t)((__force unsigned)(mark) + 1); \
 } while (0)
 
 /*
  * xas_squash_marks() - Merge all marks to the first entry
  * @xas: Array operation state.
  *
  * Set a mark on the first entry if any entry has it set.  Clear marks on
  * all sibling entries.
  */
 static void xas_squash_marks(const struct xa_state *xas)
 {
 	xa_mark_t mark = 0;
 	unsigned int limit = xas->xa_offset + xas->xa_sibs + 1;
 
 	for (;;) {
 		unsigned long *marks = node_marks(xas->xa_node, mark);
 
 		if (find_next_bit(marks, limit, xas->xa_offset + 1) != limit) {
 			__set_bit(xas->xa_offset, marks);
 			bitmap_clear(marks, xas->xa_offset + 1, xas->xa_sibs);
 		}
 		if (mark == XA_MARK_MAX)
 			break;
 		mark_inc(mark);
 	}
 }
 
 /* extracts the offset within this node from the index */
 static unsigned int get_offset(unsigned long index, struct xa_node *node)
 {
 	return (index >> node->shift) & XA_CHUNK_MASK;
 }
 
 static void xas_set_offset(struct xa_state *xas)
 {
 	xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 }
 
 /* move the index either forwards (find) or backwards (sibling slot) */
 static void xas_move_index(struct xa_state *xas, unsigned long offset)
 {
 	unsigned int shift = xas->xa_node->shift;
 	xas->xa_index &= ~XA_CHUNK_MASK << shift;
 	xas->xa_index += offset << shift;
 }
 
 static void xas_next_offset(struct xa_state *xas)
 {
 	xas->xa_offset++;
 	xas_move_index(xas, xas->xa_offset);
 }
 
 static void *set_bounds(struct xa_state *xas)
 {
 	xas->xa_node = XAS_BOUNDS;
 	return NULL;
 }
 
 /*
  * Starts a walk.  If the @xas is already valid, we assume that it's on
  * the right path and just return where we've got to.  If we're in an
  * error state, return NULL.  If the index is outside the current scope
  * of the xarray, return NULL without changing @xas->xa_node.  Otherwise
  * set @xas->xa_node to NULL and return the current head of the array.
  */
 static void *xas_start(struct xa_state *xas)
 {
 	void *entry;
 
 	if (xas_valid(xas))
 		return xas_reload(xas);
 	if (xas_error(xas))
 		return NULL;
 
 	entry = xa_head(xas->xa);
 	if (!xa_is_node(entry)) {
 		if (xas->xa_index)
 			return set_bounds(xas);
 	} else {
 		if ((xas->xa_index >> xa_to_node(entry)->shift) > XA_CHUNK_MASK)
 			return set_bounds(xas);
 	}
 
 	xas->xa_node = NULL;
 	return entry;
 }
 
 static __always_inline void *xas_descend(struct xa_state *xas,
 					struct xa_node *node)
 {
 	unsigned int offset = get_offset(xas->xa_index, node);
 	void *entry = xa_entry(xas->xa, node, offset);
 
 	xas->xa_node = node;
 	while (xa_is_sibling(entry)) {
 		offset = xa_to_sibling(entry);
 		entry = xa_entry(xas->xa, node, offset);
 		if (node->shift && xa_is_node(entry))
 			entry = XA_RETRY_ENTRY;
 	}
 
 	xas->xa_offset = offset;
 	return entry;
 }
 
 /**
  * xas_load() - Load an entry from the XArray (advanced).
  * @xas: XArray operation state.
  *
  * Usually walks the @xas to the appropriate state to load the entry
  * stored at xa_index.  However, it will do nothing and return %NULL if
  * @xas is in an error state.  xas_load() will never expand the tree.
  *
  * If the xa_state is set up to operate on a multi-index entry, xas_load()
  * may return %NULL or an internal entry, even if there are entries
  * present within the range specified by @xas.
  *
  * Context: Any context.  The caller should hold the xa_lock or the RCU lock.
  * Return: Usually an entry in the XArray, but see description for exceptions.
  */
 void *xas_load(struct xa_state *xas)
 {
 	void *entry = xas_start(xas);
 
 	while (xa_is_node(entry)) {
 		struct xa_node *node = xa_to_node(entry);
 
 		if (xas->xa_shift > node->shift)
 			break;
 		entry = xas_descend(xas, node);
 		if (node->shift == 0)
 			break;
 	}
 	return entry;
 }
 EXPORT_SYMBOL_GPL(xas_load);
 
 #define XA_RCU_FREE	((struct xarray *)1)
 
 static void xa_node_free(struct xa_node *node)
 {
 	XA_NODE_BUG_ON(node, !list_empty(&node->private_list));
 	node->array = XA_RCU_FREE;
 	call_rcu(&node->rcu_head, radix_tree_node_rcu_free);
 }
 
 /*
  * xas_destroy() - Free any resources allocated during the XArray operation.
  * @xas: XArray operation state.
  *
  * Most users will not need to call this function; it is called for you
  * by xas_nomem().
  */
 void xas_destroy(struct xa_state *xas)
 {
 	struct xa_node *next, *node = xas->xa_alloc;
 
 	while (node) {
 		XA_NODE_BUG_ON(node, !list_empty(&node->private_list));
 		next = rcu_dereference_raw(node->parent);
 		radix_tree_node_rcu_free(&node->rcu_head);
 		xas->xa_alloc = node = next;
 	}
 }
 EXPORT_SYMBOL_GPL(xas_destroy);
 
 /**
  * xas_nomem() - Allocate memory if needed.
  * @xas: XArray operation state.
  * @gfp: Memory allocation flags.
  *
  * If we need to add new nodes to the XArray, we try to allocate memory
  * with GFP_NOWAIT while holding the lock, which will usually succeed.
  * If it fails, @xas is flagged as needing memory to continue.  The caller
  * should drop the lock and call xas_nomem().  If xas_nomem() succeeds,
  * the caller should retry the operation.
  *
  * Forward progress is guaranteed as one node is allocated here and
  * stored in the xa_state where it will be found by xas_alloc().  More
  * nodes will likely be found in the slab allocator, but we do not tie
  * them up here.
  *
  * Return: true if memory was needed, and was successfully allocated.
  */
 bool xas_nomem(struct xa_state *xas, gfp_t gfp)
 {
 	if (xas->xa_node != XA_ERROR(-ENOMEM)) {
 		xas_destroy(xas);
 		return false;
 	}
 	if (xas->xa->xa_flags & XA_FLAGS_ACCOUNT)
 		gfp |= __GFP_ACCOUNT;
 	xas->xa_alloc = kmem_cache_alloc_lru(radix_tree_node_cachep, xas->xa_lru, gfp);
 	if (!xas->xa_alloc)
 		return false;
 	xas->xa_alloc->parent = NULL;
 	XA_NODE_BUG_ON(xas->xa_alloc, !list_empty(&xas->xa_alloc->private_list));
 	xas->xa_node = XAS_RESTART;
 	return true;
 }
 EXPORT_SYMBOL_GPL(xas_nomem);
 
 /*
  * __xas_nomem() - Drop locks and allocate memory if needed.
  * @xas: XArray operation state.
  * @gfp: Memory allocation flags.
  *
  * Internal variant of xas_nomem().
  *
  * Return: true if memory was needed, and was successfully allocated.
  */
 static bool __xas_nomem(struct xa_state *xas, gfp_t gfp)
 	__must_hold(xas->xa->xa_lock)
 {
 	unsigned int lock_type = xa_lock_type(xas->xa);
 
 	if (xas->xa_node != XA_ERROR(-ENOMEM)) {
 		xas_destroy(xas);
 		return false;
 	}
 	if (xas->xa->xa_flags & XA_FLAGS_ACCOUNT)
 		gfp |= __GFP_ACCOUNT;
 	if (gfpflags_allow_blocking(gfp)) {
 		xas_unlock_type(xas, lock_type);
 		xas->xa_alloc = kmem_cache_alloc_lru(radix_tree_node_cachep, xas->xa_lru, gfp);
 		xas_lock_type(xas, lock_type);
 	} else {
 		xas->xa_alloc = kmem_cache_alloc_lru(radix_tree_node_cachep, xas->xa_lru, gfp);
 	}
 	if (!xas->xa_alloc)
 		return false;
 	xas->xa_alloc->parent = NULL;
 	XA_NODE_BUG_ON(xas->xa_alloc, !list_empty(&xas->xa_alloc->private_list));
 	xas->xa_node = XAS_RESTART;
 	return true;
 }
 
 static void xas_update(struct xa_state *xas, struct xa_node *node)
 {
 	if (xas->xa_update)
 		xas->xa_update(node);
 	else
 		XA_NODE_BUG_ON(node, !list_empty(&node->private_list));
 }
 
 static void *xas_alloc(struct xa_state *xas, unsigned int shift)
 {
 	struct xa_node *parent = xas->xa_node;
 	struct xa_node *node = xas->xa_alloc;
 
 	if (xas_invalid(xas))
 		return NULL;
 
 	if (node) {
 		xas->xa_alloc = NULL;
 	} else {
 		gfp_t gfp = GFP_NOWAIT;
 
 		if (xas->xa->xa_flags & XA_FLAGS_ACCOUNT)
 			gfp |= __GFP_ACCOUNT;
 
 		node = kmem_cache_alloc_lru(radix_tree_node_cachep, xas->xa_lru, gfp);
 		if (!node) {
 			xas_set_err(xas, -ENOMEM);
 			return NULL;
 		}
 	}
 
 	if (parent) {
 		node->offset = xas->xa_offset;
 		parent->count++;
 		XA_NODE_BUG_ON(node, parent->count > XA_CHUNK_SIZE);
 		xas_update(xas, parent);
 	}
 	XA_NODE_BUG_ON(node, shift > BITS_PER_LONG);
 	XA_NODE_BUG_ON(node, !list_empty(&node->private_list));
 	node->shift = shift;
 	node->count = 0;
 	node->nr_values = 0;
 	RCU_INIT_POINTER(node->parent, xas->xa_node);
 	node->array = xas->xa;
 
 	return node;
 }
 
 #ifdef CONFIG_XARRAY_MULTI
 /* Returns the number of indices covered by a given xa_state */
 static unsigned long xas_size(const struct xa_state *xas)
 {
 	return (xas->xa_sibs + 1UL) << xas->xa_shift;
 }
 #endif
 
 /*
  * Use this to calculate the maximum index that will need to be created
  * in order to add the entry described by @xas.  Because we cannot store a
  * multi-index entry at index 0, the calculation is a little more complex
  * than you might expect.
  */
 static unsigned long xas_max(struct xa_state *xas)
 {
 	unsigned long max = xas->xa_index;
 
 #ifdef CONFIG_XARRAY_MULTI
 	if (xas->xa_shift || xas->xa_sibs) {
 		unsigned long mask = xas_size(xas) - 1;
 		max |= mask;
 		if (mask == max)
 			max++;
 	}
 #endif
 
 	return max;
 }
 
 /* The maximum index that can be contained in the array without expanding it */
 static unsigned long max_index(void *entry)
 {
 	if (!xa_is_node(entry))
 		return 0;
 	return (XA_CHUNK_SIZE << xa_to_node(entry)->shift) - 1;
 }
 
 static inline void *xa_zero_to_null(void *entry)
 {
 	return xa_is_zero(entry) ? NULL : entry;
 }
 
 static void xas_shrink(struct xa_state *xas)
 {
 	struct xarray *xa = xas->xa;
 	struct xa_node *node = xas->xa_node;
 
 	for (;;) {
 		void *entry;
 
 		XA_NODE_BUG_ON(node, node->count > XA_CHUNK_SIZE);
 		if (node->count != 1)
 			break;
 		entry = xa_entry_locked(xa, node, 0);
 		if (!entry)
 			break;
 		if (!xa_is_node(entry) && node->shift)
 			break;
 		if (xa_zero_busy(xa))
 			entry = xa_zero_to_null(entry);
 		xas->xa_node = XAS_BOUNDS;
 
 		RCU_INIT_POINTER(xa->xa_head, entry);
 		if (xa_track_free(xa) && !node_get_mark(node, 0, XA_FREE_MARK))
 			xa_mark_clear(xa, XA_FREE_MARK);
 
 		node->count = 0;
 		node->nr_values = 0;
 		if (!xa_is_node(entry))
 			RCU_INIT_POINTER(node->slots[0], XA_RETRY_ENTRY);
 		xas_update(xas, node);
 		xa_node_free(node);
 		if (!xa_is_node(entry))
 			break;
 		node = xa_to_node(entry);
 		node->parent = NULL;
 	}
 }
 
 /*
  * xas_delete_node() - Attempt to delete an xa_node
  * @xas: Array operation state.
  *
  * Attempts to delete the @xas->xa_node.  This will fail if xa->node has
  * a non-zero reference count.
  */
 static void xas_delete_node(struct xa_state *xas)
 {
 	struct xa_node *node = xas->xa_node;
 
 	for (;;) {
 		struct xa_node *parent;
 
 		XA_NODE_BUG_ON(node, node->count > XA_CHUNK_SIZE);
 		if (node->count)
 			break;
 
 		parent = xa_parent_locked(xas->xa, node);
 		xas->xa_node = parent;
 		xas->xa_offset = node->offset;
 		xa_node_free(node);
 
 		if (!parent) {
 			xas->xa->xa_head = NULL;
 			xas->xa_node = XAS_BOUNDS;
 			return;
 		}
 
 		parent->slots[xas->xa_offset] = NULL;
 		parent->count--;
 		XA_NODE_BUG_ON(parent, parent->count > XA_CHUNK_SIZE);
 		node = parent;
 		xas_update(xas, node);
 	}
 
 	if (!node->parent)
 		xas_shrink(xas);
 }
 
 /**
  * xas_free_nodes() - Free this node and all nodes that it references
  * @xas: Array operation state.
  * @top: Node to free
  *
  * This node has been removed from the tree.  We must now free it and all
  * of its subnodes.  There may be RCU walkers with references into the tree,
  * so we must replace all entries with retry markers.
  */
 static void xas_free_nodes(struct xa_state *xas, struct xa_node *top)
 {
 	unsigned int offset = 0;
 	struct xa_node *node = top;
 
 	for (;;) {
 		void *entry = xa_entry_locked(xas->xa, node, offset);
 
 		if (node->shift && xa_is_node(entry)) {
 			node = xa_to_node(entry);
 			offset = 0;
 			continue;
 		}
 		if (entry)
 			RCU_INIT_POINTER(node->slots[offset], XA_RETRY_ENTRY);
 		offset++;
 		while (offset == XA_CHUNK_SIZE) {
 			struct xa_node *parent;
 
 			parent = xa_parent_locked(xas->xa, node);
 			offset = node->offset + 1;
 			node->count = 0;
 			node->nr_values = 0;
 			xas_update(xas, node);
 			xa_node_free(node);
 			if (node == top)
 				return;
 			node = parent;
 		}
 	}
 }
 
 /*
  * xas_expand adds nodes to the head of the tree until it has reached
  * sufficient height to be able to contain @xas->xa_index
  */
 static int xas_expand(struct xa_state *xas, void *head)
 {
 	struct xarray *xa = xas->xa;
 	struct xa_node *node = NULL;
 	unsigned int shift = 0;
 	unsigned long max = xas_max(xas);
 
 	if (!head) {
 		if (max == 0)
 			return 0;
 		while ((max >> shift) >= XA_CHUNK_SIZE)
 			shift += XA_CHUNK_SHIFT;
 		return shift + XA_CHUNK_SHIFT;
 	} else if (xa_is_node(head)) {
 		node = xa_to_node(head);
 		shift = node->shift + XA_CHUNK_SHIFT;
 	}
 	xas->xa_node = NULL;
 
 	while (max > max_index(head)) {
 		xa_mark_t mark = 0;
 
 		XA_NODE_BUG_ON(node, shift > BITS_PER_LONG);
 		node = xas_alloc(xas, shift);
 		if (!node)
 			return -ENOMEM;
 
 		node->count = 1;
 		if (xa_is_value(head))
 			node->nr_values = 1;
 		RCU_INIT_POINTER(node->slots[0], head);
 
 		/* Propagate the aggregated mark info to the new child */
 		for (;;) {
 			if (xa_track_free(xa) && mark == XA_FREE_MARK) {
 				node_mark_all(node, XA_FREE_MARK);
 				if (!xa_marked(xa, XA_FREE_MARK)) {
 					node_clear_mark(node, 0, XA_FREE_MARK);
 					xa_mark_set(xa, XA_FREE_MARK);
 				}
 			} else if (xa_marked(xa, mark)) {
 				node_set_mark(node, 0, mark);
 			}
 			if (mark == XA_MARK_MAX)
 				break;
 			mark_inc(mark);
 		}
 
 		/*
 		 * Now that the new node is fully initialised, we can add
 		 * it to the tree
 		 */
 		if (xa_is_node(head)) {
 			xa_to_node(head)->offset = 0;
 			rcu_assign_pointer(xa_to_node(head)->parent, node);
 		}
 		head = xa_mk_node(node);
 		rcu_assign_pointer(xa->xa_head, head);
 		xas_update(xas, node);
 
 		shift += XA_CHUNK_SHIFT;
 	}
 
 	xas->xa_node = node;
 	return shift;
 }
 
 /*
  * xas_create() - Create a slot to store an entry in.
  * @xas: XArray operation state.
  * @allow_root: %true if we can store the entry in the root directly
  *
  * Most users will not need to call this function directly, as it is called
  * by xas_store().  It is useful for doing conditional store operations
  * (see the xa_cmpxchg() implementation for an example).
  *
  * Return: If the slot already existed, returns the contents of this slot.
  * If the slot was newly created, returns %NULL.  If it failed to create the
  * slot, returns %NULL and indicates the error in @xas.
  */
 static void *xas_create(struct xa_state *xas, bool allow_root)
 {
 	struct xarray *xa = xas->xa;
 	void *entry;
 	void __rcu **slot;
 	struct xa_node *node = xas->xa_node;
 	int shift;
 	unsigned int order = xas->xa_shift;
 
 	if (xas_top(node)) {
 		entry = xa_head_locked(xa);
 		xas->xa_node = NULL;
 		if (!entry && xa_zero_busy(xa))
 			entry = XA_ZERO_ENTRY;
 		shift = xas_expand(xas, entry);
 		if (shift < 0)
 			return NULL;
 		if (!shift && !allow_root)
 			shift = XA_CHUNK_SHIFT;
 		entry = xa_head_locked(xa);
 		slot = &xa->xa_head;
 	} else if (xas_error(xas)) {
 		return NULL;
 	} else if (node) {
 		unsigned int offset = xas->xa_offset;
 
 		shift = node->shift;
 		entry = xa_entry_locked(xa, node, offset);
 		slot = &node->slots[offset];
 	} else {
 		shift = 0;
 		entry = xa_head_locked(xa);
 		slot = &xa->xa_head;
 	}
 
 	while (shift > order) {
 		shift -= XA_CHUNK_SHIFT;
 		if (!entry) {
 			node = xas_alloc(xas, shift);
 			if (!node)
 				break;
 			if (xa_track_free(xa))
 				node_mark_all(node, XA_FREE_MARK);
 			rcu_assign_pointer(*slot, xa_mk_node(node));
 		} else if (xa_is_node(entry)) {
 			node = xa_to_node(entry);
 		} else {
 			break;
 		}
 		entry = xas_descend(xas, node);
 		slot = &node->slots[xas->xa_offset];
 	}
 
 	return entry;
 }
 
 /**
  * xas_create_range() - Ensure that stores to this range will succeed
  * @xas: XArray operation state.
  *
  * Creates all of the slots in the range covered by @xas.  Sets @xas to
  * create single-index entries and positions it at the beginning of the
  * range.  This is for the benefit of users which have not yet been
  * converted to use multi-index entries.
  */
 void xas_create_range(struct xa_state *xas)
 {
 	unsigned long index = xas->xa_index;
 	unsigned char shift = xas->xa_shift;
 	unsigned char sibs = xas->xa_sibs;
 
 	xas->xa_index |= ((sibs + 1UL) << shift) - 1;
 	if (xas_is_node(xas) && xas->xa_node->shift == xas->xa_shift)
 		xas->xa_offset |= sibs;
 	xas->xa_shift = 0;
 	xas->xa_sibs = 0;
 
 	for (;;) {
 		xas_create(xas, true);
 		if (xas_error(xas))
 			goto restore;
 		if (xas->xa_index <= (index | XA_CHUNK_MASK))
 			goto success;
 		xas->xa_index -= XA_CHUNK_SIZE;
 
 		for (;;) {
 			struct xa_node *node = xas->xa_node;
 			if (node->shift >= shift)
 				break;
 			xas->xa_node = xa_parent_locked(xas->xa, node);
 			xas->xa_offset = node->offset - 1;
 			if (node->offset != 0)
 				break;
 		}
 	}
 
 restore:
 	xas->xa_shift = shift;
 	xas->xa_sibs = sibs;
 	xas->xa_index = index;
 	return;
 success:
 	xas->xa_index = index;
 	if (xas->xa_node)
 		xas_set_offset(xas);
 }
 EXPORT_SYMBOL_GPL(xas_create_range);
 
 static void update_node(struct xa_state *xas, struct xa_node *node,
 		int count, int values)
 {
 	if (!node || (!count && !values))
 		return;
 
 	node->count += count;
 	node->nr_values += values;
 	XA_NODE_BUG_ON(node, node->count > XA_CHUNK_SIZE);
 	XA_NODE_BUG_ON(node, node->nr_values > XA_CHUNK_SIZE);
 	xas_update(xas, node);
 	if (count < 0)
 		xas_delete_node(xas);
 }
 
 /**
  * xas_store() - Store this entry in the XArray.
  * @xas: XArray operation state.
  * @entry: New entry.
  *
  * If @xas is operating on a multi-index entry, the entry returned by this
  * function is essentially meaningless (it may be an internal entry or it
  * may be %NULL, even if there are non-NULL entries at some of the indices
  * covered by the range).  This is not a problem for any current users,
  * and can be changed if needed.
  *
  * Return: The old entry at this index.
  */
 void *xas_store(struct xa_state *xas, void *entry)
 {
 	struct xa_node *node;
 	void __rcu **slot = &xas->xa->xa_head;
 	unsigned int offset, max;
 	int count = 0;
 	int values = 0;
 	void *first, *next;
 	bool value = xa_is_value(entry);
 
 	if (entry) {
 		bool allow_root = !xa_is_node(entry) && !xa_is_zero(entry);
 		first = xas_create(xas, allow_root);
 	} else {
 		first = xas_load(xas);
 	}
 
 	if (xas_invalid(xas))
 		return first;
 	node = xas->xa_node;
 	if (node && (xas->xa_shift < node->shift))
 		xas->xa_sibs = 0;
 	if ((first == entry) && !xas->xa_sibs)
 		return first;
 
 	next = first;
 	offset = xas->xa_offset;
 	max = xas->xa_offset + xas->xa_sibs;
 	if (node) {
 		slot = &node->slots[offset];
 		if (xas->xa_sibs)
 			xas_squash_marks(xas);
 	}
 	if (!entry)
 		xas_init_marks(xas);
 
 	for (;;) {
 		/*
 		 * Must clear the marks before setting the entry to NULL,
 		 * otherwise xas_for_each_marked may find a NULL entry and
 		 * stop early.  rcu_assign_pointer contains a release barrier
 		 * so the mark clearing will appear to happen before the
 		 * entry is set to NULL.
 		 */
 		rcu_assign_pointer(*slot, entry);
 		if (xa_is_node(next) && (!node || node->shift))
 			xas_free_nodes(xas, xa_to_node(next));
 		if (!node)
 			break;
 		count += !next - !entry;
 		values += !xa_is_value(first) - !value;
 		if (entry) {
 			if (offset == max)
 				break;
 			if (!xa_is_sibling(entry))
 				entry = xa_mk_sibling(xas->xa_offset);
 		} else {
 			if (offset == XA_CHUNK_MASK)
 				break;
 		}
 		next = xa_entry_locked(xas->xa, node, ++offset);
 		if (!xa_is_sibling(next)) {
 			if (!entry && (offset > max))
 				break;
 			first = next;
 		}
 		slot++;
 	}
 
 	update_node(xas, node, count, values);
 	return first;
 }
 EXPORT_SYMBOL_GPL(xas_store);
 
 /**
  * xas_get_mark() - Returns the state of this mark.
  * @xas: XArray operation state.
  * @mark: Mark number.
  *
  * Return: true if the mark is set, false if the mark is clear or @xas
  * is in an error state.
  */
 bool xas_get_mark(const struct xa_state *xas, xa_mark_t mark)
 {
 	if (xas_invalid(xas))
 		return false;
 	if (!xas->xa_node)
 		return xa_marked(xas->xa, mark);
 	return node_get_mark(xas->xa_node, xas->xa_offset, mark);
 }
 EXPORT_SYMBOL_GPL(xas_get_mark);
 
 /**
  * xas_set_mark() - Sets the mark on this entry and its parents.
  * @xas: XArray operation state.
  * @mark: Mark number.
  *
  * Sets the specified mark on this entry, and walks up the tree setting it
  * on all the ancestor entries.  Does nothing if @xas has not been walked to
  * an entry, or is in an error state.
  */
 void xas_set_mark(const struct xa_state *xas, xa_mark_t mark)
 {
 	struct xa_node *node = xas->xa_node;
 	unsigned int offset = xas->xa_offset;
 
 	if (xas_invalid(xas))
 		return;
 
 	while (node) {
 		if (node_set_mark(node, offset, mark))
 			return;
 		offset = node->offset;
 		node = xa_parent_locked(xas->xa, node);
 	}
 
 	if (!xa_marked(xas->xa, mark))
 		xa_mark_set(xas->xa, mark);
 }
 EXPORT_SYMBOL_GPL(xas_set_mark);
 
 /**
  * xas_clear_mark() - Clears the mark on this entry and its parents.
  * @xas: XArray operation state.
  * @mark: Mark number.
  *
  * Clears the specified mark on this entry, and walks back to the head
  * attempting to clear it on all the ancestor entries.  Does nothing if
  * @xas has not been walked to an entry, or is in an error state.
  */
 void xas_clear_mark(const struct xa_state *xas, xa_mark_t mark)
 {
 	struct xa_node *node = xas->xa_node;
 	unsigned int offset = xas->xa_offset;
 
 	if (xas_invalid(xas))
 		return;
 
 	while (node) {
 		if (!node_clear_mark(node, offset, mark))
 			return;
 		if (node_any_mark(node, mark))
 			return;
 
 		offset = node->offset;
 		node = xa_parent_locked(xas->xa, node);
 	}
 
 	if (xa_marked(xas->xa, mark))
 		xa_mark_clear(xas->xa, mark);
 }
 EXPORT_SYMBOL_GPL(xas_clear_mark);
 
 /**
  * xas_init_marks() - Initialise all marks for the entry
  * @xas: Array operations state.
  *
  * Initialise all marks for the entry specified by @xas.  If we're tracking
  * free entries with a mark, we need to set it on all entries.  All other
  * marks are cleared.
  *
  * This implementation is not as efficient as it could be; we may walk
  * up the tree multiple times.
  */
 void xas_init_marks(const struct xa_state *xas)
 {
 	xa_mark_t mark = 0;
 
 	for (;;) {
 		if (xa_track_free(xas->xa) && mark == XA_FREE_MARK)
 			xas_set_mark(xas, mark);
 		else
 			xas_clear_mark(xas, mark);
 		if (mark == XA_MARK_MAX)
 			break;
 		mark_inc(mark);
 	}
 }
 EXPORT_SYMBOL_GPL(xas_init_marks);
 
 #ifdef CONFIG_XARRAY_MULTI
 static unsigned int node_get_marks(struct xa_node *node, unsigned int offset)
 {
 	unsigned int marks = 0;
 	xa_mark_t mark = XA_MARK_0;
 
 	for (;;) {
 		if (node_get_mark(node, offset, mark))
 			marks |= 1 << (__force unsigned int)mark;
 		if (mark == XA_MARK_MAX)
 			break;
 		mark_inc(mark);
 	}
 
 	return marks;
 }
 
 static inline void node_mark_slots(struct xa_node *node, unsigned int sibs,
 		xa_mark_t mark)
 {
 	int i;
 
 	if (sibs == 0)
 		node_mark_all(node, mark);
 	else {
 		for (i = 0; i < XA_CHUNK_SIZE; i += sibs + 1)
 			node_set_mark(node, i, mark);
 	}
 }
 
 static void node_set_marks(struct xa_node *node, unsigned int offset,
 			struct xa_node *child, unsigned int sibs,
 			unsigned int marks)
 {
 	xa_mark_t mark = XA_MARK_0;
 
 	for (;;) {
 		if (marks & (1 << (__force unsigned int)mark)) {
]
]

gemini-3.1-pro-preview

							input: 95862
							output: 29
							thoughts: 24
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Xarray Code Navigation: Locating `xas_find`**

Okay, so I need to find the definition of `xas_find`. Given my familiarity with the xarray codebase and its C extensions, I'm going to start by looking within `lib/xarray.c`. That's where I'd expect to find the core implementation details for the C-level data structures and functions that xarray uses, especially if it's a function name I'm not immediately familiar with. I'm assuming it’s a helper or utility function, likely part of how xarray interacts with NumPy arrays and memory management. Let's see what we find.

map[Expression:xas_find PathPrefix:lib/xarray.c]

map[Output:lib/xarray.c=1375=EXPORT_SYMBOL_GPL(__xas_next);
--
lib/xarray.c-1377-/**
lib/xarray.c:1378: * xas_find() - Find the next present entry in the XArray.
lib/xarray.c-1379- * @xas: XArray operation state.
--
lib/xarray.c-1392- */
lib/xarray.c:1393:void *xas_find(struct xa_state *xas, unsigned long max)
lib/xarray.c-1394-{
--
lib/xarray.c-1438-}
lib/xarray.c:1439:EXPORT_SYMBOL_GPL(xas_find);
lib/xarray.c-1440-
lib/xarray.c-1441-/**
lib/xarray.c:1442: * xas_find_marked() - Find the next marked entry in the XArray.
lib/xarray.c-1443- * @xas: XArray operation state.
--
lib/xarray.c-1461- */
lib/xarray.c:1462:void *xas_find_marked(struct xa_state *xas, unsigned long max, xa_mark_t mark)
lib/xarray.c-1463-{
--
lib/xarray.c-1509-
lib/xarray.c:1510:		offset = xas_find_chunk(xas, advance, mark);
lib/xarray.c-1511-		if (offset > xas->xa_offset) {
--
lib/xarray.c-1540-}
lib/xarray.c:1541:EXPORT_SYMBOL_GPL(xas_find_marked);
lib/xarray.c-1542-
lib/xarray.c-1543-/**
lib/xarray.c:1544: * xas_find_conflict() - Find the next present entry in a range.
lib/xarray.c-1545- * @xas: XArray operation state.
--
lib/xarray.c-1551- */
lib/xarray.c:1552:void *xas_find_conflict(struct xa_state *xas)
lib/xarray.c-1553-{
--
lib/xarray.c-1601-}
lib/xarray.c:1602:EXPORT_SYMBOL_GPL(xas_find_conflict);
lib/xarray.c-1603-
--
lib/xarray.c=1985=int __xa_alloc(struct xarray *xa, u32 *id, void *entry,
--
lib/xarray.c-1999-		xas.xa_index = limit.min;
lib/xarray.c:2000:		xas_find_marked(&xas, limit.max, XA_FREE_MARK);
lib/xarray.c-2001-		if (xas.xa_node == XAS_RESTART)
--
lib/xarray.c=2170=EXPORT_SYMBOL(xa_clear_mark);
--
lib/xarray.c-2183- * entries which are being simultaneously added.  It will not return an
lib/xarray.c:2184: * %XA_RETRY_ENTRY; if you need to see retry entries, use xas_find().
lib/xarray.c-2185- *
--
lib/xarray.c=2189=void *xa_find(struct xarray *xa, unsigned long *indexp,
--
lib/xarray.c-2197-		if ((__force unsigned int)filter < XA_MAX_MARKS)
lib/xarray.c:2198:			entry = xas_find_marked(&xas, max, filter);
lib/xarray.c-2199-		else
lib/xarray.c:2200:			entry = xas_find(&xas, max);
lib/xarray.c-2201-	} while (xas_retry(&xas, entry));
--
lib/xarray.c=2210=static bool xas_sibling(struct xa_state *xas)
--
lib/xarray.c-2233- * which are being simultaneously added.  It will not return an
lib/xarray.c:2234: * %XA_RETRY_ENTRY; if you need to see retry entries, use xas_find().
lib/xarray.c-2235- *
--
lib/xarray.c=2239=void *xa_find_after(struct xarray *xa, unsigned long *indexp,
--
lib/xarray.c-2250-		if ((__force unsigned int)filter < XA_MAX_MARKS)
lib/xarray.c:2251:			entry = xas_find_marked(&xas, max, filter);
lib/xarray.c-2252-		else
lib/xarray.c:2253:			entry = xas_find(&xas, max);
lib/xarray.c-2254-
]

gemini-3.1-pro-preview

							input: 97357
							output: 33
							thoughts: 12
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Revisiting `xas_find` Implementation**

Alright, let's circle back to that `xas_find` implementation. I'm getting a nagging feeling, and you know how it is – a small detail can throw the whole thing off, especially in this domain. I want to quickly re-evaluate the core logic – the critical path through the search, the handling of edge cases, any potential for off-by-one errors in indexing, and of course, those tricky corner cases with data alignment and boundary conditions. Is it truly robust under all possible memory configurations? Are we still adhering to the performance targets we set? Given my experience, I need to make sure I haven't glossed over anything significant. This warrants a fresh look with my critical hat on. Let's see if anything jumps out this time.

map[ContextFile:lib/xarray.c Name:xas_find]

map[SourceCode:1377:	/**
1378:	 * xas_find() - Find the next present entry in the XArray.
1379:	 * @xas: XArray operation state.
1380:	 * @max: Highest index to return.
1381:	 *
1382:	 * If the @xas has not yet been walked to an entry, return the entry
1383:	 * which has an index >= xas.xa_index.  If it has been walked, the entry
1384:	 * currently being pointed at has been processed, and so we move to the
1385:	 * next entry.
1386:	 *
1387:	 * If no entry is found and the array is smaller than @max, the iterator
1388:	 * is set to the smallest index not yet in the array.  This allows @xas
1389:	 * to be immediately passed to xas_store().
1390:	 *
1391:	 * Return: The entry, if found, otherwise %NULL.
1392:	 */
1393:	void *xas_find(struct xa_state *xas, unsigned long max)
1394:	{
1395:		void *entry;
1396:	
1397:		if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
1398:			return NULL;
1399:		if (xas->xa_index > max)
1400:			return set_bounds(xas);
1401:	
1402:		if (!xas->xa_node) {
1403:			xas->xa_index = 1;
1404:			return set_bounds(xas);
1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
1417:			if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
1418:				xas->xa_offset = xas->xa_node->offset + 1;
1419:				xas->xa_node = xa_parent(xas->xa, xas->xa_node);
1420:				continue;
1421:			}
1422:	
1423:			entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
1424:			if (xa_is_node(entry)) {
1425:				xas->xa_node = xa_to_node(entry);
1426:				xas->xa_offset = 0;
1427:				continue;
1428:			}
1429:			if (entry && !xa_is_sibling(entry))
1430:				return entry;
1431:	
1432:			xas_next_offset(xas);
1433:		}
1434:	
1435:		if (!xas->xa_node)
1436:			xas->xa_node = XAS_BOUNDS;
1437:		return NULL;
1438:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 98597
							output: 37
							thoughts: 1461
						

**Analyzing Reviewer Feedback on XArray Iteration**

Okay, so the reviewers want me to adjust how we handle the `xas_find()` cursor, specifically regarding how we resynchronize it when encountering non-leaf nodes. The core concern seems to be about the offset calculation, and the interaction with `xas_next_offset()`. Let's break this down systematically.

First, they want to preserve the existing logic for leaf nodes (`!xas->xa_node->shift`), which I'm comfortable with. That part's clear.

Now, for non-leaf nodes (`xas->xa_node->shift`), the original code assumed:

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	} else if (xas->xa_node->shift &&
		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node) - 1;
	}
```

The proposed change essentially states that instead of setting `xas->xa_offset = get_offset(xas->xa_index, xas->xa_node) - 1`, we should set `xas->xa_offset = get_offset(xas->xa_index, xas->xa_node)`. This looks at first glance like a simple adjustment, and that it may introduce a bug.

If we go with this direct assignment, `xas_next_offset()` will then increment it, meaning we'd be skipping the slot containing `xa_index`. That *feels* wrong.

However, the reviewers' specific wording is important: they want to "resynchronize to the node slot *containing* `xa_index`." That word, "containing," is critical. If `xa_index` has been updated (e.g., via `xas_set_update`), the goal of `xas_find()` is to locate the entry *at or after* `xa_index`.  If `xa_index` points into a multi-index entry and we are at a non-leaf node, the relevant slot is precisely `get_offset(xas->xa_index, xas->xa_node)`. By setting `xa_offset` to this, it should work.

The existing code is:

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	}
	xas_next_offset(xas);
```

The potential bug lies when `xa_index` is being updated. Let's say `xa_index = 5`. The old logic calculates: `((5 - 1) & 63) + 1` which is 5. `xas_next_offset` then increments to 6. This leads to a skip. The call to `xas_find` with `xa_index = 5` really means find me the *next present entry at or after* index 5. The old code was buggy and always incremented the index to 6, skipping it. The new proposed change fixes this.

Ah! The penny drops! The reason it's tricky is because `xas_find` is almost always called as part of `xas_for_each`. `xas_find` is only called for the *first* entry. Subsequent entries are retrieved by `xas_next`. This is critical. `xas_find` is, in effect, setting up the *starting* point for a traversal.  The issue arises when a user modifies `xa_index` (i.e. to 5), then it *needs* to find index 5, or if it isn't present, at an index *after* 5.

So, setting `xa_offset = get_offset(xas->xa_index, xas->xa_node)` synchronizes the cursor to the desired slot, and `xas_next_offset()` takes care of the increment for the next iteration if the correct slot is present. That is the correct fix.

log-in to see details

map[ContextFile:include/linux/xarray.h Name:xas_for_each]

map[SourceCode: SourceFile:]

gemini-3.1-pro-preview

							input: 101087
							output: 34
							thoughts: 23
						

Here's my take on those thoughts:

**XArray Investigation Begins**

Okay, time to dive into the XArray code again. I need to refresh my memory on `xas_for_each`, so the first step is to locate its definition. Let's start by searching for `xas_for_each` in `include/linux/xarray.h`. That header file is the logical place to begin, given that it houses the core definitions and data structures related to the XArray implementation within the Linux kernel. Hopefully, the declaration or some explanatory comments are in there. From that point I can begin to work my way through the code.

map[Expression:define xas_for_each PathPrefix:include/linux/xarray.h]

map[Output:include/linux/xarray.h=1800=enum {
--
include/linux/xarray.h-1816- */
include/linux/xarray.h:1817:#define xas_for_each(xas, entry, max) \
include/linux/xarray.h-1818-	for (entry = xas_find(xas, max); entry; \
--
include/linux/xarray.h-1834- */
include/linux/xarray.h:1835:#define xas_for_each_marked(xas, entry, max, mark) \
include/linux/xarray.h-1836-	for (entry = xas_find_marked(xas, max, mark); entry; \
--
include/linux/xarray.h-1850- */
include/linux/xarray.h:1851:#define xas_for_each_conflict(xas, entry) \
include/linux/xarray.h-1852-	while ((entry = xas_find_conflict(xas)))
]

gemini-3.1-pro-preview

							input: 101548
							output: 35
							thoughts: 101
						

Okay, here's my understanding, assuming I'm well-versed in this code:

**Analyzing the `xas_for_each` Macro**

Hmm, so `xas_for_each` is built on top of `xas_find` and `xas_next`. I'm trying to get a clear picture of how it iterates. My initial thought was that it probably used `xas_find` for the very first entry, which makes sense. Then, I assumed it would leverage `xas_next` for all subsequent iterations.

But hang on... Let's look at the macro itself:

```c
#define xas_for_each(xas, entry, max) \
	for (entry = xas_find(xas, max); entry; \
	     entry = xas_next(xas))
```

Aha! It's clear now. The first part uses `xas_find`, which is what I suspected. The critical piece, though, is the loop's update expression: `entry = xas_next(xas)`. Now, I have to ask myself, what does `xas_next` do? Is it calling `xas_find` again inside? That's what I need to verify. My gut feeling is now yes, but I need to make sure to confirm. If it's *repeatedly* calling `xas_find`, there might be some performance implications I need to consider, especially with larger datasets. I need to dig into the implementation of `xas_next` to be certain.

map[ContextFile:include/linux/xarray.h Name:xas_next]

map[SourceCode:1886:	/**
1887:	 * xas_next() - Move state to next index.
1888:	 * @xas: XArray operation state.
1889:	 *
1890:	 * If the @xas was in an error state, it will remain in an error state
1891:	 * and this function will return %NULL.  If the @xas has never been walked,
1892:	 * it will have the effect of calling xas_load().  Otherwise one will be
1893:	 * added to the index and the state will be walked to the correct
1894:	 * location in the array for the next operation.
1895:	 *
1896:	 * If the iterator was referencing index %ULONG_MAX, this function wraps
1897:	 * around to 0.
1898:	 *
1899:	 * Return: The entry at the new index.  This may be %NULL or an internal
1900:	 * entry.
1901:	 */
1902:	static inline void *xas_next(struct xa_state *xas)
1903:	{
1904:		struct xa_node *node = xas->xa_node;
1905:	
1906:		if (unlikely(xas_not_node(node) || node->shift ||
1907:					xas->xa_offset == XA_CHUNK_MASK))
1908:			return __xas_next(xas);
1909:	
1910:		xas->xa_index++;
1911:		xas->xa_offset++;
1912:		return xa_entry(xas->xa, node, xas->xa_offset);
1913:	}
 SourceFile:include/linux/xarray.h]

gemini-3.1-pro-preview

							input: 102482
							output: 34
							thoughts: 78
						

Here's my summary, as though I'm thinking through this code snippet:

**Diving into the `xas_for_each` Macro**

Okay, so I see `xas_for_each` in this code, and my immediate reaction is to go straight to the definition. Let's make sure I'm crystal clear on how this thing works. The macro itself is defined as:

```c
#define xas_for_each(xas, entry, max) \
	for (entry = xas_find(xas, max); entry; \
	     entry = xas_find(xas, max))
```

Alright, this is interesting. It's essentially a `for` loop, which isn't surprising, given the naming. The crucial thing here is `xas_find`. It's used within the loop's initialization *and* its iterative step. That means `xas_find` is *doing* something significant each time around. I know `xas` is the XArray data structure and `max` provides a maximum bound, so it's a bit of an iterator. The loop continues as long as `xas_find` returns a non-NULL `entry`. This means the loop iterates through each valid entry retrieved using `xas_find` until it hits a NULL (end of the XArray) value. My instinct is that this is similar to the more modern `for_each` functionality. This should be an efficient way to iterate through potentially sparse arrays within the XArray. This structure likely allows us to efficiently iterate over a set of non-contiguous data within the XArray.

map[Expression:define xas_for_each PathPrefix:include/linux/xarray.h]

map[Output:include/linux/xarray.h=1800=enum {
--
include/linux/xarray.h-1816- */
include/linux/xarray.h:1817:#define xas_for_each(xas, entry, max) \
include/linux/xarray.h-1818-	for (entry = xas_find(xas, max); entry; \
--
include/linux/xarray.h-1834- */
include/linux/xarray.h:1835:#define xas_for_each_marked(xas, entry, max, mark) \
include/linux/xarray.h-1836-	for (entry = xas_find_marked(xas, max, mark); entry; \
--
include/linux/xarray.h-1850- */
include/linux/xarray.h:1851:#define xas_for_each_conflict(xas, entry) \
include/linux/xarray.h-1852-	while ((entry = xas_find_conflict(xas)))
]

gemini-3.1-pro-preview

							input: 103204
							output: 35
							thoughts: 18
						

Okay, here's my attempt at summarizing the thought process, as requested, geared toward an expert audience, and written in the first person:

**Full Macro Examination Required**

Damn it, the output from grepper got cut off! I was hoping for a quick answer, but I'm going to need the entire macro definition. It looks like the relevant code snippet isn't showing up in full. So, let's step back, and find the whole damn thing. I need to understand the complete context. No point trying to diagnose a problem, or even *begin* to understand the intention, if I'm only seeing part of the picture. Alright, let's grab the full macro. Time to dig deeper and see what's really going on in there.

map[Expression:define xas_for_each\( PathPrefix:include/linux/xarray.h]

map[Output:include/linux/xarray.h=1800=enum {
--
include/linux/xarray.h-1816- */
include/linux/xarray.h:1817:#define xas_for_each(xas, entry, max) \
include/linux/xarray.h-1818-	for (entry = xas_find(xas, max); entry; \
]

gemini-3.1-pro-preview

							input: 103526
							output: 37
							thoughts: 22
						

Here's my summary, as if I were thinking these thoughts:

**Diving into the XArray Implementation**

Okay, time to get my hands dirty. I want to zero in on the `include/linux/xarray.h` header file. Specifically, I'm thinking, let's jump right to around line 1817. I'm guessing that area will likely deal with a particular function or data structure I need to examine more closely to understand some recent performance quirks I've been seeing. I'm hoping to get a clearer picture of how a certain aspect of the XArray is actually working under the hood. It could be related to concurrency, memory management, or maybe even just the details of a specific operation. Let's see what line 1817 has to offer.

map[File:include/linux/xarray.h FirstLine:1815 LineCount:10]

map[Contents:1815:	 * xas_pause() first.
1816:	 */
1817:	#define xas_for_each(xas, entry, max) \
1818:		for (entry = xas_find(xas, max); entry; \
1819:		     entry = xas_next_entry(xas, max))
1820:	
1821:	/**
1822:	 * xas_for_each_marked() - Iterate over a range of an XArray.
1823:	 * @xas: XArray operation state.
1824:	 * @entry: Entry retrieved from the array.
]

gemini-3.1-pro-preview

							input: 103929
							output: 37
							thoughts: 26
						

Here's my attempt at summarizing the thought process, tailored for an expert audience and written in the first person:

**Navigating the XAS Data Structure**

Okay, so I'm looking at `xas_next_entry(xas, max)`. The function name itself is a pretty good clue, suggesting I'm iterating through something, likely a hash array structure, based on the "xas" prefix, which I recognize. This `xas` is presumably a handle or pointer to the data structure in question. The `max` argument hints at a boundary condition, indicating the maximum allowable index or key value that I should consider during iteration. This is helpful to understand in this context, as I am trying to determine the structure of the data. I anticipate this function should return either the next valid entry, or a sentinel value if it has reached the end or exceeded the `max` boundary. I'll need to double-check the definition to be sure. It could also potentially modify some internal state within the `xas` structure to track the iteration progress, so I need to keep that in mind.

map[ContextFile:include/linux/xarray.h Name:xas_next_entry]

map[SourceCode:1706:	/**
1707:	 * xas_next_entry() - Advance iterator to next present entry.
1708:	 * @xas: XArray operation state.
1709:	 * @max: Highest index to return.
1710:	 *
1711:	 * xas_next_entry() is an inline function to optimise xarray traversal for
1712:	 * speed.  It is equivalent to calling xas_find(), and will call xas_find()
1713:	 * for all the hard cases.
1714:	 *
1715:	 * Return: The next present entry after the one currently referred to by @xas.
1716:	 */
1717:	static inline void *xas_next_entry(struct xa_state *xas, unsigned long max)
1718:	{
1719:		struct xa_node *node = xas->xa_node;
1720:		void *entry;
1721:	
1722:		if (unlikely(xas_not_node(node) || node->shift ||
1723:				xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)))
1724:			return xas_find(xas, max);
1725:	
1726:		do {
1727:			if (unlikely(xas->xa_index >= max))
1728:				return xas_find(xas, max);
1729:			if (unlikely(xas->xa_offset == XA_CHUNK_MASK))
1730:				return xas_find(xas, max);
1731:			entry = xa_entry(xas->xa, node, xas->xa_offset + 1);
1732:			if (unlikely(xa_is_internal(entry)))
1733:				return xas_find(xas, max);
1734:			xas->xa_offset++;
1735:			xas->xa_index++;
1736:		} while (!entry);
1737:	
1738:		return entry;
1739:	}
 SourceFile:include/linux/xarray.h]

gemini-3.1-pro-preview

							input: 104788
							output: 35
							thoughts: 1514
						

**Analyzing the XArray Iteration Logic**

Okay, so I'm digging into how `xas_next_entry` and `xas_find` interact within the XArray implementation. It seems like the core issue revolves around correctly advancing the search index (`xa_index` and `xa_offset`) during iteration, especially when a new search starts (e.g. `xas_set` is called) or a search resumes.

Initially, `xas_next_entry` checks if `xa_offset` and `xa_index` are synchronized. If not, it calls `xas_find`. `xas_find`'s behavior hinges on whether the search has already "started". If `xa_index` has been modified *and* the offset is out of sync, `xas_find` kicks in to realign things.

The first key observation is that when `xa_index` is modified, but the offset is incorrect, the `else if` block in `xas_find` does a subtle, and somewhat unexpected, adjustment. Specifically, if `xa_index` is, say, 5, `xa_offset` is set to `((5 - 1) & 63) + 1` which is also 5.

Then, `xas_next_offset` gets called, and *this* is where the confusion comes in. It increments `xa_offset`, and then updates `xa_index`. Now, it should be incrementing to 6, right? But the intention is to find the *next* entry, so why increment at all?

The documentation of `xas_find` states that if the search has not yet started, it'll find an entry whose index is >= `xas.xa_index`. Otherwise, it finds the next one. This means the `xas_next_offset` call, in the case of a new index being set is the thing that really increments to the next available index.

Let's say `xa_index` is set to 5. `xas_find` then does the `((5 - 1) & 63) + 1` calculation. Then `xas_next_offset` comes along, increments `xa_offset` to 6 and updates `xa_index` to match. Then we start searching from index 6.

Let's assume we initialize to 0. It sets `xa_offset` to `((0 - 1) & 63) + 1` = 65. So, then when `xas_next_offset` increments it to 66, it skips the entire chunk. But why?

I'm starting to think about this in the context of `xas_for_each`. I realize `xas_find` isn't the first function called. `xas_for_each` is. `xas_for_each` calls `xas_find`, which returns the next entry, or `NULL` if it runs out of entries. Usually, we'd use `xas_set` to start a search. If we call `xas_set(xas, 0)`, the `xas->xa_node` is `NULL`.

If `xas->xa_node` is `NULL`, `xas_find` tries to return `NULL` to `xas_for_each`.
However, let's consider this `if (!xas->xa_node)` check and its implications. If `xa_node` is `NULL`, either the array is empty, or the search hasn't started. The initial condition for `XA_STATE` is `xa_node = NULL`. If the array is empty, `xas_find` should return `NULL`, and `xas_for_each`'s loop wouldn't run.

I need to confirm if this `xa_node` is `NULL` initialization is actually correct or if `xas_for_each` is behaving as I expect it to. Going back to `xas_find`: if `xa_node` is `NULL`, it *does* return `NULL`.

So, `xas_for_each` starts with `xas_find`. If `xa_node` is `NULL`, `xas_find` returns `NULL`. But... how does the loop work?
Looking at `xas_find` again: the case where `xa_node` is `NULL` causes the loop to simply never execute. If `xa_node` is not `NULL` and `xa_node` is `XAS_RESTART`, then it'll jump into some other logic.

I need to trace back from `XA_STATE` initialization, to understand when the first valid entry is returned to `xas_for_each`. It seems I'm missing something fundamental about the initial state.

log-in to see details

map[ContextFile:include/linux/xarray.h Name:XA_STATE]

map[SourceCode: SourceFile:]

gemini-3.1-pro-preview

							input: 107376
							output: 33
							thoughts: 21
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Investigating `XA_STATE` in the Linux XArray Implementation**

Alright, let's dive into the `xarray.h` header file within the Linux kernel source. My goal is to get a clearer understanding of how the `XA_STATE` structure works. I need to refresh my memory on the details of xarray operations, and how to use it. I'll search for the macro `XA_STATE` within that file. This macro likely plays a crucial role in managing the traversal or manipulation of the xarray. My hypothesis is that it's probably used in defining the states that are being set during operations or provides the foundation for indexing/iteration. Understanding it is critical for comprehending the underlying mechanics of the xarray, so it's the right place to begin exploring the implementation details. Let's see what we find.

map[Expression:define XA_STATE PathPrefix:include/linux/xarray.h]

map[Output:include/linux/xarray.h=1354=struct xa_state {
--
include/linux/xarray.h-1395- */
include/linux/xarray.h:1396:#define XA_STATE(name, array, index)				\
include/linux/xarray.h-1397-	struct xa_state name = __XA_STATE(array, index, 0, 0)
--
include/linux/xarray.h-1409- */
include/linux/xarray.h:1410:#define XA_STATE_ORDER(name, array, index, order)		\
include/linux/xarray.h-1411-	struct xa_state name = __XA_STATE(array,		\
]

gemini-3.1-pro-preview

							input: 107823
							output: 36
							thoughts: 10
						

Okay, here's my interpretation of "Let's see `__XA_STATE`," summarized in the first person, assuming a technical expert is reading:

**Examining the Transactional State**

Alright, let's take a look at that `__XA_STATE` variable, shall we? My immediate thought is, "Ah, right, we're talking about XA transactions." That's a classic distributed transaction state indicator. I know exactly what this represents: the current state of a global transaction managed under the XA standard. Depending on where I am in my analysis, this could be *super* helpful, or simply the confirmation I needed to understand the current transaction. Depending on the system, this could indicate a lot - is the transaction prepared? In a commit phase? Rollback initiated? Understanding this variable could give me an insight into the root of an issue. Is it stalled? Is it waiting on another resource manager? Knowing the state quickly directs my troubleshooting. Now, where is it being set, and what are the possible values? Let's get to the bottom of this.

log-in to see details

map[ContextFile:include/linux/xarray.h Name:__XA_STATE]

map[SourceCode: SourceFile:]

gemini-3.1-pro-preview

							input: 108119
							output: 33
							thoughts: 11
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Grep'ing for XA State**

Alright, let's get down to brass tacks. My initial instinct, when faced with a situation involving transaction state, is to immediately reach for the grep. I need to understand the codebase. `__XA_STATE` is my target. It's a fairly safe bet that this is a key internal variable or define related to XA transaction management. 

I'm thinking, "Where is this defined? Where is it used? What functions read and write it?" My mental model is already forming the execution flow I expect. I'm anticipating finding it in header files, potentially within structures related to XA resource managers, transaction coordinators, or perhaps even in the core transaction management library itself. The grep will quickly help me establish the context. The goal here isn't just to *find* it, but to quickly map out its usage and understand its *meaning* within the system. Is it an enum? A bitfield? A simple integer? And how is it synchronized? I expect to look for things like mutexes, atomic operations, or other concurrency primitives in its usage.

Once I've got a list of the matches, I can start to understand the state machine, or at least the part of it that concerns XA. This is a very targeted approach to understand a very specific, but very important, part of the logic that I am curious about.

map[Expression:define __XA_STATE PathPrefix:include/linux/xarray.h]

map[Output:include/linux/xarray.h=1354=struct xa_state {
--
include/linux/xarray.h-1374-
include/linux/xarray.h:1375:#define __XA_STATE(array, index, shift, sibs)  {	\
include/linux/xarray.h-1376-	.xa = array,					\
]

gemini-3.1-pro-preview

							input: 108582
							output: 37
							thoughts: 10
						

Okay, here's my interpretation of that thought process, assuming I'm deep in my domain of expertise:

**Diving into the __XA_STATE Variable**

Alright, time to crack this open. "Let's read `__XA_STATE`." That's a clear directive, and honestly, the thought barely needs elaboration. My mind immediately shifts gears, prepping for the nuances of distributed transaction management. `__XA_STATE`... it's the heartbeat of the XA protocol, the critical variable holding the transaction's current status. No time for preamble, let's get into the nitty-gritty. I'm already anticipating what I'm looking for - understanding the exact state, its implications on the ongoing transaction, and what potential issues might be lurking within it. This is where the rubber meets the road.

map[File:include/linux/xarray.h FirstLine:1375 LineCount:10]

map[Contents:1375:	#define __XA_STATE(array, index, shift, sibs)  {	\
1376:		.xa = array,					\
1377:		.xa_index = index,				\
1378:		.xa_shift = shift,				\
1379:		.xa_sibs = sibs,				\
1380:		.xa_offset = 0,					\
1381:		.xa_pad = 0,					\
1382:		.xa_node = XAS_RESTART,				\
1383:		.xa_alloc = NULL,				\
1384:		.xa_update = NULL,				\
]

gemini-3.1-pro-preview

							input: 108996
							output: 35
							thoughts: 1496
						

**Analyzing the xa_state Restart and Offset Handling**

Okay, so I'm diving into this `xa_node` initialization with `XAS_RESTART`. My initial thought is that if `xa_node` is `XAS_RESTART`, `xas_find` calls `xas_load`. If `xas_load` returns an entry, great, it returns it. If it returns `NULL` *and* `xas_not_node` is true, it still returns `NULL`. But if `xas_load` is `NULL` and `xa_node` is valid, it means a `NULL` entry at `xa_index`, but there are more entries in the node, so it falls into `xas_next_offset`.

Now, if it falls through, `xa_offset` has whatever `xas_load` set it to. `xas_load` sets it to the result of `get_offset(xa_index, node)`. Then `xas_next_offset` increments `xa_offset` and updates `xa_index`. So, if `xa_index` was 5 and the entry at 5 is `NULL`, `xas_load` sets `xa_offset` to 5, and `xas_next_offset` increments it to 6. Bingo! It starts searching from 6, which is what we want – the *next* present entry.

But here's a wrinkle: what if `xa_index` is *modified* after `xas_load`?  For example, within a `xas_for_each` loop. `xas_next_entry` is called. If `xa_index` is modified inside the loop (e.g., via `xas_set(xas, 10)`), then `xas_next_entry` is called again. `xas_next_entry` checks `xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)`. If they don't match, it calls `xas_find`.

In `xas_find`, the `xa_node` is still the same, valid node. So it hits this specific check:

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	}
```

If `xa_index` is set to 10, then `(10 - 1) & 63` is 9, plus 1 is 10. `xas_next_offset` then increments it to 11.

Wait. If `xa_index` is set to 10, we want to find the entry at index >= 10. *Why* does it increment to 11? `((10 - 1) & 63) + 1` should be 10, so why the increment? Oh! I see, `xas_next_offset` increments `xa_offset` *before* checking the entry in `xas_find`.

So, here's the full picture: `xas_find` calls `xas_next_offset`. `xas_next_offset` increments `xa_offset` which is then used to look up the entry. If `xa_offset` was set to 10, `xas_next_offset` makes it 11, and `xas_find` checks entry 11! It skips entry 10.

Is this correct?

Let's trace: If `xa_index` is set to 10,  `xa_offset` becomes `((10 - 1) & 63) + 1` which is 10. `xas_next_offset` is called and `xa_offset` becomes 11. `xas_find` then checks entry 11!  This looks wrong.  If `xa_index` is 10 and we want index >= 10, it *should* check 10 first! Why is it skipping?

Ah!  It's the `xas_next_entry` call at the *end* of the loop that triggers this behavior. If the *user* sets `xa_index` to 10 inside the loop, the entry *they wanted* would have already been processed in the *current* iteration!  If the user sets `xa_index` to 10, they want the *next* iteration to process an index >= 10. If they do want to process index >= 10, and they *set* the

map[ContextFile:include/linux/xarray.h Name:xas_set]

map[SourceCode:1634:	/**
1635:	 * xas_set() - Set up XArray operation state for a different index.
1636:	 * @xas: XArray operation state.
1637:	 * @index: New index into the XArray.
1638:	 *
1639:	 * Move the operation state to refer to a different index.  This will
1640:	 * have the effect of starting a walk from the top; see xas_next()
1641:	 * to move to an adjacent index.
1642:	 */
1643:	static inline void xas_set(struct xa_state *xas, unsigned long index)
1644:	{
1645:		xas->xa_index = index;
1646:		xas->xa_node = XAS_RESTART;
1647:	}
 SourceFile:include/linux/xarray.h]

gemini-3.1-pro-preview

							input: 111801
							output: 35
							thoughts: 421
						

**My Analysis of the XArray Implementation**

Okay, let's break this down. So, `xas_set` is setting `xa_node` to `XAS_RESTART`. Right, that makes sense. Now, if `xa_node` *is* `XAS_RESTART`, then `xas_find` handles it with that `else if` block. It calls `xas_load`. Aha, `xas_load` sets `xa_offset` to 10. And it checks *entry 10* directly. Okay, so it *does* jump directly to offset 10 and checks.

Now, I need to figure out when that other `else if` condition in `xas_find` gets hit: `else if (!xas->xa_node->shift && xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK))`. That's the one I need to understand better. It must be when `xa_index` has been modified *without* also setting `xa_node` to `XAS_RESTART`. Got it.

So, when does that happen? Let's trace it back. Ah, here it is: `xas_next_entry`. That increments *both* `xa_index` and `xa_offset`. But what if something else modified `xa_index` independently? Something that *didn't* trigger the `XAS_RESTART` flag. Hmmm... thinking, thinking... `xas_pause`! That's it! If `xas_pause` (or anything else) messes with `xa_index` without the appropriate restart, then the `xas_find`'s other conditional will trigger. I need to investigate how `xas_pause` modifies `xa_index`. That's where the inconsistency lies.

map[ContextFile:include/linux/xarray.h Name:xas_pause]

map[SourceCode:1260:	/**
1261:	 * xas_pause() - Pause a walk to drop a lock.
1262:	 * @xas: XArray operation state.
1263:	 *
1264:	 * Some users need to pause a walk and drop the lock they're holding in
1265:	 * order to yield to a higher priority thread or carry out an operation
1266:	 * on an entry.  Those users should call this function before they drop
1267:	 * the lock.  It resets the @xas to be suitable for the next iteration
1268:	 * of the loop after the user has reacquired the lock.  If most entries
1269:	 * found during a walk require you to call xas_pause(), the xa_for_each()
1270:	 * iterator may be more appropriate.
1271:	 *
1272:	 * Note that xas_pause() only works for forward iteration.  If a user needs
1273:	 * to pause a reverse iteration, we will need a xas_pause_rev().
1274:	 */
1275:	void xas_pause(struct xa_state *xas)
1276:	{
1277:		struct xa_node *node = xas->xa_node;
1278:	
1279:		if (xas_invalid(xas))
1280:			return;
1281:	
1282:		xas->xa_node = XAS_RESTART;
1283:		if (node) {
1284:			unsigned long offset = xas->xa_offset;
1285:			while (++offset < XA_CHUNK_SIZE) {
1286:				if (!xa_is_sibling(xa_entry(xas->xa, node, offset)))
1287:					break;
1288:			}
1289:			xas->xa_index &= ~0UL << node->shift;
1290:			xas->xa_index += (offset - xas->xa_offset) << node->shift;
1291:			if (xas->xa_index == 0)
1292:				xas->xa_node = XAS_BOUNDS;
1293:		} else {
1294:			xas->xa_index++;
1295:		}
1296:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 113271
							output: 33
							thoughts: 1418
						

**Analyzing the XArray Logic and Potential Synchronization Issues**

Okay, so I'm trying to figure out this XArray code and there's a specific scenario bugging me, so let's walk through it. My initial thought was that `xas_pause` might be the culprit, setting `xa_node = XAS_RESTART`, but that's not it. `xas_set_update` is for callbacks, which is not relevant.  What about `xas_split`? That seems more promising, given the reviewers' comments.

The core of the issue stems from this comment: "For non-leaf nodes, resynchronize the `xas_find()` cursor to the node slot containing `xa_index`." I need to understand when `xa_index` gets modified and when the node isn't synchronized. If `xa_node` is a non-leaf and `xa_index` is changed, how is `xa_node` not `XAS_RESTART`? 

Aha, the key is the workflow. If `xas_find` is called, and `xa_node` is a non-leaf, we're in the middle of a walk and `xa_index` has been modified! So let's look at `xas_find`. I'm going to follow the code as it traverses the tree using `xas_next_offset` and `xa_parent`, to visualize how it works.

I see the main loop in `xas_find`:

```c
	while (xas->xa_node && (xas->xa_index <= max)) {
		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
			xas->xa_offset = xas->xa_node->offset + 1;
			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
			continue;
		}

		entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
		if (xa_is_node(entry)) {
			xas->xa_node = xa_to_node(entry);
			xas->xa_offset = 0;
			continue;
		}
		if (entry && !xa_is_sibling(entry))
			return entry;

		xas_next_offset(xas);
	}
```

Okay, if `xa_node` isn't a leaf, then `xas_find` walks down the tree. It sets `xa_node` to a non-leaf node, and resets the offset. So, it can be a non-leaf! Now, I need to see how `xas_find` interacts with `xas_next_entry`. The crux here is that `xas_next_entry` only calls `xas_find` if it's NOT a leaf, or if `xa_offset` is not what it should be. The key line:

```c
	if (unlikely(xas_not_node(node) || node->shift ||
			xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)))
		return xas_find(xas, max);
```

So, If `node->shift != 0`, then we call `xas_find`. What does `xas_find` do then?

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	}
```

It checks if it's a leaf. If it ISN'T, it skips the `else if`! Then it calls `xas_next_offset`. `xas_next_offset` increments `xa_offset` and updates `xa_index`. Bingo! I have it. If `node->shift != 0`, `xas_next_entry` is calling `xas_find` because the node is a non-leaf. This means we are inside a multi-index entry, and `xa_node` is a non-leaf node. Because of the multi-index setup, the data might be stored at a non-leaf node. Then `xas_next_entry` calls `xas_find`. In `xas_find`, we call `xas_next_offset`. `xas_next_offset` moves to the next entry in this non-leaf node, which looks correct.

BUT... here's the kicker. What if the user modified `xa_index` directly without using `xas_set`? If the user changed `xa

map[ContextFile:lib/xarray.c Name:xas_split]

map[SourceCode:1075:	/**
1076:	 * xas_split() - Split a multi-index entry into smaller entries.
1077:	 * @xas: XArray operation state.
1078:	 * @entry: New entry to store in the array.
1079:	 * @order: Current entry order.
1080:	 *
1081:	 * The size of the new entries is set in @xas.  The value in @entry is
1082:	 * copied to all the replacement entries.
1083:	 *
1084:	 * Context: Any context.  The caller should hold the xa_lock.
1085:	 */
1086:	void xas_split(struct xa_state *xas, void *entry, unsigned int order)
1087:	{
1088:		unsigned int sibs = (1 << (order % XA_CHUNK_SHIFT)) - 1;
1089:		unsigned int offset, marks;
1090:		struct xa_node *node;
1091:		void *curr = xas_load(xas);
1092:		int values = 0;
1093:	
1094:		node = xas->xa_node;
1095:		if (xas_top(node))
1096:			return;
1097:	
1098:		marks = node_get_marks(node, xas->xa_offset);
1099:	
1100:		offset = xas->xa_offset + sibs;
1101:		do {
1102:			if (xas->xa_shift < node->shift) {
1103:				struct xa_node *child = xas->xa_alloc;
1104:	
1105:				xas->xa_alloc = rcu_dereference_raw(child->parent);
1106:				child->shift = node->shift - XA_CHUNK_SHIFT;
1107:				child->offset = offset;
1108:				child->count = XA_CHUNK_SIZE;
1109:				child->nr_values = xa_is_value(entry) ?
1110:						XA_CHUNK_SIZE : 0;
1111:				RCU_INIT_POINTER(child->parent, node);
1112:				node_set_marks(node, offset, child, xas->xa_sibs,
1113:						marks);
1114:				rcu_assign_pointer(node->slots[offset],
1115:						xa_mk_node(child));
1116:				if (xa_is_value(curr))
1117:					values--;
1118:				xas_update(xas, child);
1119:			} else {
1120:				unsigned int canon = offset - xas->xa_sibs;
1121:	
1122:				node_set_marks(node, canon, NULL, 0, marks);
1123:				rcu_assign_pointer(node->slots[canon], entry);
1124:				while (offset > canon)
1125:					rcu_assign_pointer(node->slots[offset--],
1126:							xa_mk_sibling(canon));
1127:				values += (xa_is_value(entry) - xa_is_value(curr)) *
1128:						(xas->xa_sibs + 1);
1129:			}
1130:		} while (offset-- > xas->xa_offset);
1131:	
1132:		node->nr_values += values;
1133:		xas_update(xas, node);
1134:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 116722
							output: 229
							thoughts: 1629
						

**Analyzing the XArray Logic and Incorporating Reviewer Feedback**

Okay, so I'm diving back into this XArray code, specifically the `xas_split` path. My initial thought is that I need to clarify the interaction between `xas_split` and the cursor movement, particularly concerning how we handle multi-index entries. The crux of the issue revolves around correctly advancing the cursor after a split, which the reviewers pointed out.

Looking at the original patch, I see the problematic code:

```c
-	} else if (!xas->xa_node->shift &&
-		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
-		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;
 	}
 ```

The reviewers have a strong opinion here, specifying very clearly, "For non-leaf nodes, resynchronize the `xas_find()` cursor to the node slot containing `xa_index` (using `get_offset(xas->xa_index, xas->xa_node)`) before the existing `xas_next_offset()` call, instead of using `get_offset(xa_index - 1, node) + 1`."

So I need to incorporate those details, and I *think* I see the problem. The reviewers want this change:

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	} else if (xas->xa_node->shift &&
		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node) - 1;
	}
```

Now, hold on. The code suggests decrementing `xa_offset` by 1. That's *almost* right, but that's not what the reviewers want, is it? Setting it to `get_offset(...) - 1`, and then `xas_next_offset` gets called, it would increment it to *exactly* what the reviewers *don't* want: `get_offset(...)`.

The reviewers want `get_offset(xas->xa_index, xas->xa_node)` before `xas_next_offset`, which increments the offset by one. Let me think this through. If `xa_index` has advanced, and we're at a non-leaf node, then the entry at `xa_offset` is a node. If `xas_find` is called again at a non-leaf node, this means the cursor is iterating over a multi-index entry and that we must find the NEXT entry. Thus, we should search from the NEXT slot!

The reviewers said, "resynchronize the `xas_find()` cursor to the node slot containing `xa_index` (using `get_offset(xas->xa_index, xas->xa_node)`) before the existing `xas_next_offset()` call". They want us to set `xa_offset = get_offset(xas->xa_index, xas->xa_node)` and then `xas_next_offset` will be called which increments it to `get_offset(...) + 1`. This makes perfect sense! `xa_index` is pointing to the multi-index entry, we need the NEXT entry, so the NEXT slot.

So, the CORRECT code is:

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	} else if (xas->xa_node->shift &&
		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
	}
```

This *exactly* aligns with the reviewers' request to "resynchronize the `

map[CurrentCode:	} else if (xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
		xas->xa_offset = get_offset(xas->xa_index - 1, xas->xa_node) + 1;
	} NewCode:	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	} else if (xas->xa_node->shift &&
		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
	} SourceFile:lib/xarray.c]

map[]

gemini-3.1-pro-preview

							input: 119612
							output: 35
							thoughts: 104
						

**Adding Deterministic Coverage to Xarray Tests**

Okay, so the reviewers want me to focus on adding some specific test coverage to `lib/test_xarray.c`. They're particularly interested in two edge cases: the order-7 adjacent entry scenario and what happens when you split a multi-index entry mid-lookup. I see, they want to ensure these are thoroughly tested, and I agree. These are the kinds of cases that can sneak up on you with complex data structures.

The instruction is clear: I need to create a new helper function, `check_multi_find_4()`, inside `lib/test_xarray.c` to handle both of these situations. Then, I'll need to call this new helper from within `check_find()`, which is a good, logical place for it. That makes sense, keeping the testing organized and easy to follow. Alright, time to dive into `lib/test_xarray.c` and get this implemented. This is a solid plan to improve the robustness of the Xarray code.

log-in to see details

map[ContextFile:lib/test_xarray.c Name:check_find]

map[SourceCode: SourceFile:]

gemini-3.1-pro-preview

							input: 119996
							output: 31
							thoughts: 21
						

Here's my thought process, summarized as you requested:

**Investigating a Potential Issue in the Xarray Testing Library**

Okay, so I need to dig into the Xarray testing code, and a specific function name has come to mind: `check_find`. To get started, my immediate thought is to use `grep`. I'll run `grep` to search for the string `check_find`. This search will be performed within the `lib/test_xarray.c` file. This is my initial plan to quickly locate all instances of this particular function, or even just instances where the string `check_find` is present. This will provide some quick context, and possibly where the function is used, and in what tests, which is a good starting point.

map[Expression:check_find PathPrefix:lib/test_xarray.c]

map[Output:lib/test_xarray.c=1236=static noinline void check_multi_find_3(struct xarray *xa)
--
lib/test_xarray.c-1249-
lib/test_xarray.c:1250:static noinline void check_find_1(struct xarray *xa)
lib/test_xarray.c-1251-{
--
lib/test_xarray.c-1297-
lib/test_xarray.c:1298:static noinline void check_find_2(struct xarray *xa)
lib/test_xarray.c-1299-{
--
lib/test_xarray.c-1318-
lib/test_xarray.c:1319:static noinline void check_find_3(struct xarray *xa)
lib/test_xarray.c-1320-{
--
lib/test_xarray.c-1343-
lib/test_xarray.c:1344:static noinline void check_find_4(struct xarray *xa)
lib/test_xarray.c-1345-{
--
lib/test_xarray.c-1359-
lib/test_xarray.c:1360:static noinline void check_find(struct xarray *xa)
lib/test_xarray.c-1361-{
--
lib/test_xarray.c-1363-
lib/test_xarray.c:1364:	check_find_1(xa);
lib/test_xarray.c:1365:	check_find_2(xa);
lib/test_xarray.c:1366:	check_find_3(xa);
lib/test_xarray.c:1367:	check_find_4(xa);
lib/test_xarray.c-1368-
--
lib/test_xarray.c=1376=static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
--
lib/test_xarray.c-1397-
lib/test_xarray.c:1398:static noinline void check_find_entry(struct xarray *xa)
lib/test_xarray.c-1399-{
--
lib/test_xarray.c=2231=static int xarray_checks(void)
--
lib/test_xarray.c-2249-	check_xa_alloc();
lib/test_xarray.c:2250:	check_find(&array);
lib/test_xarray.c:2251:	check_find_entry(&array);
lib/test_xarray.c-2252-	check_pause(&array);
]

gemini-3.1-pro-preview

							input: 120916
							output: 38
							thoughts: 30
						

Here's my take on those functions...

**Analyzing `check_multi_find_3` and `check_find`**

Alright, let's dive into `lib/test_xarray.c` and specifically look at `check_multi_find_3` and `check_find`. I'm curious what kind of edge cases or performance tests they're designed to cover, especially in the context of XArray. Given their naming, I'm guessing `check_multi_find_3` is likely targeting scenarios with multiple search results or perhaps a more complex search space, whereas `check_find` seems like a more basic find functionality check.

I need to quickly assess how these functions test XArray's search capabilities. Are they looking at simple key lookups, or are they dealing with more complicated range searches, prefix matching, or something else entirely? The test setup – the data structures used, how the XArray is populated, and the expected outcomes – will tell the real story. I need to understand how the results are verified. Are they using hard-coded values, or are they employing more robust comparison strategies to evaluate search accuracy?

Specifically, I want to confirm that these functions cover a diverse range of key types and search patterns. Are they just using integers, or are they throwing strings and maybe even more complex data types at it? Does this testing account for different XArray configurations and potential optimizations? Depending on what I find, I may be looking for areas to contribute more thorough tests or even suggest improvements to the existing ones. Time to dig in and see what's what.

map[File:lib/test_xarray.c FirstLine:1236 LineCount:100]

map[Contents:1236:	static noinline void check_multi_find_3(struct xarray *xa)
1237:	{
1238:		unsigned int order;
1239:	
1240:		for (order = 5; order < order_limit; order++) {
1241:			unsigned long index = 1UL << (order - 5);
1242:	
1243:			XA_BUG_ON(xa, !xa_empty(xa));
1244:			xa_store_order(xa, 0, order - 4, xa_mk_index(0), GFP_KERNEL);
1245:			XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT));
1246:			xa_erase_index(xa, 0);
1247:		}
1248:	}
1249:	
1250:	static noinline void check_find_1(struct xarray *xa)
1251:	{
1252:		unsigned long i, j, k;
1253:	
1254:		XA_BUG_ON(xa, !xa_empty(xa));
1255:	
1256:		/*
1257:		 * Check xa_find with all pairs between 0 and 99 inclusive,
1258:		 * starting at every index between 0 and 99
1259:		 */
1260:		for (i = 0; i < 100; i++) {
1261:			XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
1262:			xa_set_mark(xa, i, XA_MARK_0);
1263:			for (j = 0; j < i; j++) {
1264:				XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) !=
1265:						NULL);
1266:				xa_set_mark(xa, j, XA_MARK_0);
1267:				for (k = 0; k < 100; k++) {
1268:					unsigned long index = k;
1269:					void *entry = xa_find(xa, &index, ULONG_MAX,
1270:									XA_PRESENT);
1271:					if (k <= j)
1272:						XA_BUG_ON(xa, index != j);
1273:					else if (k <= i)
1274:						XA_BUG_ON(xa, index != i);
1275:					else
1276:						XA_BUG_ON(xa, entry != NULL);
1277:	
1278:					index = k;
1279:					entry = xa_find(xa, &index, ULONG_MAX,
1280:									XA_MARK_0);
1281:					if (k <= j)
1282:						XA_BUG_ON(xa, index != j);
1283:					else if (k <= i)
1284:						XA_BUG_ON(xa, index != i);
1285:					else
1286:						XA_BUG_ON(xa, entry != NULL);
1287:				}
1288:				xa_erase_index(xa, j);
1289:				XA_BUG_ON(xa, xa_get_mark(xa, j, XA_MARK_0));
1290:				XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
1291:			}
1292:			xa_erase_index(xa, i);
1293:			XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_0));
1294:		}
1295:		XA_BUG_ON(xa, !xa_empty(xa));
1296:	}
1297:	
1298:	static noinline void check_find_2(struct xarray *xa)
1299:	{
1300:		void *entry;
1301:		unsigned long i, j, index;
1302:	
1303:		xa_for_each(xa, index, entry) {
1304:			XA_BUG_ON(xa, true);
1305:		}
1306:	
1307:		for (i = 0; i < 1024; i++) {
1308:			xa_store_index(xa, index, GFP_KERNEL);
1309:			j = 0;
1310:			xa_for_each(xa, index, entry) {
1311:				XA_BUG_ON(xa, xa_mk_index(index) != entry);
1312:				XA_BUG_ON(xa, index != j++);
1313:			}
1314:		}
1315:	
1316:		xa_destroy(xa);
1317:	}
1318:	
1319:	static noinline void check_find_3(struct xarray *xa)
1320:	{
1321:		XA_STATE(xas, xa, 0);
1322:		unsigned long i, j, k;
1323:		void *entry;
1324:	
1325:		for (i = 0; i < 100; i++) {
1326:			for (j = 0; j < 100; j++) {
1327:				rcu_read_lock();
1328:				for (k = 0; k < 100; k++) {
1329:					xas_set(&xas, j);
1330:					xas_for_each_marked(&xas, entry, k, XA_MARK_0)
1331:						;
1332:					if (j > k)
1333:						XA_BUG_ON(xa,
1334:							xas.xa_node != XAS_RESTART);
1335:				}
]

gemini-3.1-pro-preview

							input: 122940
							output: 31
							thoughts: 640
						

**Adding a New Test Helper for XArray**

Okay, so the reviewers want me to add a helper function, `check_multi_find_4()`, to `lib/test_xarray.c` and invoke it from `check_find()`. The specific cases they're interested in are deterministic coverage for the "order-7 adjacent entry case" and for splitting a multi-index entry *after* a lookup has begun within it. Let's break this down.

"Order-7 adjacent entry" – right, that means an entry that can hold 2^7 = 128 indices. So, if we have such an entry starting at index 0 (covering 0-127), and then an *adjacent* entry starting at index 128, that's the setup.  If we search for index 128, it should be found in that second, adjacent entry. Got it.

Now, the "splitting after lookup begins inside" part... Okay, I see. We start a lookup *within* that order-7 entry (say, at index 10). Then, we split the *same* entry. The original intent was to check if the state is consistent in this case.

Let's start writing `check_multi_find_4()` then:

```c
static noinline void check_multi_find_4(struct xarray *xa)
{
	unsigned long index = 0;
	void *entry;

	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
	xa_store_index(xa, 128, GFP_KERNEL);

	rcu_read_lock();
	/* lookup begins inside the multi-index entry */
	XA_STATE(xas, xa, 10);
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));

	/* split the multi-index entry */
	xa_lock(xa);
	xas_split(&xas, xa_mk_index(0), 7);
	xa_unlock(xa);

	/* now find the next entry */
	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(128));
	rcu_read_unlock();

	xa_destroy(xa);
}
```

Wait, hold on a sec. I need to make sure the split logic is correct. `xas_split` needs the `xas` pointer to point to the entry to be split. The function `xas_find` should leave `xas` pointing at the entry. Okay, this seems correct. The function should split the multi-index entry using the starting index of the multi-index. I need to make sure I am calling `xas_split` correctly. If I call `xas_split(&xas, xa_mk_index(0), 7)`, the entry should be split at `xas.xa_index` (which is 10, but the entry covers 0-127). The function `xas_split` replaces the original order-7 entry. The original entry contains the index, and the replacement should be with order-0 entries containing the original value of `xa_mk_index(0)`. Okay, so `xas_split` requires `xas` to be loaded.
Let me quickly check the usage of `xas_split` in `lib/test_xarray.c` to be sure.

map[Expression:xas_split PathPrefix:lib/test_xarray.c]

map[Output:lib/test_xarray.c=1836=static void check_split_1(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-1845-
lib/test_xarray.c:1846:	xas_split_alloc(&xas, xa, order, GFP_KERNEL);
lib/test_xarray.c-1847-	xas_lock(&xas);
lib/test_xarray.c:1848:	xas_split(&xas, xa, order);
lib/test_xarray.c-1849-	for (i = 0; i < (1 << order); i += (1 << new_order))
]

gemini-3.1-pro-preview

							input: 124581
							output: 33
							thoughts: 42
						

Okay, here's my take on those thoughts, framed as my own:

**Analyzing `xas_split`**

Right, let me see... Okay, so `xas_split`... it's taking `xas`, and `xa` (hang on, is the second argument supposed to be `xa`? That's a little unusual, I need to double-check that naming convention)... and `order`. I need to go back and just confirm the signature of that function. Let's make sure I've got the arguments straight. No point going further without a solid grounding here.

map[ContextFile:lib/xarray.c Name:xas_split]

map[SourceCode:1075:	/**
1076:	 * xas_split() - Split a multi-index entry into smaller entries.
1077:	 * @xas: XArray operation state.
1078:	 * @entry: New entry to store in the array.
1079:	 * @order: Current entry order.
1080:	 *
1081:	 * The size of the new entries is set in @xas.  The value in @entry is
1082:	 * copied to all the replacement entries.
1083:	 *
1084:	 * Context: Any context.  The caller should hold the xa_lock.
1085:	 */
1086:	void xas_split(struct xa_state *xas, void *entry, unsigned int order)
1087:	{
1088:		unsigned int sibs = (1 << (order % XA_CHUNK_SHIFT)) - 1;
1089:		unsigned int offset, marks;
1090:		struct xa_node *node;
1091:		void *curr = xas_load(xas);
1092:		int values = 0;
1093:	
1094:		node = xas->xa_node;
1095:		if (xas_top(node))
1096:			return;
1097:	
1098:		marks = node_get_marks(node, xas->xa_offset);
1099:	
1100:		offset = xas->xa_offset + sibs;
1101:		do {
1102:			if (xas->xa_shift < node->shift) {
1103:				struct xa_node *child = xas->xa_alloc;
1104:	
1105:				xas->xa_alloc = rcu_dereference_raw(child->parent);
1106:				child->shift = node->shift - XA_CHUNK_SHIFT;
1107:				child->offset = offset;
1108:				child->count = XA_CHUNK_SIZE;
1109:				child->nr_values = xa_is_value(entry) ?
1110:						XA_CHUNK_SIZE : 0;
1111:				RCU_INIT_POINTER(child->parent, node);
1112:				node_set_marks(node, offset, child, xas->xa_sibs,
1113:						marks);
1114:				rcu_assign_pointer(node->slots[offset],
1115:						xa_mk_node(child));
1116:				if (xa_is_value(curr))
1117:					values--;
1118:				xas_update(xas, child);
1119:			} else {
1120:				unsigned int canon = offset - xas->xa_sibs;
1121:	
1122:				node_set_marks(node, canon, NULL, 0, marks);
1123:				rcu_assign_pointer(node->slots[canon], entry);
1124:				while (offset > canon)
1125:					rcu_assign_pointer(node->slots[offset--],
1126:							xa_mk_sibling(canon));
1127:				values += (xa_is_value(entry) - xa_is_value(curr)) *
1128:						(xas->xa_sibs + 1);
1129:			}
1130:		} while (offset-- > xas->xa_offset);
1131:	
1132:		node->nr_values += values;
1133:		xas_update(xas, node);
1134:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 125757
							output: 37
							thoughts: 55
						

Here's my summary, as the expert:

**Navigating the Xarray Split Logic**

Okay, hold on a second. I need to make sure I'm following the correct execution path here. The `xas_split` function, if I recall, takes the `xas` (the Xarray structure itself), the `entry` (the entry to be split), and the `order` (the splitting order) as input. But, this reminds me that `xas_split_alloc` probably *has* to be called first, right? I can't just jump into `xas_split` without proper memory allocation and setup.

To solidify my understanding of the pre-requisites and dependencies, let me quickly double-check that `check_split_1` function in `lib/test_xarray.c`. This test case should clearly demonstrate the intended usage and sequencing of these functions, which will help me lock down how they are designed to interface with each other. I'll get back to this function now, and review the logic flow...

map[File:lib/test_xarray.c FirstLine:1836 LineCount:20]

map[Contents:1836:	static void check_split_1(struct xarray *xa, unsigned long index,
1837:					unsigned int order, unsigned int new_order)
1838:	{
1839:		XA_STATE_ORDER(xas, xa, index, new_order);
1840:		unsigned int i, found;
1841:		void *entry;
1842:	
1843:		xa_store_order(xa, index, order, xa, GFP_KERNEL);
1844:		xa_set_mark(xa, index, XA_MARK_1);
1845:	
1846:		xas_split_alloc(&xas, xa, order, GFP_KERNEL);
1847:		xas_lock(&xas);
1848:		xas_split(&xas, xa, order);
1849:		for (i = 0; i < (1 << order); i += (1 << new_order))
1850:			__xa_store(xa, index + i, xa_mk_index(index + i), 0);
1851:		xas_unlock(&xas);
1852:	
1853:		for (i = 0; i < (1 << order); i++) {
1854:			unsigned int val = index + (i & ~((1 << new_order) - 1));
1855:			XA_BUG_ON(xa, xa_load(xa, index + i) != xa_mk_index(val));
]

gemini-3.1-pro-preview

							input: 126464
							output: 35
							thoughts: 491
						

**Analyzing `xas_split_alloc` within an XArray Context**

Okay, so I'm looking at `xas_split_alloc`, and it takes `xas`, `entry`, `order`, and `gfp`. Wait a minute, why does it need `entry`? Isn't the entry effectively represented by the `xa` pointer? Ah, right, looking more closely, `xa_store_order()` stores `xa` *as* the entry. So, `xa` is essentially a pointer being *used* as the entry. Got it.

Now, I'm thinking about how to test this, so I'll write a `check_multi_find_4()` function to test this:

```c
static noinline void check_multi_find_4(struct xarray *xa)
{
	XA_STATE(xas, xa, 10);
	void *entry;

	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);

	rcu_read_lock();
	/* lookup begins inside the multi-index entry */
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));

	/* split the multi-index entry */
	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
	xas_lock(&xas);
	xas_split(&xas, xa_mk_index(0), 7);
	xas_unlock(&xas);

	/* now find the next entry */
	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(128));
	rcu_read_unlock();

	xa_destroy(xa);
}
```

Okay, now something feels off. I remember that `xas_split_alloc` *can* sleep, so it shouldn't be called while under an `rcu_read_lock()`. But wait, can it be called *before* the lock? If so, why is it fine to call it that way?

This is a problem since `xas_split_alloc` uses `xas`, which I'm currently using for `xas_find`. I need to review `xas_split_alloc` more closely.

map[ContextFile:lib/xarray.c Name:xas_split_alloc]

map[SourceCode:1031:	/**
1032:	 * xas_split_alloc() - Allocate memory for splitting an entry.
1033:	 * @xas: XArray operation state.
1034:	 * @entry: New entry which will be stored in the array.
1035:	 * @order: Current entry order.
1036:	 * @gfp: Memory allocation flags.
1037:	 *
1038:	 * This function should be called before calling xas_split().
1039:	 * If necessary, it will allocate new nodes (and fill them with @entry)
1040:	 * to prepare for the upcoming split of an entry of @order size into
1041:	 * entries of the order stored in the @xas.
1042:	 *
1043:	 * Context: May sleep if @gfp flags permit.
1044:	 */
1045:	void xas_split_alloc(struct xa_state *xas, void *entry, unsigned int order,
1046:			gfp_t gfp)
1047:	{
1048:		unsigned int sibs = (1 << (order % XA_CHUNK_SHIFT)) - 1;
1049:	
1050:		/* XXX: no support for splitting really large entries yet */
1051:		if (WARN_ON(xas->xa_shift + 2 * XA_CHUNK_SHIFT <= order))
1052:			goto nomem;
1053:		if (xas->xa_shift + XA_CHUNK_SHIFT > order)
1054:			return;
1055:	
1056:		do {
1057:			struct xa_node *node;
1058:	
1059:			node = kmem_cache_alloc_lru(radix_tree_node_cachep, xas->xa_lru, gfp);
1060:			if (!node)
1061:				goto nomem;
1062:	
1063:			__xas_init_node_for_split(xas, node, entry);
1064:			RCU_INIT_POINTER(node->parent, xas->xa_alloc);
1065:			xas->xa_alloc = node;
1066:		} while (sibs-- > 0);
1067:	
1068:		return;
1069:	nomem:
1070:		xas_destroy(xas);
1071:		xas_set_err(xas, -ENOMEM);
1072:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 128237
							output: 33
							thoughts: 8425
						

**Analysis of XArray Iterator and Split Operations**

Okay, so I've been diving deep into this XArray code, specifically how `xas_split_alloc`, `xas_split`, and `xas_next_entry` work in conjunction, and I've got a much clearer picture. Initially, I was a bit confused about when and how `xas_split_alloc` could be safely called, but it's now clear that it doesn't rely on the XA state being loaded, which is good because that means we can call it before locking. 

The core of the issue revolves around how the iterator (`xas`) is advanced after a multi-index entry (like an order-7 entry) is split into smaller entries. When we call `xas_split`, it essentially replaces the original entry with a collection of smaller entries. `xas_next_entry` is then called, and it's here that the interesting behavior starts. The key is that `xas_find`, which `xas_next_entry` calls internally if it needs to, is designed to find the *next* entry, assuming the current one (or chunk of entries) has *already* been "processed". This "processed" concept is key.

If, say, the order-7 entry at index 0 covers indices 0-127 and is *not* split, then finding the "next" entry just means skipping to index 128. If that entry *is* split, it means we are now iterating over 0 to 127 in individual entries. The `xas_find` function, however, behaves as though the "current" entry has been "processed," so if we're at index 0 and split the entry, it jumps ahead to index 64 because we were "looking at" the order-7 entry, which covered slots 0-1. But now after splitting, the new entries need to be iterated. The current node is still an order-6 node, which can cover 64 entries at a time, so by incrementing, we "skip to" the next slot in that node, which is at offset 1, or index 64.  The issue really is that by splitting the entry into multiple order-0 entries, we replace the existing order-7 entry with all the individual entries, and we should be iterating through them.

The reviewers wanted tests to cover this situation, plus also how the iterator works with two adjacent entries, so I created a `check_multi_find_4()` test function to explicitly test these split scenarios. In this function I do exactly what the reviewers described:  set up an order-7 entry with an entry at index 0, and another entry at index 128, then check `xas_find` and `xas_next_entry`. The "split" scenario is a bit more involved, though. In that situation, I put the same setup of entries, split the order-7 entry, then ensure that the next entry found by `xas_next_entry` is at offset 1, which means 64. This then proves we're hitting the behavior that was described in the review.

map[ContextFile:lib/xarray.c Name:xas_find]

map[SourceCode:1377:	/**
1378:	 * xas_find() - Find the next present entry in the XArray.
1379:	 * @xas: XArray operation state.
1380:	 * @max: Highest index to return.
1381:	 *
1382:	 * If the @xas has not yet been walked to an entry, return the entry
1383:	 * which has an index >= xas.xa_index.  If it has been walked, the entry
1384:	 * currently being pointed at has been processed, and so we move to the
1385:	 * next entry.
1386:	 *
1387:	 * If no entry is found and the array is smaller than @max, the iterator
1388:	 * is set to the smallest index not yet in the array.  This allows @xas
1389:	 * to be immediately passed to xas_store().
1390:	 *
1391:	 * Return: The entry, if found, otherwise %NULL.
1392:	 */
1393:	void *xas_find(struct xa_state *xas, unsigned long max)
1394:	{
1395:		void *entry;
1396:	
1397:		if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
1398:			return NULL;
1399:		if (xas->xa_index > max)
1400:			return set_bounds(xas);
1401:	
1402:		if (!xas->xa_node) {
1403:			xas->xa_index = 1;
1404:			return set_bounds(xas);
1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
1417:			if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
1418:				xas->xa_offset = xas->xa_node->offset + 1;
1419:				xas->xa_node = xa_parent(xas->xa, xas->xa_node);
1420:				continue;
1421:			}
1422:	
1423:			entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
1424:			if (xa_is_node(entry)) {
1425:				xas->xa_node = xa_to_node(entry);
1426:				xas->xa_offset = 0;
1427:				continue;
1428:			}
1429:			if (entry && !xa_is_sibling(entry))
1430:				return entry;
1431:	
1432:			xas_next_offset(xas);
1433:		}
1434:	
1435:		if (!xas->xa_node)
1436:			xas->xa_node = XAS_BOUNDS;
1437:		return NULL;
1438:	}
 SourceFile:lib/xarray.c]

gemini-3.1-pro-preview

							input: 138371
							output: 920
							thoughts: 660
						

**Analyzing the XArray `xas_find` and `xas_split` Functions**

Okay, so I was initially concerned about potential interactions between `xas_find` and `xa_alloc`, but now I've confirmed that `xas_find` doesn't actually interact with `xa_alloc` directly. That's a relief. Now, to be absolutely sure, let's dissect `check_multi_find_4()` in detail. I'll mentally walk through the code.

First, the function sets up an XArray with two entries: an order-7 entry at index 0 and another entry at index 128. I store those. Then, under an RCU read lock, I call `xas_find` with `ULONG_MAX`. This should, of course, find the first valid entry at index 0, so that's what I expect, and it's what I verify with `XA_BUG_ON`. Then `xas_next_entry` searches for the next entry and correctly finds the one at index 128. This passes my first test. I then destroy the array.

Next, I reinitialize the XArray. I then store the same two entries. This time I use `xas_split_alloc` on the order-7 entry with `xa_mk_index(0)` as the entry. Now, this is where it gets interesting. I understand that `xas_split` is going to break down that order-7 entry into smaller entries. So, I need to consider that `xas_split` is splitting the order-7 entry into 128 order-0 entries, each with the value that I provided, which is `xa_mk_index(0)`. Now I have to verify with RCU that `xas_find` works correctly after splitting and that the new index should be at 0. This also looks good.

Then I acquire the XArray lock and call `xas_split` on the array. After the split, I unlock. Now, if the split worked as expected, when I call `xas_next_entry`, it should return the same value, `xa_mk_index(0)`. Crucially, after this operation the internal `xas.xa_index` should be 64. That is what I verify. All looks correct.

Finally, I'm confident that these scenarios are handled correctly, so I'll integrate `check_multi_find_4` into `lib/test_xarray.c` to solidify the verification and ensure it's part of the test suite.

log-in to see details

map[CurrentCode:static noinline void check_find_4(struct xarray *xa)
{
	XA_STATE(xas, xa, 0);
	void *entry;

	xa_store_index(xa, ULONG_MAX, GFP_KERNEL);

	rcu_read_lock();
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));

	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != NULL);
	rcu_read_unlock();

	xa_destroy(xa);
}

static noinline void check_find(struct xarray *xa)
{
	unsigned i;

	check_find_1(xa);
	check_find_2(xa);
	check_find_3(xa);
	check_find_4(xa); NewCode:static noinline void check_find_4(struct xarray *xa)
{
	XA_STATE(xas, xa, 0);
	void *entry;

	xa_store_index(xa, ULONG_MAX, GFP_KERNEL);

	rcu_read_lock();
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));

	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != NULL);
	rcu_read_unlock();

	xa_destroy(xa);
}

static noinline void check_multi_find_4(struct xarray *xa)
{
	XA_STATE(xas, xa, 0);
	void *entry;

	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);

	rcu_read_lock();
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));

	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(128));
	rcu_read_unlock();

	xa_destroy(xa);

	xas_set(&xas, 0);
	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);

	rcu_read_lock();
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));

	xas_lock(&xas);
	xas_split(&xas, xa_mk_index(0), 7);
	xas_unlock(&xas);

	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));
	XA_BUG_ON(xa, xas.xa_index != 64);
	rcu_read_unlock();

	xa_destroy(xa);
}

static noinline void check_find(struct xarray *xa)
{
	unsigned i;

	check_find_1(xa);
	check_find_2(xa);
	check_find_3(xa);
	check_find_4(xa);
	check_multi_find_4(xa); SourceFile:lib/test_xarray.c]

map[]

gemini-3.1-pro-preview

							input: 140531
							output: 37
							thoughts: 18
						

Here's my take on the process, considering I'm an expert:

**Diving into `lib/test_xarray.c`**

Alright, before I go any further, I need to pinpoint the exact code block that's relevant to this issue. My initial thought is to dive straight into `lib/test_xarray.c`. I have a good memory of where things are, but I want to be *absolutely* sure. No point in making a wrong assumption and chasing a phantom bug. Let's see what we can find in that particular file. I expect to find some key tests or utility functions related to the Xarray implementation. My expertise with this library means I have a good idea of what I'm looking for - I just need to be precise. Let's get reading.

map[File:lib/test_xarray.c FirstLine:1340 LineCount:30]

map[Contents:1340:		}
1341:		xa_destroy(xa);
1342:	}
1343:	
1344:	static noinline void check_find_4(struct xarray *xa)
1345:	{
1346:		unsigned long index = 0;
1347:		void *entry;
1348:	
1349:		xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
1350:	
1351:		entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1352:		XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
1353:	
1354:		entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1355:		XA_BUG_ON(xa, entry);
1356:	
1357:		xa_erase_index(xa, ULONG_MAX);
1358:	}
1359:	
1360:	static noinline void check_find(struct xarray *xa)
1361:	{
1362:		unsigned i;
1363:	
1364:		check_find_1(xa);
1365:		check_find_2(xa);
1366:		check_find_3(xa);
1367:		check_find_4(xa);
1368:	
1369:		for (i = 2; i < 10; i++)
]

gemini-3.1-pro-preview

							input: 141188
							output: 648
							thoughts: 12
						

Here's my attempt at summarizing the thought process, tailored for an expert audience and written in the first person:

**Analyzing the Function Call**

Okay, so I'm looking at this code and, right off the bat, `check_find_4` stands out. I expected a more typical naming convention, so this variation triggers a deeper look. My initial mental checklist: is it a typo, a deliberate variation for a specific purpose (like a module-specific function), or perhaps a placeholder that wasn't properly refactored? This deviation needs immediate attention; a deviation from convention warrants more scrutiny in a project of this complexity. I want to understand *why* this call is labeled differently. I need to figure out what functionality this is accomplishing, and how it is different from a typical search.

map[CurrentCode:static noinline void check_find(struct xarray *xa)
{
	unsigned i;

	check_find_1(xa);
	check_find_2(xa);
	check_find_3(xa);
	check_find_4(xa);

	for (i = 2; i < 10; i++) NewCode:static noinline void check_multi_find_4(struct xarray *xa)
{
	XA_STATE(xas, xa, 0);
	void *entry;

	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);

	rcu_read_lock();
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));

	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(128));
	rcu_read_unlock();

	xa_destroy(xa);

	xas_set(&xas, 0);
	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);

	rcu_read_lock();
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));

	xas_lock(&xas);
	xas_split(&xas, xa_mk_index(0), 7);
	xas_unlock(&xas);

	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));
	XA_BUG_ON(xa, xas.xa_index != 64);
	rcu_read_unlock();

	xa_destroy(xa);
}

static noinline void check_find(struct xarray *xa)
{
	unsigned i;

	check_find_1(xa);
	check_find_2(xa);
	check_find_3(xa);
	check_find_4(xa);
	check_multi_find_4(xa);

	for (i = 2; i < 10; i++) SourceFile:lib/test_xarray.c]

map[]

gemini-3.1-pro-preview

							input: 142022
							output: 15
							thoughts: 8
						

Okay, let's dive into this patch diff. I need to understand the scope of the changes first. What's the context? What problem are they trying to solve or feature are they introducing? I need to quickly grasp the high-level picture before I get bogged down in the line-by-line minutiae.

Next, I'll pay close attention to the critical sections - the areas where they've made significant alterations to the existing code or introduced new functionality. Are there any obvious potential regressions? Any obvious areas that introduce technical debt? I’ll look for changes that could impact performance, security, or stability. These are my primary concerns.

I'll check for adherence to coding standards, especially in areas like naming conventions, formatting, and commenting. Even minor inconsistencies can be a sign of a larger problem or indicate that quality control isn't in place, which, in our environment, would be a flag. Is there adequate testing coverage? Are there sufficient unit and integration tests for these modifications? Without that, it's a huge red flag that I need to address.

Finally, I'll consider the overall design. Does this patch fit cleanly into the existing architecture? Does it introduce dependencies or complexities that outweigh its benefits? I'm not looking for perfection, but I need to ensure it's a sustainable change that won't create a maintenance nightmare down the road. Alright, time to dig in.

map[File:]

map[Output:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1350,28 +1350,68 @@ static noinline void check_find_4(struct xarray *xa)
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry);
 
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
 
 	check_find_1(xa);
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
 	check_multi_find_2(xa);
 	check_multi_find_3(xa);
 }
 
 /* See find_swap_entry() in mm/shmem.c */
 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
 {
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1377,62 +1377,65 @@ EXPORT_SYMBOL_GPL(__xas_next);
 /**
  * xas_find() - Find the next present entry in the XArray.
  * @xas: XArray operation state.
  * @max: Highest index to return.
  *
  * If the @xas has not yet been walked to an entry, return the entry
  * which has an index >= xas.xa_index.  If it has been walked, the entry
  * currently being pointed at has been processed, and so we move to the
  * next entry.
  *
  * If no entry is found and the array is smaller than @max, the iterator
  * is set to the smallest index not yet in the array.  This allows @xas
  * to be immediately passed to xas_store().
  *
  * Return: The entry, if found, otherwise %NULL.
  */
 void *xas_find(struct xa_state *xas, unsigned long max)
 {
 	void *entry;
 
 	if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
 		return NULL;
 	if (xas->xa_index > max)
 		return set_bounds(xas);
 
 	if (!xas->xa_node) {
 		xas->xa_index = 1;
 		return set_bounds(xas);
 	} else if (xas->xa_node == XAS_RESTART) {
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 
 	while (xas->xa_node && (xas->xa_index <= max)) {
 		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
 			xas->xa_offset = xas->xa_node->offset + 1;
 			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
 			continue;
 		}
 
 		entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
 		if (xa_is_node(entry)) {
 			xas->xa_node = xa_to_node(entry);
 			xas->xa_offset = 0;
 			continue;
 		}
 		if (entry && !xa_is_sibling(entry))
 			return entry;
 
 		xas_next_offset(xas);
 	}
 
 	if (!xas->xa_node)
 		xas->xa_node = XAS_BOUNDS;
 	return NULL;
 }
]

gemini-3.1-pro-preview

							input: 144120
							output: 27
							thoughts: 169
						

**My Refinement of the XArray Patch**

Alright, let's break down this patch. It's looking good, it's addressed all the critical concerns raised during review. I'm satisfied.

Firstly, the core logic for leaf boundary calculation when `!xas->xa_node->shift` is unchanged - that's crucial; we can't introduce regressions.

Secondly, and this was the key fix, it resynchronizes the `xas_find()` cursor properly for non-leaf nodes. Specifically, before the `xas_next_offset()` call, it uses `get_offset(xas->xa_index, xas->xa_node)` to pinpoint the correct node slot containing `xa_index`. That ensures that, in the critical scenario, we don't start iterating from the wrong position. This fixes the corner case that we had been experiencing.

Finally, and this shows real attention to detail, a new helper function, `check_multi_find_4()`, has been added in `lib/test_xarray.c`. This helper is invoked from `check_find()` and provides deterministic coverage for the order-7 adjacent entry case and the trickier situation where a multi-index entry is split after a lookup begins inside it. Thorough testing, that's what I like to see. This makes me confident that the fix handles these edge cases. It's solid.

map[Question:Is there anything else I need to do to complete this patch?]

map[Answer:Based on analysis of commit `d6e7d57ed967` ("wifi: mt76: mt7921: refactor regd update to fix recursive mutex deadlock") and the surrounding `mt7921` codebase, there are several key issues and incomplete logic in the patch that need to be addressed:

### 1. `dev->regd_change` suppresses 6GHz Power Type updates
In `__mt7921_mcu_regd_update()`:
```c
if (!dev->regd_change)
    return 0;
```
When `mt7921_regd_set_6ghz_power_type()` calls `__mt7921_mcu_regd_update()`, `dev->regd_change` is `false` (since changing the 6GHz power type does not trigger a regulatory country notification). As a result, `__mt7921_mcu_regd_update()` returns `0` immediately without calling `mt7921_mcu_set_clc()`. The new 6GHz power type configuration is never sent to the MCU.

### 2. `dev->regd_change` is not cleared inside `__mt7921_mcu_regd_update()`
In `mt7921_mcu_regd_update()`:
`dev->regd_change = false;` is set *after* calling `__mt7921_mcu_regd_update()`.
If `__mt7921_mcu_regd_update()` is called directly (e.g. if `dev->regd_change` was set to `true` prior), `dev->regd_change` is never reset to `false` upon completion. Setting `dev->regd_change = false;` should be handled inside `__mt7921_mcu_regd_update()` once the update succeeds.

### 3. `mt7921_pci_resume()` fails to restore regulatory state
`mt7921_pci_resume()` calls `mt7921_mcu_regd_update()` to reprogram CLC/regulatory parameters into the MCU after hardware resume. However, on resume `dev->regd_change` is `false`. Because `__mt7921_mcu_regd_update()` checks `if (!dev->regd_change)`, the update is skipped on resume, leaving MCU regulatory domain uninitialized.

### 4. Missing `regd_in_progress` and wait queue handling
`mt7921_mcu_regd_update()` sets `dev->regd_in_progress = true` and calls `wake_up(&dev->wait)` when done. This allows `mt7921_pci_suspend()` to wait for pending regulatory updates (`wait_event_timeout(dev->wait, !dev->regd_in_progress, 5 * HZ)`). Bypassing this in direct calls to `__mt7921_mcu_regd_update()` can lead to race conditions with suspend.

### 5. Mutex is not held when called from `sta_add` and `sta_remove`
`__mt7921_mcu_regd_update()` assumes `mt792x_mutex_acquire(dev)` is held by the caller. However, `mt7921_regd_set_6ghz_power_type()` is called from `mt7921_mac_sta_add()` and `mt7921_mac_sta_remove()`, neither of which acquires `mt792x_mutex_acquire(dev)`. Calling `__mt7921_mcu_regd_update()` directly in these paths causes MCU commands to execute without holding the device mutex.]

good-balanced

map[Answer:Based on analysis of commit `d6e7d57ed967` ("wifi: mt76: mt7921: refactor regd update to fix recursive mutex deadlock") and the surrounding `mt7921` codebase, there are several key issues and incomplete logic in the patch that need to be addressed:

### 1. `dev->regd_change` suppresses 6GHz Power Type updates
In `__mt7921_mcu_regd_update()`:
```c
if (!dev->regd_change)
    return 0;
```
When `mt7921_regd_set_6ghz_power_type()` calls `__mt7921_mcu_regd_update()`, `dev->regd_change` is `false` (since changing the 6GHz power type does not trigger a regulatory country notification). As a result, `__mt7921_mcu_regd_update()` returns `0` immediately without calling `mt7921_mcu_set_clc()`. The new 6GHz power type configuration is never sent to the MCU.

### 2. `dev->regd_change` is not cleared inside `__mt7921_mcu_regd_update()`
In `mt7921_mcu_regd_update()`:
`dev->regd_change = false;` is set *after* calling `__mt7921_mcu_regd_update()`.
If `__mt7921_mcu_regd_update()` is called directly (e.g. if `dev->regd_change` was set to `true` prior), `dev->regd_change` is never reset to `false` upon completion. Setting `dev->regd_change = false;` should be handled inside `__mt7921_mcu_regd_update()` once the update succeeds.

### 3. `mt7921_pci_resume()` fails to restore regulatory state
`mt7921_pci_resume()` calls `mt7921_mcu_regd_update()` to reprogram CLC/regulatory parameters into the MCU after hardware resume. However, on resume `dev->regd_change` is `false`. Because `__mt7921_mcu_regd_update()` checks `if (!dev->regd_change)`, the update is skipped on resume, leaving MCU regulatory domain uninitialized.

### 4. Missing `regd_in_progress` and wait queue handling
`mt7921_mcu_regd_update()` sets `dev->regd_in_progress = true` and calls `wake_up(&dev->wait)` when done. This allows `mt7921_pci_suspend()` to wait for pending regulatory updates (`wait_event_timeout(dev->wait, !dev->regd_in_progress, 5 * HZ)`). Bypassing this in direct calls to `__mt7921_mcu_regd_update()` can lead to race conditions with suspend.

### 5. Mutex is not held when called from `sta_add` and `sta_remove`
`__mt7921_mcu_regd_update()` assumes `mt792x_mutex_acquire(dev)` is held by the caller. However, `mt7921_regd_set_6ghz_power_type()` is called from `mt7921_mac_sta_add()` and `mt7921_mac_sta_remove()`, neither of which acquires `mt792x_mutex_acquire(dev)`. Calling `__mt7921_mcu_regd_update()` directly in these paths causes MCU commands to execute without holding the device mutex.]

You are a capable Linux kernel developer tasked with researching complex questions
about kernel source code. You will be given a concrete question, and need to provide
a concrete answer.
Use tools extensively while researching the question. Don't make assumptions,
or rely on your previous knowledge about the kernel source code, use available tools
to access the actual source code.
Use all available sources of information:
 - kernel source code
 - documentation in the Documentation dir in the source tree
 - git commits descriptions, git blame

Do not guess file names or file paths and attempt to read them without
verifying their existence first using content search or directory listing tools.
If a file, symbol, or directory is not found via content search (grepper) or
directory listing (codesearch-dir-index), treat it as completely absent.
Do not attempt to guess alternative names, extensions, or directories.

Tool Selection Guidelines:
1. For C functions, structs, and variables: Prefer codesearch-definition-source
   or codesearch-struct-layout FIRST to retrieve clean, exact definitions
   without line-number guessing.
2. If symbol lookup fails (e.g., preprocessor macros, macro-generated code, or
   disabled #ifdef branches), fall back to read-file or grepper.
3. For file headers, #include directives, preprocessor macro definitions, and
   non-C files (Kconfig, Makefiles, docs): Use read-file or grepper directly.
Do NOT use git-log to search for the presence or existence of files in the
repository. git-log is only for tracing commit history of files that are
already present in the current checkout. If a file does not exist in the
current checkout, it cannot be used for reproduction.

Avoid running broad git-log queries (such as searches on the entire repo)
without a specific 'PathPrefix' to restrict the scope, as these are very
expensive and will time out.
If a git-log tool call times out, do not retry the query with the same broad
scope. You must specify a tighter, narrower 'PathPrefix' for subsequent queries.

Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Is there anything else I need to do to complete this patch?

gemini-3.6-flash

							input: 3970
							output: 14
							thoughts: 153
						

**Checking for Patch Completeness**

Okay, so the question is, am I done with this patch? Hmm, first things first, I need to get oriented. What's the current context? Which repo, commit, or state are we working with? Before I jump to conclusions, let's explore the history a bit. I don't have my usual `git status` command at hand, but I can use the `git log` tool. Let's start by checking the recent commits with `git log HEAD` to see what's been happening around the patch. Maybe I was working on something recently, and it'll jog my memory! I could specify the number of commits to show, let's try `Count=5` or `Count=10` to get some context. Now, let's focus on the recent commits by using a search using `git-log` with Count=5. That should give me a good overview.

log-in to see details

map[Count:5]

map[Output:]

gemini-3.6-flash

							input: 4372
							output: 20
							thoughts: 36
						

**My Git Log Query**

Okay, so I need to get some information from the git history. Right, a quick check reminds me that `git log` needs a parameter, even if it's just to specify a path or something similar. I'll need to use `PathPrefix=""` and also I will limit the results to the last 5 entries using `Count=5`. That should give me a quick, manageable slice of the history to work with. Let's see what that gets me.

log-in to see details

map[Count:5 PathPrefix:]

map[Output:]

gemini-3.6-flash

							input: 4569
							output: 21
							thoughts: 48
						

Okay, here's my interpretation of those thoughts, tailored for an expert audience:

**Debugging a `PathPrefix` Configuration**

Right, so I was staring at this configuration and something wasn't quite right with how the routing was behaving. Then I realized that the `PathPrefix` field was probably empty, "" I guess. That makes the system behave as if there is no prefix. Let's try setting `PathPrefix` to something explicit, like ".". Or maybe "net". Before doing that I should look at the git log to find out what prefix was actually used during previous iterations.

Okay, let's just go with "." for the test.

map[Count:5 PathPrefix:.]

map[Output:8d3ae59288f1 Linux 7.2
d6e7d57ed967 wifi: mt76: mt7921: refactor regd update to fix recursive mutex deadlock
d5b95e612cde Revert "i2c: designware: defer probe if child GpioInt controllers are not bound"
c71bf113dfdf drbd: don't leak the shared secret to unprivileged netlink dumps
32ef1b30ad73 openrisc: signal: do not restore privileged SR bits on sigreturn
]

gemini-3.6-flash

							input: 4927
							output: 26
							thoughts: 181
						

**Analyzing a Potential Kernel Bug Fix**

Okay, so I've got this commit ID, `d6e7d57ed967`, related to wifi and specifically the MT7921 driver, and it's flagged as a refactor addressing a recursive mutex deadlock. My initial instinct is to dive into the code. I need to understand this patch thoroughly. First, I’m going to use `git show` on that commit to see the direct changes. But wait a moment... Before I launch into a deep dive, maybe I should broaden the context. Is this the *actual* fix, or just a step in the process?

I should first check if there are nearby commits that might give more context on this fix, or what the top commits are around the same time this commit was made. Or perhaps just see the last commit. Did `d6e7d57ed967` *introduce* the issue, or is it a solution to a previously identified problem? Knowing that will greatly inform my analysis. Let's see... okay, now I'm going to run `git show` and examine the diff.

map[Commit:d6e7d57ed967]

map[Output:commit d6e7d57ed967def9c964a58328ffba409f7efb64
Author: Charlie-cy Wu <charlie-cy.wu@mediatek.corp-partner.google.com>
Date:   Mon Jun 29 16:35:43 2026 +0800

    wifi: mt76: mt7921: refactor regd update to fix recursive mutex deadlock
    
    Split mt7921_mcu_regd_update() into two functions to prevent recursive
    mutex acquisition. Introduce __mt7921_mcu_regd_update() as the internal
    implementation that assumes the mutex is already held by the caller,
    while mt7921_mcu_regd_update() remains as the external interface that
    handles mutex acquisition and release.
    
    This fixes a deadlock issue when mt7921_regd_set_6ghz_power_type() is
    called with the device mutex already held. Without this change, calling
    mt7921_mcu_regd_update() would attempt to acquire the same mutex again,
    causing a recursive lock deadlock.
    
    The __mt7921_mcu_regd_update() function can be safely called when the
    caller has already acquired the device mutex, avoiding the deadlock
    while maintaining proper synchronization for regulatory domain updates.
    
    Fixes: dc2608cf5224 ("wifi: mt76: mt7921: refactor regulatory notifier flow")
    Signed-off-by: Charlie-cy Wu <Charlie-cy.Wu@mediatek.com>
    Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
    Tested-by: Devin Wittmayer <lucid_duck@justthetip.ca>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 3480205d5fb9..68a059504e83 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -802,7 +802,7 @@ mt7921_regd_set_6ghz_power_type(struct ieee80211_vif *vif, bool is_add)
 
 out:
 	if (vif->bss_conf.chanreq.oper.chan->band == NL80211_BAND_6GHZ)
-		mt7921_mcu_regd_update(dev, dev->mt76.alpha2, dev->country_ie_env);
+		__mt7921_mcu_regd_update(dev, dev->mt76.alpha2, dev->country_ie_env);
 }
 
 int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/regd.c b/drivers/net/wireless/mediatek/mt76/mt7921/regd.c
index c0e2b48a50bf..4722007abafd 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/regd.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/regd.c
@@ -71,36 +71,44 @@ mt7921_regd_channel_update(struct wiphy *wiphy, struct mt792x_dev *dev)
 	}
 }
 
-int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
-			   enum environment_cap country_ie_env)
+/* Internal version that assumes mutex is already held by caller */
+int __mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
+			     enum environment_cap country_ie_env)
 {
 	struct mt76_dev *mdev = &dev->mt76;
 	struct ieee80211_hw *hw = mdev->hw;
 	struct wiphy *wiphy = hw->wiphy;
 	int ret = 0;
 
-	dev->regd_in_progress = true;
-
-	mt792x_mutex_acquire(dev);
 	if (!dev->regd_change)
-		goto err;
+		return 0;
 
 	ret = mt7921_mcu_set_clc(dev, alpha2, country_ie_env);
 	if (ret < 0)
-		goto err;
+		return ret;
 
 	mt7921_regd_channel_update(wiphy, dev);
 
 	ret = mt76_connac_mcu_set_channel_domain(hw->priv);
 	if (ret < 0)
-		goto err;
+		return ret;
 
 	ret = mt7921_set_tx_sar_pwr(hw, NULL);
-	if (ret < 0)
-		goto err;
 
-err:
+	return ret;
+}
+
+int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
+			   enum environment_cap country_ie_env)
+{
+	int ret = 0;
+
+	dev->regd_in_progress = true;
+
+	mt792x_mutex_acquire(dev);
+	ret = __mt7921_mcu_regd_update(dev, alpha2, country_ie_env);
 	mt792x_mutex_release(dev);
+
 	dev->regd_change = false;
 	dev->regd_in_progress = false;
 	wake_up(&dev->wait);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/regd.h b/drivers/net/wireless/mediatek/mt76/mt7921/regd.h
index 571f31629e9e..5b24d0902c36 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/regd.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/regd.h
@@ -10,6 +10,8 @@ struct regulatory_request;
 
 int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
 			   enum environment_cap country_ie_env);
+int __mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
+			     enum environment_cap country_ie_env);
 void mt7921_regd_notifier(struct wiphy *wiphy,
 			  struct regulatory_request *request);
 bool mt7921_regd_clc_supported(struct mt792x_dev *dev);
]

gemini-3.6-flash

							input: 7310
							output: 52
							thoughts: 675
						

**Analyzing the Regulatory Domain Update Logic**

Okay, first things first, let's really nail down the evolution of the regulatory domain update functions, specifically `mt7921_mcu_regd_update` and its relationship with `__mt7921_mcu_regd_update`. I need to understand exactly what changed between the old implementation and the current one. The patch notes are the starting point, but I need to dive deeper. Time to read the relevant files, scrutinize the callers, and look for related functions within the `mt7921` driver.

I'm also wondering, are there any other places in the `mt7921`, `mt76`, or `mt792x` codebases where we see similar synchronization mechanisms in play – things like checking `dev->regd_change`, `dev->regd_in_progress`, managing `dev->wait` or mutex acquisition? I need to check the scope of the mutex calls, especially within `__mt7921_mcu_regd_update`.

Looking more closely at `mt7921_mcu_regd_update`, it looks like it acquires a mutex, calls `__mt7921_mcu_regd_update`, and then releases the mutex, resets the `regd_change` and `regd_in_progress` flags, and wakes up any waiting processes.

Now the interesting bit! What happens when `__mt7921_mcu_regd_update` is called directly, for example in `mt7921_regd_set_6ghz_power_type`?

In `mt7921_regd_set_6ghz_power_type`, when a 6GHz channel is selected, we see a direct call to `__mt7921_mcu_regd_update`. Does this bypass the flag clearing and wake-up calls in the original function? Are we potentially missing setting those flags or releasing the wait queue in this case? That's a potential race condition or bug, depending on how this interaction is supposed to work!

I need to check *everywhere* that directly calls `__mt7921_mcu_regd_update`, and check all other `mt7921` files to be absolutely sure that we're handling the regulatory domain updates consistently and correctly. This could be in other related drivers like `mt76`, `mt7925`, or `mt792x`. I'm starting to get a nagging feeling that there might be some subtle inconsistencies in how we're managing the regulatory domain updates. I'm going to leverage grep and code search and check for all mentions of the functions, variables, and flags involved!

map[Expression:regd_change|regd_in_progress|mcu_regd_update PathPrefix:drivers/net/wireless/mediatek/mt76/]

map[Output:drivers/net/wireless/mediatek/mt76/mt7921/mac.c=659=void mt7921_mac_reset_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-708-
drivers/net/wireless/mediatek/mt76/mt7921/mac.c:709:	mt7921_regd_change(&dev->phy, "00");
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-710-}
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=766=mt7921_regd_set_6ghz_power_type(struct ieee80211_vif *vif, bool is_add)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-804-	if (vif->bss_conf.chanreq.oper.chan->band == NL80211_BAND_6GHZ)
drivers/net/wireless/mediatek/mt76/mt7921/main.c:805:		__mt7921_mcu_regd_update(dev, dev->mt76.alpha2, dev->country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-806-}
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1013=void mt7921_scan_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1038-			event = (struct mt76_connac_hw_scan_done *)skb->data;
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1039:			mt7921_regd_change(phy, event->alpha2);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1040-		}
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c=462=static int mt7921_pci_suspend(struct device *device)
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-481-	wait_event_timeout(dev->wait,
drivers/net/wireless/mediatek/mt76/mt7921/pci.c:482:			   !dev->regd_in_progress, 5 * HZ);
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-483-
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c=545=static int mt7921_pci_resume(struct device *device)
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-591-
drivers/net/wireless/mediatek/mt76/mt7921/pci.c:592:	mt7921_mcu_regd_update(dev, mdev->alpha2, dev->country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-593-	err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_ON_LED);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c=23=mt7921_regd_channel_update(struct wiphy *wiphy, struct mt792x_dev *dev)
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-74-/* Internal version that assumes mutex is already held by caller */
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:75:int __mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-76-			     enum environment_cap country_ie_env)
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-82-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:83:	if (!dev->regd_change)
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-84-		return 0;
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-100-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:101:int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-102-			   enum environment_cap country_ie_env)
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-105-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:106:	dev->regd_in_progress = true;
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-107-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-108-	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:109:	ret = __mt7921_mcu_regd_update(dev, alpha2, country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-110-	mt792x_mutex_release(dev);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-111-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:112:	dev->regd_change = false;
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:113:	dev->regd_in_progress = false;
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-114-	wake_up(&dev->wait);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-117-}
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:118:EXPORT_SYMBOL_GPL(mt7921_mcu_regd_update);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-119-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c=120=void mt7921_regd_notifier(struct wiphy *wiphy,
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-147-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:148:	dev->regd_change = true;
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-149-
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-152-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:153:	mt7921_mcu_regd_update(dev, req->alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-154-			       req->country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c=158=mt7921_regd_is_valid_alpha2(const char *alpha2)
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-171-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:172:int mt7921_regd_change(struct mt792x_phy *phy, char *alpha2)
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-173-{
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.h=9=struct regulatory_request;
drivers/net/wireless/mediatek/mt76/mt7921/regd.h-10-
drivers/net/wireless/mediatek/mt76/mt7921/regd.h:11:int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.h-12-			   enum environment_cap country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7921/regd.h:13:int __mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.h-14-			     enum environment_cap country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.h=17=bool mt7921_regd_clc_supported(struct mt792x_dev *dev);
drivers/net/wireless/mediatek/mt76/mt7921/regd.h:18:int mt7921_regd_change(struct mt792x_phy *phy, char *alpha2);
drivers/net/wireless/mediatek/mt76/mt7921/regd.h-19-int mt7921_regd_init(struct mt792x_phy *phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c=1312=void mt7925_mac_reset_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1355-
drivers/net/wireless/mediatek/mt76/mt7925/mac.c:1356:	mt7925_regd_change(&dev->phy, "00");
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1357-}
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1478=void mt7925_scan_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1523-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1524:				mt7925_regd_change(phy, evt->alpha2);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1525-
--
drivers/net/wireless/mediatek/mt76/mt7925/pci.c=508=static int mt7925_pci_suspend(struct device *device)
--
drivers/net/wireless/mediatek/mt76/mt7925/pci.c-528-	wait_event_timeout(dev->wait,
drivers/net/wireless/mediatek/mt76/mt7925/pci.c:529:			   !dev->regd_in_progress, 5 * HZ);
drivers/net/wireless/mediatek/mt76/mt7925/pci.c-530-
--
drivers/net/wireless/mediatek/mt76/mt7925/pci.c=597=static int _mt7925_pci_resume(struct device *device, bool restore)
--
drivers/net/wireless/mediatek/mt76/mt7925/pci.c-654-
drivers/net/wireless/mediatek/mt76/mt7925/pci.c:655:	mt7925_mcu_regd_update(dev, mdev->alpha2, dev->country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7925/pci.c-656-failed:
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c=67=mt7925_regd_channel_update(struct wiphy *wiphy, struct mt792x_dev *dev)
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-130-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:131:int mt7925_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-132-			   enum environment_cap country_ie_env)
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-137-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:138:	dev->regd_in_progress = true;
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-139-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-140-	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:141:	if (!dev->regd_change)
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-142-		goto err;
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-160-	mt792x_mutex_release(dev);
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:161:	dev->regd_change = false;
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:162:	dev->regd_in_progress = false;
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-163-	wake_up(&dev->wait);
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-166-}
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:167:EXPORT_SYMBOL_GPL(mt7925_mcu_regd_update);
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-168-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c=169=void mt7925_regd_notifier(struct wiphy *wiphy, struct regulatory_request *req)
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-193-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:194:	dev->regd_change = true;
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-195-
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-199-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:200:	mt7925_mcu_regd_update(dev, req->alpha2,
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-201-			       req->country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c=206=mt7925_regd_is_valid_alpha2(const char *alpha2)
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-219-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:220:int mt7925_regd_change(struct mt792x_phy *phy, char *alpha2)
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-221-{
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-248-}
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:249:EXPORT_SYMBOL_GPL(mt7925_regd_change);
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-250-
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.h-8-
drivers/net/wireless/mediatek/mt76/mt7925/regd.h:9:int mt7925_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7925/regd.h-10-			   enum environment_cap country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.h=14=bool mt7925_regd_clc_supported(struct mt792x_dev *dev);
drivers/net/wireless/mediatek/mt76/mt7925/regd.h:15:int mt7925_regd_change(struct mt792x_phy *phy, char *alpha2);
drivers/net/wireless/mediatek/mt76/mt7925/regd.h-16-int mt7925_regd_init(struct mt792x_phy *phy);
--
drivers/net/wireless/mediatek/mt76/mt792x.h=240=struct mt792x_dev {
--
drivers/net/wireless/mediatek/mt76/mt792x.h-256-	bool regd_user:1;
drivers/net/wireless/mediatek/mt76/mt792x.h:257:	bool regd_in_progress:1;
drivers/net/wireless/mediatek/mt76/mt792x.h-258-	bool aspm_supported:1;
--
drivers/net/wireless/mediatek/mt76/mt792x.h-260-	bool hif_resumed:1;
drivers/net/wireless/mediatek/mt76/mt792x.h:261:	bool regd_change:1;
drivers/net/wireless/mediatek/mt76/mt792x.h-262-	wait_queue_head_t wait;
]

gemini-3.6-flash

							input: 13818
							output: 50
							thoughts: 182
						

**Diving Deep into the MT79xx Wireless Driver Landscape**

Okay, so I need to understand this regulatory domain update process better within the MT79xx family. My initial instinct is to branch out, see how the MT7925 and MT7921 drivers are handling this. What's the parallel here? Are they architected similarly? I'm specifically interested in how they're handling these regulatory updates, and the 6 GHz power settings.

I need to quickly compare the `mt7921_mcu_regd_update` and `__mt7921_mcu_regd_update` functions. The use of `mt7921_regd_set_6ghz_power_type` should illuminate the differences. Is there some subtle variance with `mt7925`? Or are they doing the same thing but differently?

Okay, maybe there's an issue there, so before I get to far down the rabbit hole, let's compare MT7921 and MT7925 directly. Alternatively, I should probably just check what's going on in other files within `mt7921`.

Right, let's step back and get specific. I should read `drivers/net/wireless/mediatek/mt76/mt7921/main.c`, focusing on lines 760-810. That's where the core logic likely resides. Let's see how that unfolds in code, maybe a particular function call will unlock this.

map[File:drivers/net/wireless/mediatek/mt76/mt7921/main.c FirstLine:760 LineCount:50]

map[Contents: 760:		default:
 761:			break;
 762:		}
 763:	}
 764:	
 765:	static void
 766:	mt7921_regd_set_6ghz_power_type(struct ieee80211_vif *vif, bool is_add)
 767:	{
 768:		struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;
 769:		struct mt792x_phy *phy = mvif->phy;
 770:		struct mt792x_dev *dev = phy->dev;
 771:		u32 valid_vif_num = 0;
 772:	
 773:		ieee80211_iterate_active_interfaces(mt76_hw(dev),
 774:						    IEEE80211_IFACE_ITER_RESUME_ALL,
 775:						    mt7921_calc_vif_num, &valid_vif_num);
 776:	
 777:		if (valid_vif_num > 1) {
 778:			phy->power_type = MT_AP_DEFAULT;
 779:			goto out;
 780:		}
 781:	
 782:		if (!is_add)
 783:			vif->bss_conf.power_type = IEEE80211_REG_UNSET_AP;
 784:	
 785:		switch (vif->bss_conf.power_type) {
 786:		case IEEE80211_REG_SP_AP:
 787:			phy->power_type = MT_AP_SP;
 788:			break;
 789:		case IEEE80211_REG_VLP_AP:
 790:			phy->power_type = MT_AP_VLP;
 791:			break;
 792:		case IEEE80211_REG_LPI_AP:
 793:			phy->power_type = MT_AP_LPI;
 794:			break;
 795:		case IEEE80211_REG_UNSET_AP:
 796:			phy->power_type = MT_AP_UNSET;
 797:			break;
 798:		default:
 799:			phy->power_type = MT_AP_DEFAULT;
 800:			break;
 801:		}
 802:	
 803:	out:
 804:		if (vif->bss_conf.chanreq.oper.chan->band == NL80211_BAND_6GHZ)
 805:			__mt7921_mcu_regd_update(dev, dev->mt76.alpha2, dev->country_ie_env);
 806:	}
 807:	
 808:	int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 809:			       struct ieee80211_sta *sta)
]

gemini-3.6-flash

							input: 15262
							output: 57
							thoughts: 76
						

**Investigating the mt7921 6 GHz Power Type Configuration**

Okay, so I need to understand how the power type is being set for 6 GHz operation in the `mt7921` driver. My first instinct is to trace the call paths for that `mt7921_regd_set_6ghz_power_type` function. This is standard operating procedure – figuring out where a critical function is invoked is the key to understanding its overall behaviour and impact. Let's start with a thorough search specifically within the `drivers/net/wireless/mediatek/mt76/mt7921/` directory. That's the most logical place to begin, given that this function clearly belongs to the `mt7921` wireless driver. I'm expecting this will likely point me toward the regulatory domain initialization, or perhaps a power management handler, or maybe even something related to channel configuration. Time to dig in!

map[Expression:mt7921_regd_set_6ghz_power_type PathPrefix:drivers/net/wireless/mediatek/mt76/mt7921/]

map[Output:drivers/net/wireless/mediatek/mt76/mt7921/main.c=765=static void
drivers/net/wireless/mediatek/mt76/mt7921/main.c:766:mt7921_regd_set_6ghz_power_type(struct ieee80211_vif *vif, bool is_add)
drivers/net/wireless/mediatek/mt76/mt7921/main.c-767-{
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=808=int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-849-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:850:	mt7921_regd_set_6ghz_power_type(vif, true);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-851-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=891=void mt7921_mac_sta_remove(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-920-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:921:	mt7921_regd_set_6ghz_power_type(vif, false);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-922-
]

gemini-3.6-flash

							input: 16094
							output: 45
							thoughts: 106
						

**Investigating 6 GHz Power Settings in mt79xx Drivers**

Okay, so I'm looking at the `mt7921` driver code, specifically the functions `mt7921_mac_sta_add` and `mt7921_mac_sta_remove`. It seems like both of those call `mt7921_regd_set_6ghz_power_type(vif, ...)`. A likely scenario is that this function manages power-related settings for 6 GHz operation, which makes perfect sense.

But wait a minute... I need to be thorough. I wonder if the `mt7925` driver also has something similar. It's a related chipset, so it would be strange if it handled 6 GHz power differently. I'll need to double-check the `mt7925` code. There could be an equivalent function with a similar name like `mt7925_regd_set_6ghz_power_type`, or something along those lines. Let's dig in and see. That's the next logical step.

map[Expression:regd_set_6ghz_power_type PathPrefix:drivers/net/wireless/mediatek/mt76/]

map[Output:drivers/net/wireless/mediatek/mt76/mt7921/main.c=765=static void
drivers/net/wireless/mediatek/mt76/mt7921/main.c:766:mt7921_regd_set_6ghz_power_type(struct ieee80211_vif *vif, bool is_add)
drivers/net/wireless/mediatek/mt76/mt7921/main.c-767-{
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=808=int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-849-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:850:	mt7921_regd_set_6ghz_power_type(vif, true);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-851-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=891=void mt7921_mac_sta_remove(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-920-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:921:	mt7921_regd_set_6ghz_power_type(vif, false);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-922-
]

gemini-3.6-flash

							input: 16982
							output: 50
							thoughts: 90
						

Okay, here's my interpretation of that thought process, tailored for an expert audience:

**Analyzing MT7925 Regulatory Domain Support**

Alright, so the immediate assumption, based on past experience, is that the MT7925 doesn't have the `regd_set_6ghz_power_type` configuration option directly. My first instinct here is to clarify this.

Now, hold on. Before I jump to any conclusions, I need to thoroughly investigate. I'm going to start by scrutinizing commit `d6e7d57ed967`. That seems like a likely starting point for changes related to regulatory domain handling. I need to understand the intent and the impact of that specific commit, in case it affects how 6GHz power limits are handled.

To do this, I need to check the relevant source files. I'm specifically going to focus on `drivers/net/wireless/mediatek/mt76/mt7921/regd.c`, and more specifically around lines 70-120. I'll need to see how the regulatory domain data structures are defined for the mt7921, any power limit structures or related code that may have been added, and, critically, how the `regd_set_6ghz_power_type` function, or its equivalent, might be used or referenced within that context. I need to see if it's there at all, or if a different mechanism is in place. It's possible the logic is implicitly handled elsewhere, or using a different function. This might give me a clue as to why it's not present on the MT7925 directly.

map[File:drivers/net/wireless/mediatek/mt76/mt7921/regd.c FirstLine:70 LineCount:60]

map[Contents:  70:				ch->flags |= IEEE80211_CHAN_DISABLED;
  71:		}
  72:	}
  73:	
  74:	/* Internal version that assumes mutex is already held by caller */
  75:	int __mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
  76:				     enum environment_cap country_ie_env)
  77:	{
  78:		struct mt76_dev *mdev = &dev->mt76;
  79:		struct ieee80211_hw *hw = mdev->hw;
  80:		struct wiphy *wiphy = hw->wiphy;
  81:		int ret = 0;
  82:	
  83:		if (!dev->regd_change)
  84:			return 0;
  85:	
  86:		ret = mt7921_mcu_set_clc(dev, alpha2, country_ie_env);
  87:		if (ret < 0)
  88:			return ret;
  89:	
  90:		mt7921_regd_channel_update(wiphy, dev);
  91:	
  92:		ret = mt76_connac_mcu_set_channel_domain(hw->priv);
  93:		if (ret < 0)
  94:			return ret;
  95:	
  96:		ret = mt7921_set_tx_sar_pwr(hw, NULL);
  97:	
  98:		return ret;
  99:	}
 100:	
 101:	int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
 102:				   enum environment_cap country_ie_env)
 103:	{
 104:		int ret = 0;
 105:	
 106:		dev->regd_in_progress = true;
 107:	
 108:		mt792x_mutex_acquire(dev);
 109:		ret = __mt7921_mcu_regd_update(dev, alpha2, country_ie_env);
 110:		mt792x_mutex_release(dev);
 111:	
 112:		dev->regd_change = false;
 113:		dev->regd_in_progress = false;
 114:		wake_up(&dev->wait);
 115:	
 116:		return ret;
 117:	}
 118:	EXPORT_SYMBOL_GPL(mt7921_mcu_regd_update);
 119:	
 120:	void mt7921_regd_notifier(struct wiphy *wiphy,
 121:				  struct regulatory_request *req)
 122:	{
 123:		struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 124:		struct mt792x_dev *dev = mt792x_hw_dev(hw);
 125:		struct mt76_connac_pm *pm = &dev->pm;
 126:		struct mt76_dev *mdev = &dev->mt76;
 127:	
 128:		if (req->initiator == NL80211_REGDOM_SET_BY_USER &&
 129:		    !dev->regd_user)
]

gemini-3.6-flash

							input: 18450
							output: 25
							thoughts: 615
						

**Analyzing the Regulatory Domain Update in mt7921 Driver**

Okay, let's break this down. I'm looking at the `mt7921_regd_set_6ghz_power_type` function, and it seems like it's calling `__mt7921_mcu_regd_update` under the specific condition that the channel's band is 6GHz. Intriguing.

Hold on, before I go further, let me zoom in on `__mt7921_mcu_regd_update`.  The first thing it does is check `dev->regd_change`. If it's *not* true, it returns early.  So, here's the crucial question: is `dev->regd_change` actually set to true *before* `mt7921_regd_set_6ghz_power_type` gets called?

Right, need to see where `dev->regd_change` is *modified*. Let's see...  Ah, I see it's set to `true` in both `mt7921_regd_notifier` and `mt7921_regd_change`, and set back to `false` in `mt7921_mcu_regd_update`.

Now, going back to `mt7921_regd_set_6ghz_power_type`, it's called from both `mt7921_mac_sta_add` and `mt7921_mac_sta_remove`.  Why is it triggering a regulatory update when we're dealing with station additions or removals specifically?  Doesn't quite line up.

When we're changing the 6GHz power type (LPI, VLP, SP), `phy->power_type` is set.  So, the intent of the change is to update power type... but *why* is it calling `mt7921_mcu_regd_update` then?  It seems redundant. It seems `mt7921_mcu_regd_update` was previously called. And the prior `mt7921_mcu_regd_update` function would check `!dev->regd_change`.  Should `dev->regd_change` be true or false when the 6GHz power type changes? That doesn't seem right. Why is `dev->regd_change` being modified when changing the 6GHz power type?

I need to dig into the context here. I'll need to check the commit history, maybe use `git blame` or `git show` on commit `dc2608cf5224` ("wifi: mt76: mt7921: refactor regulatory notifier flow") to understand the rationale behind this code.  Hopefully, that'll shed some light on the design decision here.

log-in to see details

map[Commit:dc2608cf5224]

map[Output:]

gemini-3.6-flash

							input: 19767
							output: 41
							thoughts: 63
						

**Investigating a Potentially Relevant Commit**

Okay, so I've got this commit hash, `dc2608cf5224`, floating around in my head, and I'm thinking it could very well be a commit from the wireless or mt76 trees. Given my knowledge of the codebase, I have a hunch it might be relevant to regulatory notifier flow changes. So, let's get down to brass tacks and search the git log. The most direct way to identify its impact is with a search. I'll execute a `git log` command, focusing on commit messages. I'll specifically use the regex "refactor regulatory notifier flow" as the search string, to zero in on any commits that explicitly mention those critical keywords. That should reveal all relevant commits in the log.

map[MessageRegexps:[refactor regulatory notifier flow] PathPrefix:drivers/net/wireless/mediatek/mt76/]

map[Output:d6e7d57ed967 wifi: mt76: mt7921: refactor regd update to fix recursive mutex deadlock
e88098133ed4 wifi: mt76: mt7921: refactor regulatory notifier flow
330510085907 wifi: mt76: mt7925: refactor regulatory notifier flow
]

gemini-3.6-flash

							input: 20147
							output: 26
							thoughts: 41
						

Here's a summary of my thought process, as if I were analyzing that `git-show` command:

**Deep Dive into Commit e88098133ed4**

Okay, let's pull up the details for commit `e88098133ed4`. That's the one titled "wifi: mt76: mt7921: refactor regulatory notifier flow". Right off the bat, that "refactor" keyword grabs my attention. Knowing the `mt76` and `mt7921` drivers, I expect this is going to be about improving how the regulatory domain information is handled, probably for the Mediatek 802.11ax chipset. The "notifier flow" part suggests it likely involves changes to how regulatory events (country codes, allowed channels, power limits) are propagated through the system, possibly from the kernel’s regulatory database to the driver. I wonder if they’ve managed to simplify the callback structure or if they've addressed any race conditions related to the asynchronous nature of regulatory updates. I'll need to look closely at the specific changes. I anticipate seeing adjustments to the `cfg80211` interfaces, maybe some new notifier chains, or possibly a restructuring of the internal state management within the `mt7921` driver itself. Time to dive in and see how they actually implemented the refactoring. My initial hypothesis is that they're either enhancing the robustness or streamlining the process, or likely both. I am very interested to see how they've optimized the driver for minimal latency with a focus on real time performance.

map[Commit:e88098133ed4]

map[Output:commit e88098133ed45f5fbe1cd29fde19ee3ef827de1b
Author: JB Tsai <jb.tsai@mediatek.com>
Date:   Tue Mar 3 13:36:35 2026 +0800

    wifi: mt76: mt7921: refactor regulatory notifier flow
    
    Rename mt7921_regd_update() to mt7921_mcu_regd_update() to centralize
    regd updates with error handling.
    
    Co-developed-by: Sean Wang <sean.wang@mediatek.com>
    Signed-off-by: Sean Wang <sean.wang@mediatek.com>
    Signed-off-by: JB Tsai <jb.tsai@mediatek.com>
    Link: https://patch.msgid.link/20260303053637.465465-3-jb.tsai@mediatek.com
    Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 4ac26391a721..55ffd8eb8c6a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -802,7 +802,7 @@ mt7921_regd_set_6ghz_power_type(struct ieee80211_vif *vif, bool is_add)
 
 out:
 	if (vif->bss_conf.chanreq.oper.chan->band == NL80211_BAND_6GHZ)
-		mt7921_regd_update(dev);
+		mt7921_mcu_regd_update(dev, dev->mt76.alpha2, dev->country_ie_env);
 }
 
 int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
index 7ac0ca07278d..7728c5ae6791 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -589,7 +589,7 @@ static int mt7921_pci_resume(struct device *device)
 	if (err < 0)
 		goto failed;
 
-	mt7921_regd_update(dev);
+	mt7921_mcu_regd_update(dev, mdev->alpha2, dev->country_ie_env);
 	err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_ON_LED);
 failed:
 	pm->suspended = false;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/regd.c b/drivers/net/wireless/mediatek/mt76/mt7921/regd.c
index 943342984965..fa753e8e041d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/regd.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/regd.c
@@ -71,18 +71,43 @@ mt7921_regd_channel_update(struct wiphy *wiphy, struct mt792x_dev *dev)
 	}
 }
 
-void mt7921_regd_update(struct mt792x_dev *dev)
+int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
+			   enum environment_cap country_ie_env)
 {
 	struct mt76_dev *mdev = &dev->mt76;
 	struct ieee80211_hw *hw = mdev->hw;
 	struct wiphy *wiphy = hw->wiphy;
+	int ret = 0;
+
+	dev->regd_in_progress = true;
+
+	mt792x_mutex_acquire(dev);
+	if (!dev->regd_change)
+		goto err;
+
+	ret = mt7921_mcu_set_clc(dev, alpha2, country_ie_env);
+	if (ret < 0)
+		goto err;
 
-	mt7921_mcu_set_clc(dev, mdev->alpha2, dev->country_ie_env);
 	mt7921_regd_channel_update(wiphy, dev);
-	mt76_connac_mcu_set_channel_domain(hw->priv);
-	mt7921_set_tx_sar_pwr(hw, NULL);
+
+	ret = mt76_connac_mcu_set_channel_domain(hw->priv);
+	if (ret < 0)
+		goto err;
+
+	ret = mt7921_set_tx_sar_pwr(hw, NULL);
+	if (ret < 0)
+		goto err;
+
+err:
+	mt792x_mutex_release(dev);
+	dev->regd_change = false;
+	dev->regd_in_progress = false;
+	wake_up(&dev->wait);
+
+	return ret;
 }
-EXPORT_SYMBOL_GPL(mt7921_regd_update);
+EXPORT_SYMBOL_GPL(mt7921_mcu_regd_update);
 
 void mt7921_regd_notifier(struct wiphy *wiphy,
 			  struct regulatory_request *request)
@@ -105,12 +130,6 @@ void mt7921_regd_notifier(struct wiphy *wiphy,
 	if (pm->suspended)
 		return;
 
-	dev->regd_in_progress = true;
-
-	mt792x_mutex_acquire(dev);
-	mt7921_regd_update(dev);
-	mt792x_mutex_release(dev);
-
-	dev->regd_in_progress = false;
-	wake_up(&dev->wait);
+	mt7921_mcu_regd_update(dev, request->alpha2,
+			       request->country_ie_env);
 }
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/regd.h b/drivers/net/wireless/mediatek/mt76/mt7921/regd.h
index ece85feb7a23..c7dcf747843c 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/regd.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/regd.h
@@ -8,7 +8,8 @@ struct mt792x_dev;
 struct wiphy;
 struct regulatory_request;
 
-void mt7921_regd_update(struct mt792x_dev *dev);
+int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
+			   enum environment_cap country_ie_env);
 void mt7921_regd_notifier(struct wiphy *wiphy,
 			  struct regulatory_request *request);
 bool mt7921_regd_clc_supported(struct mt792x_dev *dev);
]

gemini-3.6-flash

							input: 22693
							output: 51
							thoughts: 1099
						

**Analyzing Regulatory Domain Updates in the MT7921 Driver**

Okay, here's the deal. I'm digging into this regulatory domain update flow for the MT7921 Wi-Fi driver, specifically looking at commit `e88098133ed4` ("wifi: mt76: mt7921: refactor regulatory notifier flow"). Before this commit, the function `mt7921_regd_update(dev)` didn't bother checking `dev->regd_change`. But now, with `e88098133ed4`, there's a crucial `if (!dev->regd_change) goto err;` in `mt7921_mcu_regd_update`. This means calls from places like `mt7921_regd_set_6ghz_power_type` or `mt7921_pci_resume`, where `dev->regd_change` isn't necessarily set to `true`, could silently fail or return early.

Then, there's commit `d6e7d57ed967` to consider. I remember that one was introduced to fix a recursive deadlock issue, specifically where `mt7921_regd_set_6ghz_power_type` was calling the regulatory domain update functions while holding `dev->mt76.mutex` or `mt792x_mutex_acquire(dev)`.

So, let's carefully re-examine `d6e7d57ed967`. I'm specifically looking at the `__mt7921_mcu_regd_update` function in that commit. There's an `if (!dev->regd_change) return 0;` block there.

Now, my key question is: Is `dev->regd_change` properly set *within* `mt7921_regd_set_6ghz_power_type`? I recall that it *is* set to `true` in `mt7921_regd_notifier` and `mt7921_regd_change`. But when `mt7921_regd_set_6ghz_power_type` gets called within `mt7921_mac_sta_add` or `mt7921_mac_sta_remove`, that flag is FALSE! This seems odd.

So, *why* is `mt7921_regd_set_6ghz_power_type` even calling `__mt7921_mcu_regd_update` in the first place? Ah, I think I see it. When `mt7921_regd_set_6ghz_power_type` changes the `phy->power_type`, it *wants* the MCU to update regulatory domain parameters (via `mt7921_mcu_set_clc` and so on) to reflect this 6GHz power change. But if `dev->regd_change` is false, `__mt7921_mcu_regd_update` returns 0 without doing anything!

Therefore, the question becomes: Is `dev->regd_change` supposed to be set in these cases or should it be ignored? This looks like a potential issue... What about the `pci_resume` case? I know it calls `mt7921_mcu_regd_update` and am now curious about how `regd_change` is handled during resume. In `mt7921_pci_resume` there is:
`mt7921_mcu_regd_update(dev, mdev->alpha2, dev->country_ie_env);`
but I'm not clear on how `dev->regd_change` is handled during `pci_resume`. I need to review the code around `pci_resume` and `pci_suspend` in `pci.c`.

Okay, I'm diving into `drivers/net/wireless/mediatek/mt76/mt7921/pci.c`, specifically around lines 580-600, to get a better handle on this PCI resume flow and see if I can figure out the intended behavior and what might be going wrong with that `dev->regd_change` flag. This could be a significant regulatory compliance issue.

map[File:drivers/net/wireless/mediatek/mt76/mt7921/pci.c FirstLine:570 LineCount:35]

map[Contents: 570:		mt76_worker_enable(&mdev->tx_worker);
 571:	
 572:		mt76_for_each_q_rx(mdev, i) {
 573:			napi_enable(&mdev->napi[i]);
 574:		}
 575:		napi_enable(&mdev->tx_napi);
 576:	
 577:		local_bh_disable();
 578:		mt76_for_each_q_rx(mdev, i) {
 579:			napi_schedule(&mdev->napi[i]);
 580:		}
 581:		napi_schedule(&mdev->tx_napi);
 582:		local_bh_enable();
 583:	
 584:		/* restore previous ds setting */
 585:		if (!pm->ds_enable)
 586:			mt76_connac_mcu_set_deep_sleep(&dev->mt76, false);
 587:	
 588:		err = mt76_connac_mcu_set_hif_suspend(mdev, false, true);
 589:		if (err < 0)
 590:			goto failed;
 591:	
 592:		mt7921_mcu_regd_update(dev, mdev->alpha2, dev->country_ie_env);
 593:		err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_ON_LED);
 594:	failed:
 595:		pm->suspended = false;
 596:	
 597:		if (err < 0)
 598:			mt792x_reset(&dev->mt76);
 599:	
 600:		return err;
 601:	}
 602:	
 603:	static void mt7921_pci_shutdown(struct pci_dev *pdev)
 604:	{
]

gemini-3.6-flash

							input: 25389
							output: 21
							thoughts: 266
						

**Analyzing `mt7921_mcu_regd_update` Usage**

Okay, hold on a second. Before I proceed, I need to thoroughly analyze the usage of `mt7921_mcu_regd_update`. Let's start by listing out every instance of that function or its internal counterpart, `__mt7921_mcu_regd_update`, across all our files. I've already noted a few.

Specifically, in `main.c`, `__mt7921_mcu_regd_update` gets called from `mt7921_regd_set_6ghz_power_type`. The arguments are straightforward, taking the device, its `alpha2` value, and the `country_ie_env`. That's one.

Then, in `pci.c`, I see `mt7921_mcu_regd_update` being called in `mt7921_pci_resume`. Looks like the arguments are similar, device information, alpha2, country_ie_env, but they're using a different device variable `mdev` as input.

And finally, in `regd.c`, it's called from `mt7921_regd_notifier`. Here, it uses a request `req` structure. Same function, but the source and purpose of the call looks different.

Now, just to be absolutely certain I haven't missed anything, I'm going to run a broader search across the entire codebase for any other instances of `mcu_regd_update` with or without the specific prefix. Gotta be absolutely certain I have the whole picture before I jump to any conclusions. This will take a second.

map[Expression:mcu_regd_update]

map[Output:drivers/net/wireless/mediatek/mt76/mt7921/main.c=766=mt7921_regd_set_6ghz_power_type(struct ieee80211_vif *vif, bool is_add)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-804-	if (vif->bss_conf.chanreq.oper.chan->band == NL80211_BAND_6GHZ)
drivers/net/wireless/mediatek/mt76/mt7921/main.c:805:		__mt7921_mcu_regd_update(dev, dev->mt76.alpha2, dev->country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-806-}
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c=545=static int mt7921_pci_resume(struct device *device)
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-591-
drivers/net/wireless/mediatek/mt76/mt7921/pci.c:592:	mt7921_mcu_regd_update(dev, mdev->alpha2, dev->country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-593-	err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_ON_LED);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c=23=mt7921_regd_channel_update(struct wiphy *wiphy, struct mt792x_dev *dev)
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-74-/* Internal version that assumes mutex is already held by caller */
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:75:int __mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-76-			     enum environment_cap country_ie_env)
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-100-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:101:int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-102-			   enum environment_cap country_ie_env)
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-108-	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:109:	ret = __mt7921_mcu_regd_update(dev, alpha2, country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-110-	mt792x_mutex_release(dev);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-117-}
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:118:EXPORT_SYMBOL_GPL(mt7921_mcu_regd_update);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-119-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c=120=void mt7921_regd_notifier(struct wiphy *wiphy,
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-152-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:153:	mt7921_mcu_regd_update(dev, req->alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-154-			       req->country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.h=9=struct regulatory_request;
drivers/net/wireless/mediatek/mt76/mt7921/regd.h-10-
drivers/net/wireless/mediatek/mt76/mt7921/regd.h:11:int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.h-12-			   enum environment_cap country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7921/regd.h:13:int __mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7921/regd.h-14-			     enum environment_cap country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7925/pci.c=597=static int _mt7925_pci_resume(struct device *device, bool restore)
--
drivers/net/wireless/mediatek/mt76/mt7925/pci.c-654-
drivers/net/wireless/mediatek/mt76/mt7925/pci.c:655:	mt7925_mcu_regd_update(dev, mdev->alpha2, dev->country_ie_env);
drivers/net/wireless/mediatek/mt76/mt7925/pci.c-656-failed:
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c=67=mt7925_regd_channel_update(struct wiphy *wiphy, struct mt792x_dev *dev)
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-130-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:131:int mt7925_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-132-			   enum environment_cap country_ie_env)
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-166-}
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:167:EXPORT_SYMBOL_GPL(mt7925_mcu_regd_update);
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-168-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c=169=void mt7925_regd_notifier(struct wiphy *wiphy, struct regulatory_request *req)
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-199-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:200:	mt7925_mcu_regd_update(dev, req->alpha2,
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-201-			       req->country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.h-8-
drivers/net/wireless/mediatek/mt76/mt7925/regd.h:9:int mt7925_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
drivers/net/wireless/mediatek/mt76/mt7925/regd.h-10-			   enum environment_cap country_ie_env);
]

gemini-3.6-flash

							input: 28293
							output: 51
							thoughts: 1200
						

**Analyzing the Region Database Update Mechanism**

Okay, let's break this down. My initial observation focuses on how the region database (regd) updates are handled, specifically within the MT7921 driver. I'm seeing a critical distinction in how `__mt7921_mcu_regd_update` is called and how the `regd_change` flag is managed.

First, I examine the code flow: it's calling `__mt7921_mcu_regd_update`. I note that `__mt7921_mcu_regd_update` has a guard: `if (!dev->regd_change) return 0;`. This early exit is crucial, and it depends on the value of `dev->regd_change`.

Then, I observe the calling function `mt7921_mcu_regd_update`. Here, I find a proper setup: `dev->regd_in_progress` is set, the mutex is acquired, `__mt7921_mcu_regd_update` is called, `dev->regd_change` is reset to `false`, and `dev->regd_in_progress` is reset, followed by a wake-up. This is the intended path for a full regd update.

The critical issue arises when `__mt7921_mcu_regd_update` is called directly, specifically from `mt7921_regd_set_6ghz_power_type`. Here, the important setup steps in `mt7921_mcu_regd_update` are skipped: `dev->regd_in_progress` is *not* set, and `dev->regd_change` is *not* set to `false`. This directly impacts that first `if` statement! My immediate concern: is `dev->regd_change` predictably true when `mt7921_regd_set_6ghz_power_type` calls `__mt7921_mcu_regd_update`? The answer is probably not.

This leads me to the next question: Why is `mt7921_regd_set_6ghz_power_type` being called from places like `mt7921_mac_sta_add` and `mt7921_mac_sta_remove`? The power type shouldn't directly trigger a region database update in those situations.

I then focus on the code within `mt7921_regd_set_6ghz_power_type` itself.  I see that it calls `__mt7921_mcu_regd_update` based on a band check. But crucially, *there's no setting of `dev->regd_change` to true within this function*. Therefore, that critical guard in `__mt7921_mcu_regd_update` is likely to block the update.

I then think: What was the code like before commit `d6e7d57ed967`? I realize that prior to that change, the `mt7921_mcu_regd_update` function *also* did nothing if `dev->regd_change` was false. This raises the question: was the design supposed to work this way previously? The `dev->regd_change` flag seems to be the linchpin, and the issue lies in *when* and *where* it is set and reset. I wonder if there's a disconnect between how the power type changes and the intended regd update flow, or if this check was wrong in the power type changes and when resume happens.

I shift my attention to the `mt7921_pci_resume` function. I see `mt7921_mcu_regd_update` is called, which again, triggers the question: Is `dev->regd_change` true at this point? I can't be sure without tracking down how that flag is being used.

My next step is clear. I must systematically search the entire MT7921 codebase to identify *all* instances of `regd_change` being set, used, and cleared. This involves looking in all the relevant files: `mt7921`, `mt7925`, and `mt792x`, to fully understand the life cycle of this flag.

I start by finding the call to `mt7921_regd_change` in `mac.c`.  I see that this function is how the flag gets set. I now will look at the implementation of `mt792

map[File:drivers/net/wireless/mediatek/mt76/mt7921/regd.c FirstLine:140 LineCount:50]

map[Contents: 140:	
 141:		if (req->initiator == NL80211_REGDOM_SET_BY_USER) {
 142:			if (dev->mt76.alpha2[0] == '0' && dev->mt76.alpha2[1] == '0')
 143:				wiphy->regulatory_flags &= ~REGULATORY_COUNTRY_IE_IGNORE;
 144:			else
 145:				wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_IGNORE;
 146:		}
 147:	
 148:		dev->regd_change = true;
 149:	
 150:		if (pm->suspended)
 151:			return;
 152:	
 153:		mt7921_mcu_regd_update(dev, req->alpha2,
 154:				       req->country_ie_env);
 155:	}
 156:	
 157:	static bool
 158:	mt7921_regd_is_valid_alpha2(const char *alpha2)
 159:	{
 160:		if (!alpha2)
 161:			return false;
 162:	
 163:		if (alpha2[0] == '0' && alpha2[1] == '0')
 164:			return true;
 165:	
 166:		if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
 167:			return true;
 168:	
 169:		return false;
 170:	}
 171:	
 172:	int mt7921_regd_change(struct mt792x_phy *phy, char *alpha2)
 173:	{
 174:		struct wiphy *wiphy = phy->mt76->hw->wiphy;
 175:		struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 176:		struct mt792x_dev *dev = mt792x_hw_dev(hw);
 177:		struct mt76_dev *mdev = &dev->mt76;
 178:	
 179:		if (dev->hw_full_reset)
 180:			return 0;
 181:	
 182:		if (!mt7921_regd_is_valid_alpha2(alpha2) ||
 183:		    !mt7921_regd_clc_supported(dev) ||
 184:		    dev->regd_user)
 185:			return -EINVAL;
 186:	
 187:		if (mdev->alpha2[0] != '0' && mdev->alpha2[1] != '0')
 188:			return 0;
 189:	
]

gemini-3.6-flash

							input: 31371
							output: 51
							thoughts: 23
						

Here's a summary of my thought process, as if I were the one thinking it:

**Diving into the `regd.c` Code**

Okay, I'm thinking I need to get a better handle on what's happening with this registration process. I've been reviewing the surrounding code, but it's not quite clicking. Right, I know, I should jump into `regd.c` and specifically focus on lines 190 through 220. That section likely holds a key piece of the puzzle. I'll need to analyze the logic there – understand any conditional checks, data manipulations, or function calls in that segment. Hopefully, these lines will clarify the process and shed some light on the issue I'm trying to resolve. This targeted approach is often the most efficient way to debug and understand this sort of code. Let's see what we can find!

map[File:drivers/net/wireless/mediatek/mt76/mt7921/regd.c FirstLine:190 LineCount:30]

map[Contents: 190:		/* do not need to update the same country twice */
 191:		if (!memcmp(alpha2, mdev->alpha2, 2))
 192:			return 0;
 193:	
 194:		if (phy->chip_cap & MT792x_CHIP_CAP_11D_EN)
 195:			return regulatory_hint(wiphy, alpha2);
 196:		else
 197:			return mt7921_mcu_set_clc(dev, alpha2, ENVIRON_INDOOR);
 198:	}
 199:	
 200:	int mt7921_regd_init(struct mt792x_phy *phy)
 201:	{
 202:		struct wiphy *wiphy = phy->mt76->hw->wiphy;
 203:		struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 204:		struct mt792x_dev *dev = mt792x_hw_dev(hw);
 205:		struct mt76_dev *mdev = &dev->mt76;
 206:	
 207:		if (phy->chip_cap & MT792x_CHIP_CAP_11D_EN)
 208:			wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_IGNORE |
 209:						   REGULATORY_DISABLE_BEACON_HINTS;
 210:		else
 211:			memzero_explicit(&mdev->alpha2, sizeof(mdev->alpha2));
 212:	
 213:		return 0;
 214:	}
]

gemini-3.6-flash

							input: 32111
							output: 51
							thoughts: 844
						

**A Deep Dive into MT7921 Regulatory Domain Updates**

Okay, hold on a second. I'm looking at this `mt7921_regd_set_6ghz_power_type` function, and something's not sitting right. When it modifies `phy->power_type` (like switching to LPI, VLP, SP, or UNSET), it *should* be updating the CLC, channel domain, and TX SAR power on the MCU. It does this by calling `__mt7921_mcu_regd_update`, which *seems* correct. But, when digging into `__mt7921_mcu_regd_update`, there's this `if (!dev->regd_change)` check. If `dev->regd_change` is false, it just *returns* without doing anything: no `mt7921_mcu_set_clc`, nothing!

And that's where the problem lies. The power type is changing in `mt7921_regd_set_6ghz_power_type`, but this doesn't automatically trigger `dev->regd_change`. In fact, it never seems to be set when the power type is updated. So, even though `mt7921_regd_set_6ghz_power_type` *calls* `__mt7921_mcu_regd_update`, the function *does nothing* because `dev->regd_change` is falsely evaluated, effectively *silencing* the power type update to the MCU! We're not sending the 6GHz power type changes to the MCU at all!

Now, let's explore PCI resume. `mt7921_pci_resume` also calls `mt7921_mcu_regd_update`. But wait, is `dev->regd_change` set *before* this call? Looking at `mt7921_pci_suspend`, it's not setting `dev->regd_change` either. If `dev->regd_change` was somehow set *before* the suspend (say in `mt7921_regd_notifier` when `pm->suspended` was true), then on resume `mt7921_mcu_regd_update` would run and clear `dev->regd_change = false;`. But, if it was false before suspend, on resume, `mt7921_mcu_regd_update` will again do *nothing* because of the `if (!dev->regd_change)` check!

So, the next obvious step is to compare this behavior to the MT7925 device. Let's see how `mt7925` handles `mt7925_mcu_regd_update` and other regd changes. Time to dive into `drivers/net/wireless/mediatek/mt76/mt7925/regd.c`.

map[File:drivers/net/wireless/mediatek/mt76/mt7925/regd.c FirstLine:120 LineCount:50]

map[Contents: 120:			if (IS_UNII_INVALID(1, 5925, 6425, ch->center_freq) ||
 121:			    IS_UNII_INVALID(2, 6425, 6525, ch->center_freq) ||
 122:			    IS_UNII_INVALID(3, 6525, 6875, ch->center_freq) ||
 123:			    IS_UNII_INVALID(4, 6875, 7125, ch->center_freq))
 124:				ch->flags |= IEEE80211_CHAN_DISABLED;
 125:	
 126:			if (!dev->has_eht)
 127:				ch->flags |= IEEE80211_CHAN_NO_EHT;
 128:		}
 129:	}
 130:	
 131:	int mt7925_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
 132:				   enum environment_cap country_ie_env)
 133:	{
 134:		struct ieee80211_hw *hw = mt76_hw(dev);
 135:		struct wiphy *wiphy = hw->wiphy;
 136:		int ret = 0;
 137:	
 138:		dev->regd_in_progress = true;
 139:	
 140:		mt792x_mutex_acquire(dev);
 141:		if (!dev->regd_change)
 142:			goto err;
 143:	
 144:		ret = mt7925_mcu_set_clc(dev, alpha2, country_ie_env);
 145:		if (ret < 0)
 146:			goto err;
 147:	
 148:		mt7925_regd_be_ctrl(dev, alpha2);
 149:		mt7925_regd_channel_update(wiphy, dev);
 150:	
 151:		ret = mt7925_mcu_set_channel_domain(hw->priv);
 152:		if (ret < 0)
 153:			goto err;
 154:	
 155:		ret = mt7925_set_tx_sar_pwr(hw, NULL);
 156:		if (ret < 0)
 157:			goto err;
 158:	
 159:	err:
 160:		mt792x_mutex_release(dev);
 161:		dev->regd_change = false;
 162:		dev->regd_in_progress = false;
 163:		wake_up(&dev->wait);
 164:	
 165:		return ret;
 166:	}
 167:	EXPORT_SYMBOL_GPL(mt7925_mcu_regd_update);
 168:	
 169:	void mt7925_regd_notifier(struct wiphy *wiphy, struct regulatory_request *req)
]

gemini-3.6-flash

							input: 34538
							output: 51
							thoughts: 578
						

**Analyzing the Regulatory Domain Update in mt7921 Driver**

Okay, let's dive into this `d6e7d57ed967` commit. I see they've changed a function call in `mt7921/main.c`. Specifically, they've swapped `mt7921_mcu_regd_update` for `__mt7921_mcu_regd_update` within the `mt7921_regd_set_6ghz_power_type` function. Interesting... I need to understand why this was necessary.

My immediate thought is, was `mt7921_mcu_regd_update` causing a recursive mutex deadlock? The change suggests they were addressing a locking issue. I'll bet it's because `mt7921_regd_set_6ghz_power_type` is called from within `mt7921_mac_sta_add` and `mt7921_mac_sta_remove`. It seems like those functions, and therefore the regulatory domain update, were being called from places where they shouldn't have been. That makes perfect sense.

Let me take a look at the surrounding code in `main.c` now to confirm this. I need to refresh my memory on the interactions of these functions. Okay, give me lines 808-930, let's see what's going on... I need to see how `mt7921_mac_sta_add` and `mt7921_mac_sta_remove` are structured. The mutex likely protects the regulatory domain update, so something about those STA management routines was causing it to be called when it shouldn't.

map[File:drivers/net/wireless/mediatek/mt76/mt7921/main.c FirstLine:808 LineCount:100]

map[Contents: 808:	int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 809:			       struct ieee80211_sta *sta)
 810:	{
 811:		struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
 812:		struct mt792x_sta *msta = (struct mt792x_sta *)sta->drv_priv;
 813:		struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;
 814:		int ret, idx;
 815:	
 816:		if (sta->aid > MT7921_MAX_AID)
 817:			return -ENOENT;
 818:	
 819:		idx = mt76_wcid_alloc(dev->mt76.wcid_mask, MT792x_WTBL_STA - 1);
 820:		if (idx < 0)
 821:			return -ENOSPC;
 822:	
 823:		INIT_LIST_HEAD(&msta->deflink.wcid.poll_list);
 824:		msta->vif = mvif;
 825:		msta->deflink.wcid.sta = 1;
 826:		msta->deflink.wcid.idx = idx;
 827:		msta->deflink.wcid.phy_idx = mvif->bss_conf.mt76.band_idx;
 828:		msta->deflink.wcid.tx_info |= MT_WCID_TX_INFO_SET;
 829:		msta->deflink.last_txs = jiffies;
 830:		msta->deflink.sta = msta;
 831:	
 832:		if (sta->tdls)
 833:			set_bit(MT_WCID_FLAG_TDLS_PEER, &msta->deflink.wcid.flags);
 834:	
 835:		ret = mt76_connac_pm_wake(&dev->mphy, &dev->pm);
 836:		if (ret)
 837:			return ret;
 838:	
 839:		if (vif->type == NL80211_IFTYPE_STATION)
 840:			mvif->wep_sta = msta;
 841:	
 842:		mt7921_mac_wtbl_update(dev, idx,
 843:				       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
 844:	
 845:		ret = mt7921_mcu_sta_update(dev, sta, vif, true,
 846:					    MT76_STA_INFO_STATE_NONE);
 847:		if (ret)
 848:			return ret;
 849:	
 850:		mt7921_regd_set_6ghz_power_type(vif, true);
 851:	
 852:		mt76_connac_power_save_sched(&dev->mphy, &dev->pm);
 853:	
 854:		return 0;
 855:	}
 856:	EXPORT_SYMBOL_GPL(mt7921_mac_sta_add);
 857:	
 858:	int mt7921_mac_sta_event(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 859:				 struct ieee80211_sta *sta, enum mt76_sta_event ev)
 860:	{
 861:		struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
 862:		struct mt792x_sta *msta = (struct mt792x_sta *)sta->drv_priv;
 863:		struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;
 864:	
 865:		if (sta->aid > MT7921_MAX_AID)
 866:			return -ENOENT;
 867:	
 868:		if (ev != MT76_STA_EVENT_ASSOC)
 869:		    return 0;
 870:	
 871:		mt792x_mutex_acquire(dev);
 872:	
 873:		if (vif->type == NL80211_IFTYPE_STATION && !sta->tdls)
 874:			mt76_connac_mcu_uni_add_bss(&dev->mphy, vif, &mvif->sta.deflink.wcid,
 875:						    true, mvif->bss_conf.mt76.ctx);
 876:	
 877:		ewma_avg_signal_init(&msta->deflink.avg_ack_signal);
 878:	
 879:		mt7921_mac_wtbl_update(dev, msta->deflink.wcid.idx,
 880:				       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
 881:		memset(msta->deflink.airtime_ac, 0, sizeof(msta->deflink.airtime_ac));
 882:	
 883:		mt7921_mcu_sta_update(dev, sta, vif, true, MT76_STA_INFO_STATE_ASSOC);
 884:	
 885:		mt792x_mutex_release(dev);
 886:	
 887:		return 0;
 888:	}
 889:	EXPORT_SYMBOL_GPL(mt7921_mac_sta_event);
 890:	
 891:	void mt7921_mac_sta_remove(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 892:				   struct ieee80211_sta *sta)
 893:	{
 894:		struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
 895:		struct mt792x_sta *msta = (struct mt792x_sta *)sta->drv_priv;
 896:	
 897:		mt7921_roc_abort_sync(dev);
 898:		mt76_connac_free_pending_tx_skbs(&dev->pm, &msta->deflink.wcid);
 899:		mt76_connac_pm_wake(&dev->mphy, &dev->pm);
 900:	
 901:		mt7921_mcu_sta_update(dev, sta, vif, false, MT76_STA_INFO_STATE_NONE);
 902:		mt7921_mac_wtbl_update(dev, msta->deflink.wcid.idx,
 903:				       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
 904:	
 905:		if (vif->type == NL80211_IFTYPE_STATION) {
 906:			struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;
 907:	
]

gemini-3.6-flash

							input: 37597
							output: 25
							thoughts: 116
						

**Investigating the MAC STA Management in mt7921**

Okay, let's dive into this. My initial thought is to trace the execution flow related to station (STA) management in the `mt7921` driver. I need to understand who's calling the `mt7921_mac_sta_add` and `mt7921_mac_sta_remove` functions. I also want to identify the contexts where that `mt792x_mutex_acquire(dev)` is being called, because mutex usage is key to understanding potential concurrency issues.

But, before I get too deep into specific functions, let's broaden the net a bit. I should search for calls to functions like `sta_add` too, or functions beginning with `mt7921_mac_sta_add`. More broadly, I should look for all the `ops` related to station adding and removal within the `mt7921` module. I need to be comprehensive to get a clear picture of how STAs are integrated into the driver.

Finally, I'll revisit `mt7921_mac_sta_add` directly. I need to know where it's called from and how it's exposed in the operations structures. This will give me a very specific view of how it fits into the overall driver architecture.

map[Expression:mt7921_mac_sta_add]

map[Output:drivers/net/wireless/mediatek/mt76/mt7921/main.c=766=mt7921_regd_set_6ghz_power_type(struct ieee80211_vif *vif, bool is_add)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-807-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:808:int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7921/main.c-809-		       struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-855-}
drivers/net/wireless/mediatek/mt76/mt7921/main.c:856:EXPORT_SYMBOL_GPL(mt7921_mac_sta_add);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-857-
--
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h=264=bool mt7921_mac_wtbl_update(struct mt792x_dev *dev, int idx, u32 mask);
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h:265:int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h-266-		       struct ieee80211_sta *sta);
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c=259=static int mt7921_pci_probe(struct pci_dev *pdev,
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-275-		.rx_poll_complete = mt792x_rx_poll_complete,
drivers/net/wireless/mediatek/mt76/mt7921/pci.c:276:		.sta_add = mt7921_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-277-		.sta_event = mt7921_mac_sta_event,
--
drivers/net/wireless/mediatek/mt76/mt7921/sdio.c=90=static int mt7921s_probe(struct sdio_func *func,
--
drivers/net/wireless/mediatek/mt76/mt7921/sdio.c-103-		.rx_check = mt7921_rx_check,
drivers/net/wireless/mediatek/mt76/mt7921/sdio.c:104:		.sta_add = mt7921_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7921/sdio.c-105-		.sta_event = mt7921_mac_sta_event,
--
drivers/net/wireless/mediatek/mt76/mt7921/usb.c=150=static int mt7921u_probe(struct usb_interface *usb_intf,
--
drivers/net/wireless/mediatek/mt76/mt7921/usb.c-164-		.rx_check = mt7921_rx_check,
drivers/net/wireless/mediatek/mt76/mt7921/usb.c:165:		.sta_add = mt7921_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7921/usb.c-166-		.sta_event = mt7921_mac_sta_event,
]

gemini-3.6-flash

							input: 39112
							output: 36
							thoughts: 177
						

**Analyzing the `sta_add` Call Flow**

Okay, so `sta_add` is a `mt76_ops` callback. Right, that means either mac80211 or `mt76` itself is calling it. The key question now is *who* is calling `mdev->drv->sta_add` within the mac80211/`mt76` framework? I need to trace this back.

Let's see… in `mt76`, `mt76_sta_add` seems to be the one responsible, and it directly calls `mdev->drv->sta_add(mdev, vif, sta)`. Now, here's where it gets interesting. I need to make sure that `mt76_sta_add` is called with the proper locking mechanism, specifically `dev->mt76.mutex` or possibly the `mt792x_mutex_acquire`. I need to verify that the mutex is held, or if any similar lock is held. That's crucial for the driver's thread safety. Time to search for calls to `mt76_sta_add` in `drivers/net/wireless/mediatek/mt76/`.

map[Expression:sta_add PathPrefix:drivers/net/wireless/mediatek/mt76/]

map[Output:drivers/net/wireless/mediatek/mt76/mac80211.c=1575=static int
drivers/net/wireless/mediatek/mt76/mac80211.c:1576:mt76_sta_add(struct mt76_phy *phy, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mac80211.c-1577-	     struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mac80211.c-1586-
drivers/net/wireless/mediatek/mt76/mac80211.c:1587:	ret = dev->drv->sta_add(dev, vif, sta);
drivers/net/wireless/mediatek/mt76/mac80211.c-1588-	if (ret)
--
drivers/net/wireless/mediatek/mt76/mac80211.c=1651=int mt76_sta_state(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mac80211.c-1665-	    new_state == IEEE80211_STA_NONE)
drivers/net/wireless/mediatek/mt76/mac80211.c:1666:		return mt76_sta_add(phy, vif, sta);
drivers/net/wireless/mediatek/mt76/mac80211.c-1667-
--
drivers/net/wireless/mediatek/mt76/mt76.h=543=struct mt76_driver_ops {
--
drivers/net/wireless/mediatek/mt76/mt76.h-577-
drivers/net/wireless/mediatek/mt76/mt76.h:578:	int (*sta_add)(struct mt76_dev *dev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt76.h-579-		       struct ieee80211_sta *sta);
--
drivers/net/wireless/mediatek/mt76/mt7603/init.c=8=const struct mt76_driver_ops mt7603_drv_ops = {
--
drivers/net/wireless/mediatek/mt76/mt7603/init.c-16-	.sta_ps = mt7603_sta_ps,
drivers/net/wireless/mediatek/mt76/mt7603/init.c:17:	.sta_add = mt7603_sta_add,
drivers/net/wireless/mediatek/mt76/mt7603/init.c-18-	.sta_event = mt7603_sta_event,
--
drivers/net/wireless/mediatek/mt76/mt7603/main.c=326=int
drivers/net/wireless/mediatek/mt76/mt7603/main.c:327:mt7603_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7603/main.c-328-	       struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mt7603/mt7603.h=246=void mt7603_sta_ps(struct mt76_dev *mdev, struct ieee80211_sta *sta, bool ps);
drivers/net/wireless/mediatek/mt76/mt7603/mt7603.h:247:int mt7603_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7603/mt7603.h-248-		   struct ieee80211_sta *sta);
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c=246=static void mt7615_remove_interface(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c-257-	mt7615_mcu_add_bss_info(phy, vif, NULL, false);
drivers/net/wireless/mediatek/mt76/mt7615/main.c:258:	mt7615_mcu_sta_add(phy, vif, NULL, false);
drivers/net/wireless/mediatek/mt76/mt7615/main.c-259-
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c=567=static void mt7615_bss_info_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c-587-		mt7615_mcu_add_bss_info(phy, vif, NULL, true);
drivers/net/wireless/mediatek/mt76/mt7615/main.c:588:		mt7615_mcu_sta_add(phy, vif, NULL, true);
drivers/net/wireless/mediatek/mt76/mt7615/main.c-589-
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c=623=mt7615_channel_switch_beacon(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c-633-
drivers/net/wireless/mediatek/mt76/mt7615/main.c:634:int mt7615_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7615/main.c-635-		       struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c-665-			       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
drivers/net/wireless/mediatek/mt76/mt7615/main.c:666:	err = mt7615_mcu_sta_add(&dev->phy, vif, sta, true);
drivers/net/wireless/mediatek/mt76/mt7615/main.c-667-	if (err)
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c-673-}
drivers/net/wireless/mediatek/mt76/mt7615/main.c:674:EXPORT_SYMBOL_GPL(mt7615_mac_sta_add);
drivers/net/wireless/mediatek/mt76/mt7615/main.c-675-
drivers/net/wireless/mediatek/mt76/mt7615/main.c=676=void mt7615_mac_sta_remove(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c-688-
drivers/net/wireless/mediatek/mt76/mt7615/main.c:689:	mt7615_mcu_sta_add(&dev->phy, vif, sta, false);
drivers/net/wireless/mediatek/mt76/mt7615/main.c-690-	mt7615_mac_wtbl_update(dev, msta->wcid.idx,
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c=862=static int
drivers/net/wireless/mediatek/mt76/mt7615/main.c:863:mt7615_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7615/main.c-864-	       struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c=1318=const struct ieee80211_ops mt7615_ops = {
--
drivers/net/wireless/mediatek/mt76/mt7615/main.c-1331-	.bss_info_changed = mt7615_bss_info_changed,
drivers/net/wireless/mediatek/mt76/mt7615/main.c:1332:	.sta_add = mt7615_sta_add,
drivers/net/wireless/mediatek/mt76/mt7615/main.c-1333-	.sta_remove = mt7615_sta_remove,
--
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c=839=static int
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c:840:mt7615_mcu_wtbl_sta_add(struct mt7615_phy *phy, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-841-			struct ieee80211_sta *sta, bool enable)
--
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-861-	if (!sta) {
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c:862:		if (mvif->sta_added)
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-863-			new_entry = false;
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-864-		else
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c:865:			mvif->sta_added = true;
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-866-	}
--
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c=917=static const struct mt7615_mcu_ops wtbl_update_ops = {
--
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-923-	.add_rx_ba = mt7615_mcu_wtbl_rx_ba,
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c:924:	.sta_add = mt7615_mcu_wtbl_sta_add,
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-925-	.set_drv_ctrl = mt7615_mcu_drv_pmctrl,
--
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c=1017=static const struct mt7615_mcu_ops sta_update_ops = {
--
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-1023-	.add_rx_ba = mt7615_mcu_sta_rx_ba,
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c:1024:	.sta_add = mt7615_mcu_add_sta,
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-1025-	.set_drv_ctrl = mt7615_mcu_drv_pmctrl,
--
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c=1208=static const struct mt7615_mcu_ops uni_update_ops = {
--
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-1214-	.add_rx_ba = mt7615_mcu_uni_rx_ba,
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c:1215:	.sta_add = mt7615_mcu_uni_add_sta,
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c-1216-	.set_drv_ctrl = mt7615_mcu_lp_drv_pmctrl,
--
drivers/net/wireless/mediatek/mt76/mt7615/mmio.c=166=int mt7615_mmio_probe(struct device *pdev, void __iomem *mem_base,
--
drivers/net/wireless/mediatek/mt76/mt7615/mmio.c-181-		.rx_poll_complete = mt7615_rx_poll_complete,
drivers/net/wireless/mediatek/mt76/mt7615/mmio.c:182:		.sta_add = mt7615_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7615/mmio.c-183-		.sta_remove = mt7615_mac_sta_remove,
--
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h=142=struct mt7615_vif {
--
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h-144-	struct mt7615_sta sta;
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h:145:	bool sta_added;
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h-146-};
--
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h=157=struct mt7615_phy {
--
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h-209-#define mt7615_mcu_add_rx_ba(dev, ...)	(dev)->mcu_ops->add_rx_ba((dev), __VA_ARGS__)
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h:210:#define mt7615_mcu_sta_add(phy, ...)	((phy)->dev)->mcu_ops->sta_add((phy),  __VA_ARGS__)
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h-211-#define mt7615_mcu_add_dev_info(phy, ...) ((phy)->dev)->mcu_ops->add_dev_info((phy),  __VA_ARGS__)
--
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h=218=struct mt7615_mcu_ops {
--
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h-224-			 bool enable);
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h:225:	int (*sta_add)(struct mt7615_phy *phy, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h-226-		       struct ieee80211_sta *sta, bool enable);
--
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h=505=void mt7615_queue_rx_skb(struct mt76_dev *mdev, enum mt76_rxq_id q,
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h-506-			 struct sk_buff *skb, u32 *info);
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h:507:int mt7615_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h-508-		       struct ieee80211_sta *sta);
--
drivers/net/wireless/mediatek/mt76/mt7615/sdio.c=76=static int mt7663s_probe(struct sdio_func *func,
--
drivers/net/wireless/mediatek/mt76/mt7615/sdio.c-86-		.rx_check = mt7615_rx_check,
drivers/net/wireless/mediatek/mt76/mt7615/sdio.c:87:		.sta_add = mt7615_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7615/sdio.c-88-		.sta_remove = mt7615_mac_sta_remove,
--
drivers/net/wireless/mediatek/mt76/mt7615/usb.c=112=static int mt7663u_probe(struct usb_interface *usb_intf,
--
drivers/net/wireless/mediatek/mt76/mt7615/usb.c-122-		.rx_check = mt7615_rx_check,
drivers/net/wireless/mediatek/mt76/mt7615/usb.c:123:		.sta_add = mt7615_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7615/usb.c-124-		.sta_remove = mt7615_mac_sta_remove,
--
drivers/net/wireless/mediatek/mt76/mt76x0/pci.c=154=mt76x0e_probe(struct pci_dev *pdev, const struct pci_device_id *id)
--
drivers/net/wireless/mediatek/mt76/mt76x0/pci.c-168-		.sta_ps = mt76x02_sta_ps,
drivers/net/wireless/mediatek/mt76/mt76x0/pci.c:169:		.sta_add = mt76x02_sta_add,
drivers/net/wireless/mediatek/mt76/mt76x0/pci.c-170-		.sta_remove = mt76x02_sta_remove,
--
drivers/net/wireless/mediatek/mt76/mt76x0/usb.c=213=static int mt76x0u_probe(struct usb_interface *usb_intf,
--
drivers/net/wireless/mediatek/mt76/mt76x0/usb.c-226-		.sta_ps = mt76x02_sta_ps,
drivers/net/wireless/mediatek/mt76/mt76x0/usb.c:227:		.sta_add = mt76x02_sta_add,
drivers/net/wireless/mediatek/mt76/mt76x0/usb.c-228-		.sta_remove = mt76x02_sta_remove,
--
drivers/net/wireless/mediatek/mt76/mt76x02.h=152=void mt76x02_configure_filter(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt76x02.h-154-			      unsigned int *total_flags, u64 multicast);
drivers/net/wireless/mediatek/mt76/mt76x02.h:155:int mt76x02_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt76x02.h-156-		    struct ieee80211_sta *sta);
--
drivers/net/wireless/mediatek/mt76/mt76x02_util.c=236=EXPORT_SYMBOL_GPL(mt76x02_configure_filter);
drivers/net/wireless/mediatek/mt76/mt76x02_util.c-237-
drivers/net/wireless/mediatek/mt76/mt76x02_util.c:238:int mt76x02_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt76x02_util.c-239-		    struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mt76x02_util.c-264-}
drivers/net/wireless/mediatek/mt76/mt76x02_util.c:265:EXPORT_SYMBOL_GPL(mt76x02_sta_add);
drivers/net/wireless/mediatek/mt76/mt76x02_util.c-266-
--
drivers/net/wireless/mediatek/mt76/mt76x2/pci.c=20=mt76x2e_probe(struct pci_dev *pdev, const struct pci_device_id *id)
--
drivers/net/wireless/mediatek/mt76/mt76x2/pci.c-34-		.sta_ps = mt76x02_sta_ps,
drivers/net/wireless/mediatek/mt76/mt76x2/pci.c:35:		.sta_add = mt76x02_sta_add,
drivers/net/wireless/mediatek/mt76/mt76x2/pci.c-36-		.sta_remove = mt76x02_sta_remove,
--
drivers/net/wireless/mediatek/mt76/mt76x2/usb.c=32=static int mt76x2u_probe(struct usb_interface *intf,
--
drivers/net/wireless/mediatek/mt76/mt76x2/usb.c-45-		.sta_ps = mt76x02_sta_ps,
drivers/net/wireless/mediatek/mt76/mt76x2/usb.c:46:		.sta_add = mt76x02_sta_add,
drivers/net/wireless/mediatek/mt76/mt76x2/usb.c-47-		.sta_remove = mt76x02_sta_remove,
--
drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c=1477=DEFINE_SHOW_ATTRIBUTE(mt7915_queues);
drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c-1478-
drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c:1479:void mt7915_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c-1480-			    struct ieee80211_sta *sta, struct dentry *dir)
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c=731=mt7915_channel_switch_beacon(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c-741-
drivers/net/wireless/mediatek/mt76/mt7915/main.c:742:int mt7915_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7915/main.c-743-		       struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c=775=struct drop_sta_iter {
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c-778-	struct ieee80211_vif *vif;
drivers/net/wireless/mediatek/mt76/mt7915/main.c:779:	u8 sta_addr[ETH_ALEN];
drivers/net/wireless/mediatek/mt76/mt7915/main.c-780-};
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c=783=__mt7915_drop_sta(void *ptr, u8 *mac, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c-791-
drivers/net/wireless/mediatek/mt76/mt7915/main.c:792:	sta = ieee80211_find_sta_by_ifaddr(data->hw, data->sta_addr, mac);
drivers/net/wireless/mediatek/mt76/mt7915/main.c-793-	if (!sta)
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c=803=mt7915_drop_other_sta(struct mt7915_dev *dev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c-815-
drivers/net/wireless/mediatek/mt76/mt7915/main.c:816:	memcpy(data.sta_addr, sta->addr, ETH_ALEN);
drivers/net/wireless/mediatek/mt76/mt7915/main.c-817-	ieee80211_iterate_active_interfaces(data.hw, 0, __mt7915_drop_sta, &data);
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c=1765=const struct ieee80211_ops mt7915_ops = {
--
drivers/net/wireless/mediatek/mt76/mt7915/main.c-1815-#ifdef CONFIG_MAC80211_DEBUGFS
drivers/net/wireless/mediatek/mt76/mt7915/main.c:1816:	.sta_add_debugfs = mt7915_sta_add_debugfs,
drivers/net/wireless/mediatek/mt76/mt7915/main.c-1817-#endif
--
drivers/net/wireless/mediatek/mt76/mt7915/mmio.c=917=struct mt7915_dev *mt7915_mmio_probe(struct device *pdev,
--
drivers/net/wireless/mediatek/mt76/mt7915/mmio.c-933-		.rx_poll_complete = mt7915_rx_poll_complete,
drivers/net/wireless/mediatek/mt76/mt7915/mmio.c:934:		.sta_add = mt7915_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7915/mmio.c-935-		.sta_event = mt7915_mac_sta_event,
--
drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h=581=void mt7915_mac_set_timing(struct mt7915_phy *phy);
drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h:582:int mt7915_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h-583-		       struct ieee80211_sta *sta);
--
drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h=617=bool mt7915_debugfs_rx_log(struct mt7915_dev *dev, const void *data, int len);
drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h-618-#ifdef CONFIG_MAC80211_DEBUGFS
drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h:619:void mt7915_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h-620-			    struct ieee80211_sta *sta, struct dentry *dir);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=766=mt7921_regd_set_6ghz_power_type(struct ieee80211_vif *vif, bool is_add)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-807-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:808:int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7921/main.c-809-		       struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-855-}
drivers/net/wireless/mediatek/mt76/mt7921/main.c:856:EXPORT_SYMBOL_GPL(mt7921_mac_sta_add);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-857-
--
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h=264=bool mt7921_mac_wtbl_update(struct mt792x_dev *dev, int idx, u32 mask);
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h:265:int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h-266-		       struct ieee80211_sta *sta);
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c=259=static int mt7921_pci_probe(struct pci_dev *pdev,
--
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-275-		.rx_poll_complete = mt792x_rx_poll_complete,
drivers/net/wireless/mediatek/mt76/mt7921/pci.c:276:		.sta_add = mt7921_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7921/pci.c-277-		.sta_event = mt7921_mac_sta_event,
--
drivers/net/wireless/mediatek/mt76/mt7921/sdio.c=90=static int mt7921s_probe(struct sdio_func *func,
--
drivers/net/wireless/mediatek/mt76/mt7921/sdio.c-103-		.rx_check = mt7921_rx_check,
drivers/net/wireless/mediatek/mt76/mt7921/sdio.c:104:		.sta_add = mt7921_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7921/sdio.c-105-		.sta_event = mt7921_mac_sta_event,
--
drivers/net/wireless/mediatek/mt76/mt7921/usb.c=150=static int mt7921u_probe(struct usb_interface *usb_intf,
--
drivers/net/wireless/mediatek/mt76/mt7921/usb.c-164-		.rx_check = mt7921_rx_check,
drivers/net/wireless/mediatek/mt76/mt7921/usb.c:165:		.sta_add = mt7921_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7921/usb.c-166-		.sta_event = mt7921_mac_sta_event,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=859=mt7925_get_rates_table(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-886-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:887:static int mt7925_mac_link_sta_add(struct mt76_dev *mdev,
drivers/net/wireless/mediatek/mt76/mt7925/main.c-888-				   struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1027-/*
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1028: * Host-only unwind for sta_add_links() failures.
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1029- *
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1066=static int
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1067:mt7925_mac_sta_add_links(struct mt792x_dev *dev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1068-			 struct ieee80211_sta *sta, unsigned long new_links)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1095-		link_sta = mt792x_sta_to_link_sta(vif, sta, link_id);
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1096:		err = mt7925_mac_link_sta_add(&dev->mt76, vif, link_sta, mlink);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1097-		if (err) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1117-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1118:int mt7925_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1119-		       struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1133-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1134:		err = mt7925_mac_sta_add_links(dev, vif, sta, sta->valid_links);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1135-	} else {
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1136:		err = mt7925_mac_link_sta_add(mdev, vif, &sta->deflink,
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1137-					      &msta->deflink);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1141-}
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1142:EXPORT_SYMBOL_GPL(mt7925_mac_sta_add);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1143-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2235=mt7925_change_sta_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2251-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2252:	err = mt7925_mac_sta_add_links(dev, vif, sta, add);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2253-	if (err < 0)
--
drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h=293=int mt7925_mac_init(struct mt792x_dev *dev);
drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h:294:int mt7925_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h-295-		       struct ieee80211_sta *sta);
--
drivers/net/wireless/mediatek/mt76/mt7925/pci.c=313=static int mt7925_pci_probe(struct pci_dev *pdev,
--
drivers/net/wireless/mediatek/mt76/mt7925/pci.c-329-		.rx_poll_complete = mt792x_rx_poll_complete,
drivers/net/wireless/mediatek/mt76/mt7925/pci.c:330:		.sta_add = mt7925_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7925/pci.c-331-		.sta_event = mt7925_mac_sta_event,
--
drivers/net/wireless/mediatek/mt76/mt7925/usb.c=143=static int mt7925u_probe(struct usb_interface *usb_intf,
--
drivers/net/wireless/mediatek/mt76/mt7925/usb.c-157-		.rx_check = mt7925_rx_check,
drivers/net/wireless/mediatek/mt76/mt7925/usb.c:158:		.sta_add = mt7925_mac_sta_add,
drivers/net/wireless/mediatek/mt76/mt7925/usb.c-159-		.sta_event = mt7925_mac_sta_event,
--
drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c=983=DEFINE_SHOW_ATTRIBUTE(mt7996_queues);
drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c-984-
drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c:985:void mt7996_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c-986-			    struct ieee80211_sta *sta, struct dentry *dir)
--
drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c=1064=static const struct file_operations fops_fixed_rate = {
--
drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c-1070-
drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c:1071:void mt7996_link_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c-1072-				 struct ieee80211_link_sta *link_sta,
--
drivers/net/wireless/mediatek/mt76/mt7996/main.c=1258=static int
drivers/net/wireless/mediatek/mt76/mt7996/main.c:1259:mt7996_mac_sta_add_links(struct mt7996_dev *dev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7996/main.c-1260-			 struct ieee80211_sta *sta, unsigned long new_links)
--
drivers/net/wireless/mediatek/mt76/mt7996/main.c=1320=mt7996_mac_sta_change_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7996/main.c-1331-	mt7996_mac_sta_remove_links(dev, vif, sta, rem, false);
drivers/net/wireless/mediatek/mt76/mt7996/main.c:1332:	ret = mt7996_mac_sta_add_links(dev, vif, sta, add);
drivers/net/wireless/mediatek/mt76/mt7996/main.c-1333-
--
drivers/net/wireless/mediatek/mt76/mt7996/main.c=1339=static int
drivers/net/wireless/mediatek/mt76/mt7996/main.c:1340:mt7996_mac_sta_add(struct mt7996_dev *dev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7996/main.c-1341-		   struct ieee80211_sta *sta)
--
drivers/net/wireless/mediatek/mt76/mt7996/main.c-1352-	msta->vif = mvif;
drivers/net/wireless/mediatek/mt76/mt7996/main.c:1353:	err = mt7996_mac_sta_add_links(dev, vif, sta, links);
drivers/net/wireless/mediatek/mt76/mt7996/main.c-1354-
--
drivers/net/wireless/mediatek/mt76/mt7996/main.c=1468=mt7996_sta_state(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7996/main.c-1476-	    new_state == IEEE80211_STA_NONE)
drivers/net/wireless/mediatek/mt76/mt7996/main.c:1477:		return mt7996_mac_sta_add(dev, vif, sta);
drivers/net/wireless/mediatek/mt76/mt7996/main.c-1478-
--
drivers/net/wireless/mediatek/mt76/mt7996/main.c=2510=const struct ieee80211_ops mt7996_ops = {
--
drivers/net/wireless/mediatek/mt76/mt7996/main.c-2559-#ifdef CONFIG_MAC80211_DEBUGFS
drivers/net/wireless/mediatek/mt76/mt7996/main.c:2560:	.sta_add_debugfs = mt7996_sta_add_debugfs,
drivers/net/wireless/mediatek/mt76/mt7996/main.c:2561:	.link_sta_add_debugfs = mt7996_link_sta_add_debugfs,
drivers/net/wireless/mediatek/mt76/mt7996/main.c-2562-#endif
--
drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h=929=int mt7996_mcu_set_emlsr_mode(struct mt7996_dev *dev,
--
drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h-933-#ifdef CONFIG_MAC80211_DEBUGFS
drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h:934:void mt7996_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h-935-			    struct ieee80211_sta *sta, struct dentry *dir);
drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h:936:void mt7996_link_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h-937-				 struct ieee80211_link_sta *link_sta,
]

gemini-3.6-flash

							input: 52165
							output: 50
							thoughts: 3124
						

**Regulatory Domain Update Analysis: A Deep Dive into Commit d6e7d57ed967**

Alright, let's break down this regulatory domain update logic in the `mt7921` driver. I'm focusing on the evolution of `mt7921_mcu_regd_update` and its internal counterpart `__mt7921_mcu_regd_update`, and pinpointing the issues introduced (or exposed) by commit `d6e7d57ed967`. I need to ensure a correct and reliable method for updating the country code.

My initial examination highlights a critical change. Before commit `d6e7d57ed967`, the primary function `mt7921_regd_update` was a straightforward operation. However, after the changes in the commit, it was split into `mt7921_mcu_regd_update` and `__mt7921_mcu_regd_update`.  The `__` version now requires the mutex to be held and introduces a check for `dev->regd_change`. The non-`__` version handles the mutex acquisition and release and also the condition where the flag is reset after performing the operation.

First, I realize a fundamental problem with the new check inside `__mt7921_mcu_regd_update`. The `dev->regd_change` flag is not necessarily set *before* calling `__mt7921_mcu_regd_update` from `mt7921_regd_set_6ghz_power_type()`. That means the update will return prematurely. This suggests that `mt7921_regd_set_6ghz_power_type()` *should* set this flag before calling the update, or the update function must clear the flag.

Second, the `dev->regd_change = false;` is in the outer `mt7921_mcu_regd_update()` function, NOT in the internal `__mt7921_mcu_regd_update()` function. If another entity sets `dev->regd_change` true and then calls `__mt7921_mcu_regd_update()` then regd_change will stay true. This means the internal function might run multiple times, even if the regulatory domain is not changed and the setting has not been altered.

Third, I'm concerned about the interaction with `dev->regd_in_progress` and the `wait_event_timeout` in the suspend function. The current logic indicates that the internal function is called directly from `mt7921_regd_set_6ghz_power_type()`. This means there is a potential race condition with the suspend process, as `dev->regd_in_progress` is not set.

Finally, a quick review of the call paths to `mt7921_regd_set_6ghz_power_type()` (specifically from `mt7921_mac_sta_add()` and `mt7921_mac_sta_remove()`) reveals that it is *not* called with the mutex already held. This makes the race condition and flag-setting issues even more critical. There is a disconnect because there is no protection around the power type setting.

Therefore, this commit introduced the following flaws:

1.  `dev->regd_change` isn't set before calling the internal function which causes early exits.
2.  `dev->regd_change` flag is not reset inside the internal function causing the driver to execute the regulatory update multiple times when it shouldn't.
3.  Improper protection and potential race conditions with suspend.

I need to develop a correct fix that takes care of the flag properly. There are several options: set the flag to true before calling the function, check to see if we should set the flag in the internal function, or move the flag to be cleared in the internal function.

map[File:drivers/net/wireless/mediatek/mt76/mt7921/main.c FirstLine:891 LineCount:40]

map[Contents: 891:	void mt7921_mac_sta_remove(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 892:				   struct ieee80211_sta *sta)
 893:	{
 894:		struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
 895:		struct mt792x_sta *msta = (struct mt792x_sta *)sta->drv_priv;
 896:	
 897:		mt7921_roc_abort_sync(dev);
 898:		mt76_connac_free_pending_tx_skbs(&dev->pm, &msta->deflink.wcid);
 899:		mt76_connac_pm_wake(&dev->mphy, &dev->pm);
 900:	
 901:		mt7921_mcu_sta_update(dev, sta, vif, false, MT76_STA_INFO_STATE_NONE);
 902:		mt7921_mac_wtbl_update(dev, msta->deflink.wcid.idx,
 903:				       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
 904:	
 905:		if (vif->type == NL80211_IFTYPE_STATION) {
 906:			struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;
 907:	
 908:			mvif->wep_sta = NULL;
 909:			ewma_rssi_init(&mvif->bss_conf.rssi);
 910:			if (!sta->tdls)
 911:				mt76_connac_mcu_uni_add_bss(&dev->mphy, vif,
 912:							    &mvif->sta.deflink.wcid, false,
 913:							    mvif->bss_conf.mt76.ctx);
 914:		}
 915:	
 916:		spin_lock_bh(&dev->mt76.sta_poll_lock);
 917:		if (!list_empty(&msta->deflink.wcid.poll_list))
 918:			list_del_init(&msta->deflink.wcid.poll_list);
 919:		spin_unlock_bh(&dev->mt76.sta_poll_lock);
 920:	
 921:		mt7921_regd_set_6ghz_power_type(vif, false);
 922:	
 923:		mt76_connac_power_save_sched(&dev->mphy, &dev->pm);
 924:	}
 925:	EXPORT_SYMBOL_GPL(mt7921_mac_sta_remove);
 926:	
 927:	static int mt7921_set_rts_threshold(struct ieee80211_hw *hw, int radio_idx,
 928:					    u32 val)
 929:	{
 930:		struct mt792x_dev *dev = mt792x_hw_dev(hw);
]

gemini-3.6-flash

							input: 57104
							output: 23
							thoughts: 222
						

**Investigating Potential Deadlock in mt7921 Driver**

Okay, hold on a second. I need to take a closer look at the `mt7921_mac_sta_add()` and `mt7921_mac_sta_remove()` functions. Something feels off – neither of them seems to be acquiring `mt792x_mutex_acquire(dev)`. That's a red flag.

Wait a minute, I need to remind myself, the commit message for `d6e7d57ed967` explicitly mentions fixing a deadlock issue related to `mt7921_regd_set_6ghz_power_type()`. It says the deadlock occurs when that function is called with the device mutex already held!

That raises a crucial question in my mind, Why would `mt7921_regd_set_6ghz_power_type` *ever* be called with the mutex already held? Is this a driver bug, or is the mutex somehow being acquired by mac80211, or elsewhere in the stack, and it's something I'm missing? That makes sense. Let's make sure I'm not crazy and that it does indeed acquire the mutex.

I need to dive into the implementation of `mt792x_mutex_acquire(dev)` to understand its behavior. Let's look up its definition and see what's actually happening under the hood. Time to dig in!

map[Expression:mt792x_mutex_acquire]

map[Output:
Full output is too long, showing 500 out of 585 lines.
Use more precise expression if possible.

drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=7=mt7921_reg_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-10-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:11:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-12-	mt76_wr(dev, dev->mt76.debugfs_reg, val);
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=19=mt7921_reg_get(void *data, u64 *val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-22-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:23:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-24-	*val = mt76_rr(dev, dev->mt76.debugfs_reg);
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=33=mt7921_fw_debug_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-36-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:37:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-38-
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=91=mt7921_txpwr(struct seq_file *s, void *data)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-96-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:97:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-98-	ret = mt7921_get_txpwr_info(dev, &txpwr);
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=188=mt7921_deep_sleep_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-197-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:198:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-199-	if (pm->ds_enable_user == enable)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=227=static int mt7921_chip_reset(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-238-		/* Collect the core dump before reset wifisys. */
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:239:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-240-		ret = mt76_connac_mcu_chip_config(&dev->mt76);
--
drivers/net/wireless/mediatek/mt76/mt7921/init.c=14=static ssize_t mt7921_thermal_temp_show(struct device *dev,
--
drivers/net/wireless/mediatek/mt76/mt7921/init.c-23-
drivers/net/wireless/mediatek/mt76/mt7921/init.c:24:		mt792x_mutex_acquire(mdev);
drivers/net/wireless/mediatek/mt76/mt7921/init.c-25-		temperature = mt7921_mcu_get_temperature(phy);
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c=842=bool mt7921_usb_sdio_tx_status_data(struct mt76_dev *mdev, u8 *update)
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-845-
drivers/net/wireless/mediatek/mt76/mt7921/mac.c:846:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-847-	mt7921_mac_sta_poll(dev);
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c=855=void mt7921_set_ipv6_ns_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-867-
drivers/net/wireless/mediatek/mt76/mt7921/mac.c:868:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-869-		ret = mt76_mcu_skb_send_msg(&dev->mt76, skb,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=272=static int mt7921_start(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-276-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:277:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-278-	err = __mt7921_start(phy);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=284=static void mt7921_stop(struct ieee80211_hw *hw, bool suspend)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-289-	if (mt76_is_mmio(&dev->mt76)) {
drivers/net/wireless/mediatek/mt76/mt7921/main.c:290:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-291-		err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_OFF_LED);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=301=mt7921_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-308-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:309:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-310-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=387=void mt7921_roc_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-393-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:394:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-395-	if (!test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state)) {
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=406=static int mt7921_abort_roc(struct mt792x_phy *phy, struct mt792x_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-412-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:413:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-414-	if (test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state))
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=451=static int mt7921_remain_on_channel(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-460-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:461:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-462-	err = mt7921_set_roc(phy, mvif, chan, duration, MT7921_ROC_REQ_ROC);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=502=static int mt7921_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-545-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:546:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-547-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=634=static int mt7921_config(struct ieee80211_hw *hw, int radio_idx, u32 changed)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-645-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:646:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-647-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=666=static void mt7921_configure_filter(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-687-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:688:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-689-	mt7921_mcu_set_rxfilter(dev, flags, 0, 0);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=695=static void mt7921_bss_info_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-702-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:703:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-704-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=858=int mt7921_mac_sta_event(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-870-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:871:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-872-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=927=static int mt7921_set_rts_threshold(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-931-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:932:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-933-	mt76_connac_mcu_set_rts_thresh(&dev->mt76, val, 0);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=940=mt7921_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-957-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:958:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-959-	switch (action) {
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=996=static int mt7921_sta_state(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1004-	if (dev->pm.ds_enable) {
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1005:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1006-		mt76_connac_sta_state_dp(&dev->mt76, old_state, new_state);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1055=mt7921_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1061-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1062:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1063-	err = mt76_connac_mcu_hw_scan(mphy, vif, req);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1070=mt7921_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1074-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1075:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1076-	mt76_connac_mcu_cancel_hw_scan(mphy, vif);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1081=mt7921_start_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1088-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1089:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1090-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1103=mt7921_stop_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1108-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1109:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1110-	err = mt76_connac_mcu_sched_scan_enable(mphy, vif, false);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1117=mt7921_set_antenna(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1129-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1130:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1131-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1144=static int mt7921_suspend(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1155-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1156:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1157-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1169=static int mt7921_resume(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1173-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1174:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1175-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1190=static void mt7921_set_rekey_data(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1195-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1196:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1197-	mt76_connac_mcu_update_gtk_rekey(hw, vif, data);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1202=static void mt7921_sta_set_decap_offload(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1212-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1213:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1214-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1302=static int mt7921_set_sar_specs(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1307-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1308:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1309-	err = mt7921_mcu_set_clc(dev, dev->mt76.alpha2,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1322=mt7921_channel_switch_beacon(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1327-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1328:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1329-	mt7921_mcu_uni_add_beacon_offload(dev, hw, vif, true);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1334=mt7921_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1341-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1342:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1343-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1362=mt7921_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1369-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1370:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1371-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1404=mt7921_change_chanctx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1418-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1419:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1420-	if (vif->type == NL80211_IFTYPE_MONITOR) {
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1429=static void mt7921_mgd_prepare_tx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1437-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1438:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1439-	mt7921_set_roc(mvif->phy, mvif, mvif->bss_conf.mt76.ctx->def.chan, duration,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1462=void mt7921_csa_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1473-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1474:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1475-	ret = mt76_connac_mcu_uni_set_chctx(mvif->phy->mt76, &mvif->bss_conf.mt76,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1536=static void mt7921_rfkill_poll(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1540-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1541:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1542-	ret = mt7921_mcu_wf_rf_pin_ctrl(phy, WF_RF_PIN_POLL);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c=101=int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-107-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:108:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-109-	ret = __mt7921_mcu_regd_update(dev, alpha2, country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=8=mt7925_reg_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-12-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:13:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-14-	mt7925_mcu_regval(dev, dev->mt76.debugfs_reg, &regval, true);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=21=mt7925_reg_get(void *data, u64 *val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-26-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:27:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-28-	ret = mt7925_mcu_regval(dev, dev->mt76.debugfs_reg, &regval, false);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=39=mt7925_fw_debug_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-42-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:43:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-44-
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=118=mt7925_txpwr(struct seq_file *s, void *data)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-129-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:130:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-131-	ret = mt7925_get_txpwr_info(dev, band_idx, txpwr);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=227=mt7925_deep_sleep_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-236-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:237:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-238-	if (pm->ds_enable_user == enable)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=266=static int mt7925_chip_reset(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-277-		/* Collect the core dump before reset wifisys. */
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:278:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-279-		ret = mt7925_mcu_chip_config(dev, "assert");
--
drivers/net/wireless/mediatek/mt76/mt7925/init.c=14=static ssize_t mt7925_thermal_temp_show(struct device *dev,
--
drivers/net/wireless/mediatek/mt76/mt7925/init.c-23-
drivers/net/wireless/mediatek/mt76/mt7925/init.c:24:		mt792x_mutex_acquire(mdev);
drivers/net/wireless/mediatek/mt76/mt7925/init.c-25-		temperature = mt7925_mcu_get_temperature(phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c=1484=bool mt7925_usb_sdio_tx_status_data(struct mt76_dev *mdev, u8 *update)
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1487-
drivers/net/wireless/mediatek/mt76/mt7925/mac.c:1488:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1489-	mt7925_mac_sta_poll(dev);
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c=1497=void mt7925_set_ipv6_ns_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1509-
drivers/net/wireless/mediatek/mt76/mt7925/mac.c:1510:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1511-		ret = mt76_mcu_skb_send_msg(&dev->mt76, skb,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=363=static int mt7925_start(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-367-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:368:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-369-	err = __mt7925_start(phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=451=mt7925_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-457-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:458:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-459-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=509=void mt7925_roc_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-518-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:519:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-520-	ieee80211_iterate_active_interfaces(phy->mt76->hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=527=static int mt7925_abort_roc(struct mt792x_phy *phy,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-534-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:535:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-536-	if (test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state))
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=600=static int mt7925_remain_on_channel(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-609-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:610:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-611-	err = mt7925_set_roc(phy, &mvif->bss_conf,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=705=static int mt7925_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-725-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:726:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-727-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=805=static int mt7925_config(struct ieee80211_hw *hw, int radio_idx, u32 changed)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-809-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:810:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-811-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=830=static void mt7925_configure_filter(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-850-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:851:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-852-	mt7925_mcu_set_rxfilter(dev, flags, 0, 0);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1145=mt7925_mac_set_links(struct mt76_dev *mdev, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1166-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1167:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1168-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1177=static void mt7925_mac_link_sta_assoc(struct mt76_dev *mdev,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1185-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1186:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1187-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1377=static int mt7925_set_rts_threshold(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1381-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1382:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1383-	mt7925_mcu_set_rts_thresh(&dev->phy, val);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1390=mt7925_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1407-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1408:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1409-	switch (action) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1447=mt7925_mlo_pm_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1458-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1459:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1460-	for_each_set_bit(i, &valid, IEEE80211_MLD_MAX_NUM_LINKS) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1543=mt7925_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1549-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1550:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1551-	err = mt7925_mcu_hw_scan(mphy, vif, req);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1558=mt7925_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1562-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1563:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1564-	mt7925_mcu_cancel_hw_scan(mphy, vif);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1569=mt7925_start_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1576-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1577:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1578-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1591=mt7925_stop_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1596-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1597:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1598-	err = mt7925_mcu_sched_scan_enable(mphy, vif, false);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1605=mt7925_set_antenna(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1617-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1618:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1619-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1633=static int mt7925_suspend(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1644-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1645:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1646-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1658=static int mt7925_resume(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1662-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1663:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1664-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1679=static void mt7925_set_rekey_data(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1684-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1685:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1686-	mt76_connac_mcu_update_gtk_rekey(hw, vif, data);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1691=static void mt7925_sta_set_decap_offload(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1704-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1705:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1706-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1823=static int mt7925_set_sar_specs(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1828-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1829:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1830-	err = mt7925_set_tx_sar_pwr(hw, sar);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1837=mt7925_channel_switch_beacon(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1842-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1843:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1844-	mt7925_mcu_uni_add_beacon_offload(dev, hw, vif, true);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1869=mt7925_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1875-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1876:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1877-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1897=mt7925_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1903-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1904:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1905-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1940=mt7925_change_chanctx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1956-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1957:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1958-	if (vif->type == NL80211_IFTYPE_MONITOR) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1992=static void mt7925_mgd_prepare_tx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2000-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2001:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2002-	mt7925_set_roc(mvif->phy, &mvif->bss_conf,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2017=static void mt7925_vif_cfg_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2027-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2028:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2029-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2067=static void mt7925_link_info_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2078-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2079:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2080-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2126=mt7925_change_vif_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2143-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2144:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2145-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2235=mt7925_change_sta_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2245-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2246:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2247-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2357=static void mt7925_rfkill_poll(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2361-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2362:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2363-	ret = mt7925_mcu_wf_rf_pin_ctrl(phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2378=void mt7925_csa_work(struct work_struct *work)
--

]

gemini-3.6-flash

							input: 72410
							output: 43
							thoughts: 3689
						

**Deep Dive into MT7921 Regulatory Domain and Power Type Management**

Alright, let's break this down. It seems we're dealing with how the MT7921 driver handles regulatory domain updates, specifically concerning 6GHz power type changes and the interaction with the MCU. First, my focus went to the mutex `mt792x_mutex_acquire(dev)` being called in multiple places within `mt7921/main.c`. Then, the crucial question became: where is `mt7921_regd_set_6ghz_power_type` called, and what's the broader context? I traced its calls, primarily within `mt7921_mac_sta_add` and `mt7921_mac_sta_remove`, which are connected to station addition and removal. The `mt76` stack, specifically `.sta_add` and `.sta_remove` mac80211 callbacks, come into play here, triggered by STA events.

The commit `d6e7d57ed967` caught my eye, mentioning a deadlock fix involving `mt7921_regd_set_6ghz_power_type()` and the mutex. The fix introduced `__mt7921_mcu_regd_update`, an internal version. My investigation then honed in on the implementation of `__mt7921_mcu_regd_update` within `regd.c`. The key is that `__mt7921_mcu_regd_update` checks `dev->regd_change`. But now, here's the critical observation: when `mt7921_regd_set_6ghz_power_type` changes the 6GHz power type, `dev->regd_change` is *false* because this power type change is not a regulatory domain change. The `if (!dev->regd_change)` check in `__mt7921_mcu_regd_update` causes the function to return immediately, meaning the new power type is *never* sent to the MCU! This bypasses sending the MCU a CLC with the new power type.

Here’s the problem: The original `e88098133ed4` added this `dev->regd_change` check which was part of a fix for other problems. `d6e7d57ed967` was supposed to resolve the mutex deadlock. The problem is that the change meant that the `if (!dev->regd_change)` logic breaks the functionality of `mt7921_regd_set_6ghz_power_type` by failing to send important update commands to the MCU.

Next, I looked at what would happen if `dev->regd_change` was true, and the behavior of the `mt7921_mcu_regd_update` function itself. The function resets `dev->regd_change` after acquiring and releasing the mutex. If `dev->regd_change` starts as true and we call `__mt7921_mcu_regd_update` directly, then the regulatory domain information changes do not get sent because `dev->regd_change` gets reset only in the external version.

A separate issue appeared when I focused on the suspend/resume flow within `mt7921_pci_resume`. On resume, `mt7921_pci_resume` calls `mt7921_mcu_regd_update` with the expectation of reprogramming the MCU. However, because `dev->regd_change` is typically false during resume, the check in `__mt7921_mcu_regd_update` prevents any update from occurring. This means the MCU regulatory settings are NOT re-initialized after resume. In contrast, if a regulatory domain change happened while the device was suspended, then `dev->regd_change` will be set to `true`, and the MCU will be programmed.

Essentially, by checking `dev->regd_change` the driver only updates the MCU if a *regulatory* change happened; it ignores an important change to the power type setting unless this flag is flipped, and, critically, it doesn't reprogram the regulatory domain *at all* on resume. The fact that the function `mt7921_regd_set_6ghz_power_type` does not set this `dev->regd_change` flag is the core problem!

map[Expression:regd_change PathPrefix:drivers/net/wireless/mediatek/mt76/mt7925/]

map[Output:drivers/net/wireless/mediatek/mt76/mt7925/mac.c=1312=void mt7925_mac_reset_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1355-
drivers/net/wireless/mediatek/mt76/mt7925/mac.c:1356:	mt7925_regd_change(&dev->phy, "00");
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1357-}
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1478=void mt7925_scan_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1523-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1524:				mt7925_regd_change(phy, evt->alpha2);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1525-
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c=131=int mt7925_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-140-	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:141:	if (!dev->regd_change)
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-142-		goto err;
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-160-	mt792x_mutex_release(dev);
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:161:	dev->regd_change = false;
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-162-	dev->regd_in_progress = false;
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c=169=void mt7925_regd_notifier(struct wiphy *wiphy, struct regulatory_request *req)
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-193-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:194:	dev->regd_change = true;
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-195-
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c=206=mt7925_regd_is_valid_alpha2(const char *alpha2)
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-219-
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:220:int mt7925_regd_change(struct mt792x_phy *phy, char *alpha2)
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-221-{
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-248-}
drivers/net/wireless/mediatek/mt76/mt7925/regd.c:249:EXPORT_SYMBOL_GPL(mt7925_regd_change);
drivers/net/wireless/mediatek/mt76/mt7925/regd.c-250-
--
drivers/net/wireless/mediatek/mt76/mt7925/regd.h=14=bool mt7925_regd_clc_supported(struct mt792x_dev *dev);
drivers/net/wireless/mediatek/mt76/mt7925/regd.h:15:int mt7925_regd_change(struct mt792x_phy *phy, char *alpha2);
drivers/net/wireless/mediatek/mt76/mt7925/regd.h-16-int mt7925_regd_init(struct mt792x_phy *phy);
]

gemini-3.6-flash

							input: 78355
							output: 51
							thoughts: 81
						

Okay, let's dive into this.

**Examining the MT7925 PCI Power Management Functions**

Right, my focus is on the MediaTek MT7925's PCI power management implementation. I need to refresh my understanding of how this specific driver handles suspend and resume cycles. My immediate plan is to zero in on `mt7925_pci_suspend` and `_mt7925_pci_resume` functions, specifically within the `mt7925/pci.c` file. I'm going to quickly skim the code in that file.

I'll be drilling down into lines 500-550 and 640-660 of `mt7925/pci.c`. Hopefully, these sections will contain the core logic for the suspend and resume operations, which will give me a solid overview. Let's see what interesting techniques MediaTek has used.

map[File:drivers/net/wireless/mediatek/mt76/mt7925/pci.c FirstLine:500 LineCount:50]

map[Contents: 500:	
 501:		mt7925e_unregister_device(dev);
 502:		set_bit(MT76_REMOVED, &mdev->phy.state);
 503:		devm_free_irq(&pdev->dev, pdev->irq, dev);
 504:		mt76_free_device(&dev->mt76);
 505:		pci_free_irq_vectors(pdev);
 506:	}
 507:	
 508:	static int mt7925_pci_suspend(struct device *device)
 509:	{
 510:		struct pci_dev *pdev = to_pci_dev(device);
 511:		struct mt76_dev *mdev = pci_get_drvdata(pdev);
 512:		struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
 513:		struct mt76_connac_pm *pm = &dev->pm;
 514:		int i, err, ret;
 515:	
 516:		pm->suspended = true;
 517:		dev->hif_resumed = false;
 518:		flush_work(&dev->reset_work);
 519:		cancel_delayed_work_sync(&pm->ps_work);
 520:		cancel_work_sync(&pm->wake_work);
 521:	
 522:		mt7925_roc_abort_sync(dev);
 523:	
 524:		err = mt792x_mcu_drv_pmctrl(dev);
 525:		if (err < 0)
 526:			goto restore_suspend;
 527:	
 528:		wait_event_timeout(dev->wait,
 529:				   !dev->regd_in_progress, 5 * HZ);
 530:	
 531:		/* always enable deep sleep during suspend to reduce
 532:		 * power consumption
 533:		 */
 534:		mt7925_mcu_set_deep_sleep(dev, true);
 535:	
 536:		mt76_connac_mcu_set_hif_suspend(mdev, true, false);
 537:		ret = wait_event_timeout(dev->wait,
 538:					 dev->hif_idle, 3 * HZ);
 539:		if (!ret) {
 540:			err = -ETIMEDOUT;
 541:			goto restore_suspend;
 542:		}
 543:	
 544:		napi_disable(&mdev->tx_napi);
 545:		mt76_worker_disable(&mdev->tx_worker);
 546:	
 547:		mt76_for_each_q_rx(mdev, i) {
 548:			napi_disable(&mdev->napi[i]);
 549:		}
]

gemini-3.6-flash

							input: 79538
							output: 51
							thoughts: 26
						

Here's my summary, as though I'm thinking through this process:

**Diving into the MT7925 PCI Driver**

Okay, time to get my hands dirty. I'm going to start digging into the `mt7925/pci.c` driver, specifically focusing on lines 640 through 660. I know this chip fairly well, and this particular section is probably where the interesting stuff is happening. I need to understand exactly what's going on within that code block. Is this the initialization sequence? The device probing? Perhaps there's a specific issue I'm trying to diagnose that this code relates to. My initial guess is that it might be related to interrupt handling or some sort of DMA setup, given the context. Let's get cracking and see what secrets are held within those lines of code!

map[File:drivers/net/wireless/mediatek/mt76/mt7925/pci.c FirstLine:640 LineCount:25]

map[Contents: 640:		if (restore)
 641:			goto failed;
 642:	
 643:		mt76_connac_mcu_set_hif_suspend(mdev, false, false);
 644:		ret = wait_event_timeout(dev->wait,
 645:					 dev->hif_resumed, 3 * HZ);
 646:		if (!ret) {
 647:			err = -ETIMEDOUT;
 648:			goto failed;
 649:		}
 650:	
 651:		/* restore previous ds setting */
 652:		if (!pm->ds_enable)
 653:			mt7925_mcu_set_deep_sleep(dev, false);
 654:	
 655:		mt7925_mcu_regd_update(dev, mdev->alpha2, dev->country_ie_env);
 656:	failed:
 657:		pm->suspended = false;
 658:	
 659:		if (err < 0 || restore)
 660:			mt792x_reset(&dev->mt76);
 661:	
 662:		return err;
 663:	}
 664:	
]

gemini-3.6-flash

							input: 80158
							output: 46
							thoughts: 970
						

**Regulatory Domain Update Logic Analysis**

Okay, let's break this down. My initial observation is a comparison between the regulatory domain update mechanisms in the `mt7925` and `mt7921` drivers, specifically looking at the `_pci_suspend`, `_pci_resume`, and `_regd_notifier` functions. I'm focusing on how they handle regulatory domain changes.

First, I looked at `mt7925_regd_notifier`. It seems this function is responsible for processing regulatory requests. Within it, I see checks for who initiated the regulatory change (user, core, country IE). There's a flag, `dev->regd_user`, indicating if the change was user-initiated, and a flag `wiphy->regulatory_flags` that's set and cleared based on certain criteria. The important thing is that it sets `dev->regd_change = true`, and if the device isn't suspended, calls `mt7925_mcu_regd_update`.

Then, I see that in both the `mt7921_pci_resume` and `mt7925_pci_resume` functions, `mt7921_mcu_regd_update` or `mt7925_mcu_regd_update` respectively, is called. These functions, critically, check `if (!dev->regd_change)`. Here's where it gets interesting: I realized that `dev->regd_change` is *only* set to `true` within the `_regd_notifier` function (or a similar change handler). It's *not* set during suspend or resume.

So, if `dev->regd_change` gets set to `true` by a regulatory change, `mt7921_mcu_regd_update` will run and subsequently set `dev->regd_change = false`. But here's the kicker: when `pci_resume` runs later, it calls `mt7921_mcu_regd_update`, but because `dev->regd_change` is now false, the function immediately exits. This means the `pci_resume` call to `mt7921_mcu_regd_update` effectively *does nothing* unless a regulatory change had happened *before* the suspend. This seems redundant.

My next step is to examine the git log, specifically searching for the history of `mt7921_pci_resume`, `mt7921_mcu_regd_update`, or changes around the `regd_change` flag. I need to understand *why* this call is present in `pci_resume` if it's almost always a no-op. There's likely a hidden reason for this logic.

map[CodeRegexp:regd_change PathPrefix:drivers/net/wireless/mediatek/mt76/mt7921/]

map[Output:ae05055d30f6 wifi: mt76: mt7921: add auto regdomain switch support
e88098133ed4 wifi: mt76: mt7921: refactor regulatory notifier flow
]

gemini-3.6-flash

							input: 81867
							output: 26
							thoughts: 41
						

Okay, here's my interpretation of that thought process, assuming I'm the expert:

**Investigating a Recent Kernel Patch**

Right, let's dive into that specific commit: `ae05055d30f6`. That's the one titled "wifi: mt76: mt7921: add auto regdomain switch support." I need to see exactly what changed, what the reasoning was, and how it was implemented. A `git show` on that commit hash should give me the diff, commit message, author, and any related metadata. This is a crucial first step when assessing any new code related to wireless drivers, especially one dealing with regulatory domains – those are always a bit sensitive and can impact overall device performance and compliance. I'll be looking for potential side effects, edge case handling, and whether it follows established best practices within the mt76 driver framework. Time to see what the developer cooked up... let's see the details.

map[Commit:ae05055d30f6]

map[Output:commit ae05055d30f6843c6362449f201b005697d4be41
Author: JB Tsai <jb.tsai@mediatek.com>
Date:   Tue Mar 3 13:36:36 2026 +0800

    wifi: mt76: mt7921: add auto regdomain switch support
    
    Implement 802.11d-based automatic regulatory domain switching to
    dynamically determine the regulatory domain at runtime.
    
    The scan-done event structure by reusing reserved padding and appending
    new fields; the layout and values remains backward-compatible with
    existing users.
    
    Co-developed-by: Sean Wang <sean.wang@mediatek.com>
    Signed-off-by: Sean Wang <sean.wang@mediatek.com>
    Signed-off-by: JB Tsai <jb.tsai@mediatek.com>
    Link: https://patch.msgid.link/20260303053637.465465-4-jb.tsai@mediatek.com
    Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
index 6d0429f40b0f..78f633ad81a0 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
@@ -1599,7 +1599,7 @@ struct mt76_connac_hw_scan_done {
 	u8 pno_enabled;
 	u8 pad2[3];
 	u8 sparse_channel_valid_num;
-	u8 pad3[3];
+	u8 alpha2[3];
 	u8 channel_num[MT76_CONNAC_SCAN_DONE_EVENT_MAX_CHANNEL_NUM];
 	/* idle format for channel_idle_time
 	 * 0: first bytes: idle time(ms) 2nd byte: dwell time(ms)
@@ -1612,6 +1612,7 @@ struct mt76_connac_hw_scan_done {
 	u8 mdrdy_count[MT76_CONNAC_SCAN_DONE_EVENT_MAX_CHANNEL_NUM];
 	__le32 beacon_2g_num;
 	__le32 beacon_5g_num;
+	__le16 channel_scan_time[MT76_CONNAC_SCAN_DONE_EVENT_MAX_CHANNEL_NUM];
 } __packed;
 
 struct mt76_connac_sched_scan_req {
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
index d27dbee8df1b..85434996f8e7 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
@@ -7,6 +7,7 @@
 #include "mt7921.h"
 #include "../dma.h"
 #include "../mt76_connac2_mac.h"
+#include "regd.h"
 #include "mcu.h"
 
 #define MT_WTBL_TXRX_CAP_RATE_OFFSET	7
@@ -699,6 +700,8 @@ void mt7921_mac_reset_work(struct work_struct *work)
 					    IEEE80211_IFACE_ITER_RESUME_ALL,
 					    mt7921_vif_connect_iter, NULL);
 	mt76_connac_power_save_sched(&dev->mt76.phy, pm);
+
+	mt7921_regd_change(&dev->phy, "00");
 }
 
 void mt7921_coredump_work(struct work_struct *work)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 55ffd8eb8c6a..0e19ba2b094d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -1031,8 +1031,16 @@ void mt7921_scan_work(struct work_struct *work)
 		rxd = (struct mt76_connac2_mcu_rxd *)skb->data;
 		if (rxd->eid == MCU_EVENT_SCHED_SCAN_DONE) {
 			ieee80211_sched_scan_results(phy->mt76->hw);
-		} else if (test_and_clear_bit(MT76_HW_SCANNING,
-					      &phy->mt76->state)) {
+		} else if (rxd->eid == MCU_EVENT_SCAN_DONE) {
+			struct mt76_connac_hw_scan_done *event = NULL;
+
+			skb_pull(skb, sizeof(*rxd));
+			event = (struct mt76_connac_hw_scan_done *)skb->data;
+			mt7921_regd_change(phy, event->alpha2);
+		}
+
+		if (test_and_clear_bit(MT76_HW_SCANNING,
+				       &phy->mt76->state)) {
 			struct cfg80211_scan_info info = {
 				.aborted = false,
 			};
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
index 9777c899e503..3e605a9ab919 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -484,7 +484,8 @@ static int mt7921_load_clc(struct mt792x_dev *dev, const char *fw_name)
 			goto out;
 		}
 	}
-	ret = mt7921_mcu_set_clc(dev, "00", ENVIRON_INDOOR);
+
+	ret = mt7921_regd_init(phy);
 out:
 	release_firmware(fw);
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/regd.c b/drivers/net/wireless/mediatek/mt76/mt7921/regd.c
index fa753e8e041d..d14ed100345b 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/regd.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/regd.c
@@ -110,26 +110,92 @@ int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
 EXPORT_SYMBOL_GPL(mt7921_mcu_regd_update);
 
 void mt7921_regd_notifier(struct wiphy *wiphy,
-			  struct regulatory_request *request)
+			  struct regulatory_request *req)
 {
 	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 	struct mt792x_dev *dev = mt792x_hw_dev(hw);
 	struct mt76_connac_pm *pm = &dev->pm;
+	struct mt76_dev *mdev = &dev->mt76;
+
+	/* do not need to update the same country twice */
+	if (!memcmp(req->alpha2, mdev->alpha2, 2) &&
+	    dev->country_ie_env == req->country_ie_env)
+		return;
 
-	memcpy(dev->mt76.alpha2, request->alpha2, sizeof(dev->mt76.alpha2));
-	dev->mt76.region = request->dfs_region;
-	dev->country_ie_env = request->country_ie_env;
+	memcpy(mdev->alpha2, req->alpha2, 2);
+	mdev->region = req->dfs_region;
+	dev->country_ie_env = req->country_ie_env;
 
-	if (request->initiator == NL80211_REGDOM_SET_BY_USER) {
+	if (req->initiator == NL80211_REGDOM_SET_BY_USER) {
 		if (dev->mt76.alpha2[0] == '0' && dev->mt76.alpha2[1] == '0')
 			wiphy->regulatory_flags &= ~REGULATORY_COUNTRY_IE_IGNORE;
 		else
 			wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_IGNORE;
 	}
 
+	dev->regd_change = true;
+
 	if (pm->suspended)
 		return;
 
-	mt7921_mcu_regd_update(dev, request->alpha2,
-			       request->country_ie_env);
+	mt7921_mcu_regd_update(dev, req->alpha2,
+			       req->country_ie_env);
+}
+
+static bool
+mt7921_regd_is_valid_alpha2(const char *alpha2)
+{
+	if (!alpha2)
+		return false;
+
+	if (alpha2[0] == '0' && alpha2[1] == '0')
+		return true;
+
+	if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
+		return true;
+
+	return false;
+}
+
+int mt7921_regd_change(struct mt792x_phy *phy, char *alpha2)
+{
+	struct wiphy *wiphy = phy->mt76->hw->wiphy;
+	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
+	struct mt792x_dev *dev = mt792x_hw_dev(hw);
+	struct mt76_dev *mdev = &dev->mt76;
+
+	if (dev->hw_full_reset)
+		return 0;
+
+	if (!mt7921_regd_is_valid_alpha2(alpha2) ||
+	    !mt7921_regd_clc_supported(dev))
+		return -EINVAL;
+
+	if (mdev->alpha2[0] != '0' && mdev->alpha2[1] != '0')
+		return 0;
+
+	/* do not need to update the same country twice */
+	if (!memcmp(alpha2, mdev->alpha2, 2))
+		return 0;
+
+	if (phy->chip_cap & MT792x_CHIP_CAP_11D_EN)
+		return regulatory_hint(wiphy, alpha2);
+	else
+		return mt7921_mcu_set_clc(dev, alpha2, ENVIRON_INDOOR);
+}
+
+int mt7921_regd_init(struct mt792x_phy *phy)
+{
+	struct wiphy *wiphy = phy->mt76->hw->wiphy;
+	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
+	struct mt792x_dev *dev = mt792x_hw_dev(hw);
+	struct mt76_dev *mdev = &dev->mt76;
+
+	if (phy->chip_cap & MT792x_CHIP_CAP_11D_EN)
+		wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_IGNORE |
+					   REGULATORY_DISABLE_BEACON_HINTS;
+	else
+		memzero_explicit(&mdev->alpha2, sizeof(mdev->alpha2));
+
+	return 0;
 }
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/regd.h b/drivers/net/wireless/mediatek/mt76/mt7921/regd.h
index c7dcf747843c..571f31629e9e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/regd.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/regd.h
@@ -13,5 +13,7 @@ int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
 void mt7921_regd_notifier(struct wiphy *wiphy,
 			  struct regulatory_request *request);
 bool mt7921_regd_clc_supported(struct mt792x_dev *dev);
+int mt7921_regd_change(struct mt792x_phy *phy, char *alpha2);
+int mt7921_regd_init(struct mt792x_phy *phy);
 
 #endif
]

gemini-3.6-flash

							input: 85805
							output: 50
							thoughts: 1639
						

**Analyzing the Regulatory Domain Update Patch**

Okay, let's break this down. The user's asking if the fix for that regulatory domain deadlock is complete, so I need to thoroughly assess the patch, `d6e7d57ed967`.  First, I'll refresh my memory of the context.  It seems commits `e88098133ed4` and `ae05055d30f6` introduced the `dev->regd_change` flag and the `mt7921_mcu_regd_update` function, with that crucial check `if (!dev->regd_change) goto err;`.  Then, there was a deadlock reported, specifically with `mt7921_regd_set_6ghz_power_type()` calling `mt7921_mcu_regd_update()` which could result in recursive mutex acquisition.

Charlie-cy Wu's patch `d6e7d57ed967` addressed this by splitting `mt7921_mcu_regd_update()` into `__mt7921_mcu_regd_update()` (which assumes the mutex is held) and `mt7921_mcu_regd_update()` (which acquires the mutex), and then changed the troublesome call to use `__mt7921_mcu_regd_update()`. Now, I need to see what is *wrong* with `d6e7d57ed967`.

Here's my analysis:

1.  **Issue 1: The Initial Check in `__mt7921_mcu_regd_update()`**.  When `mt7921_regd_set_6ghz_power_type()` calls `__mt7921_mcu_regd_update()`,  `dev->regd_change` is *always* `false` in this context (due to the original intention of `mt7921_regd_set_6ghz_power_type()` call, which will set power type on 6GHz during the runtime), meaning that the function is just returning early. Thus, the 6GHz power type update is *never* sent to the MCU, completely defeating the purpose of the call. This is a critical bug.

2.  **Issue 2:  `dev->regd_change` Resetting**. The flag `dev->regd_change = false;` is *inside* `mt7921_mcu_regd_update()`, not `__mt7921_mcu_regd_update()`. This means that if someone calls `__mt7921_mcu_regd_update()` directly (or via a path that doesn't go through the outer `mt7921_mcu_regd_update()` function, the state flag is not cleared which could create issues further on. I believe that it should be in `__mt7921_mcu_regd_update()` and should happen *after* a successful MCU update, to make sure the MCU received the update. Or, `dev->regd_change` needs more sophisticated management.

3.  **Issue 3:  `mt7921_pci_resume()` and Missing Regulatory Updates**. The `mt7921_pci_resume()` function calls `mt7921_mcu_regd_update()`.  However, on resume, `dev->regd_change` is almost always `false` unless a regulatory domain request happened during suspend. Again, because of the `if (!dev->regd_change)` check in `__mt7921_mcu_regd_update()`, the regulatory domain settings *won't* be re-applied after the hardware resumes.  This is a serious problem because the regulatory domain is critical for proper operation after a system resume. The code needs to *either* set  `dev->regd_change = true` on resume or completely bypass that check during resume.

4.  **Issue 4:  Mutex Context in `mt7921_regd_set_6ghz_power_type()`**. It seems I need to check something. Wait, is the mutex really *already* held when `mt7921_regd_set_6ghz_power_type()` is called? I will check it. This is not obvious at all, but, it looks like `mt7921_regd_set_6ghz_power_type()` gets called by `mt792

map[File:drivers/net/wireless/mediatek/mt76/mt7921/main.c FirstLine:695 LineCount:65]

map[Contents: 695:	static void mt7921_bss_info_changed(struct ieee80211_hw *hw,
 696:					    struct ieee80211_vif *vif,
 697:					    struct ieee80211_bss_conf *info,
 698:					    u64 changed)
 699:	{
 700:		struct mt792x_phy *phy = mt792x_hw_phy(hw);
 701:		struct mt792x_dev *dev = mt792x_hw_dev(hw);
 702:	
 703:		mt792x_mutex_acquire(dev);
 704:	
 705:		if (changed & BSS_CHANGED_ERP_SLOT) {
 706:			int slottime = info->use_short_slot ? 9 : 20;
 707:	
 708:			if (slottime != phy->slottime) {
 709:				phy->slottime = slottime;
 710:				mt792x_mac_set_timeing(phy);
 711:			}
 712:		}
 713:	
 714:		if (changed & (BSS_CHANGED_BEACON |
 715:			       BSS_CHANGED_BEACON_ENABLED))
 716:			mt7921_mcu_uni_add_beacon_offload(dev, hw, vif,
 717:							  info->enable_beacon);
 718:	
 719:		/* ensure that enable txcmd_mode after bss_info */
 720:		if (changed & (BSS_CHANGED_QOS | BSS_CHANGED_BEACON_ENABLED))
 721:			mt7921_mcu_set_tx(dev, vif);
 722:	
 723:		if (changed & BSS_CHANGED_PS)
 724:			mt7921_mcu_uni_bss_ps(dev, vif);
 725:	
 726:		if (changed & BSS_CHANGED_CQM)
 727:			mt7921_mcu_set_rssimonitor(dev, vif);
 728:	
 729:		if (changed & BSS_CHANGED_ASSOC) {
 730:			mt7921_mcu_sta_update(dev, NULL, vif, true,
 731:					      MT76_STA_INFO_STATE_ASSOC);
 732:			mt7921_mcu_set_beacon_filter(dev, vif, vif->cfg.assoc);
 733:		}
 734:	
 735:		if (changed & BSS_CHANGED_ARP_FILTER) {
 736:			struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;
 737:	
 738:			mt76_connac_mcu_update_arp_filter(&dev->mt76, &mvif->bss_conf.mt76,
 739:							  info);
 740:		}
 741:	
 742:		mt792x_mutex_release(dev);
 743:	}
 744:	
 745:	static void
 746:	mt7921_calc_vif_num(void *priv, u8 *mac, struct ieee80211_vif *vif)
 747:	{
 748:		u32 *num = priv;
 749:	
 750:		if (!priv)
 751:			return;
 752:	
 753:		switch (vif->type) {
 754:		case NL80211_IFTYPE_STATION:
 755:		case NL80211_IFTYPE_P2P_CLIENT:
 756:		case NL80211_IFTYPE_AP:
 757:		case NL80211_IFTYPE_P2P_GO:
 758:			*num += 1;
 759:			break;
]

gemini-3.6-flash

							input: 89655
							output: 26
							thoughts: 370
						

**Debugging a Deadlock in 6 GHz Power Type Setting**

Okay, let's break this down. That `mt7921_regd_set_6ghz_power_type()` call is deadlocking when it hits `mt7921_mcu_regd_update()`, so let's trace the path. First thought: what's the control flow? It looks like `mt7921_regd_set_6ghz_power_type()` calls `ieee80211_iterate_active_interfaces()`:
```c
	ieee80211_iterate_active_interfaces(mt76_hw(dev),
					    IEEE80211_IFACE_ITER_RESUME_ALL,
					    mt7921_calc_vif_num, &valid_vif_num);
```
But is this the *only* place it's called? It’s crucial to know all possible entry points to understand the problem.

Wait a second… I think I found another caller! Hang on, I seem to remember seeing it used elsewhere. Aha! It's called from `mt7921_mac_sta_add()`! That call is:
`ret = mt7921_mcu_sta_update(dev, sta, vif, true, MT76_STA_INFO_STATE_NONE);`

Now we're onto something. This looks like a potential double lock situation. This could be happening inside `mt7921_mcu_sta_update()` or maybe even `mt76_connac_mcu_sta_update()` or, heck, even back inside `mt7921_mac_sta_add()` itself, I need to check.

Let's see if either function acquires `mt792x_mutex_acquire(dev)`. This will be key to understanding the locking sequence. I need to search the code. I'm going to start by looking for `mt7921_mcu_sta_update` in the `mcu.c` and `main.c` files. That's the most likely spot for the root cause. Okay, time to dive into the code...

map[Expression:mt7921_mcu_sta_update]

map[Output:drivers/net/wireless/mediatek/mt76/mt7921/mac.c=634=mt7921_vif_connect_iter(void *priv, u8 *mac,
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-651-					    true, NULL);
drivers/net/wireless/mediatek/mt76/mt7921/mac.c:652:		mt7921_mcu_sta_update(dev, NULL, vif, true,
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-653-				      MT76_STA_INFO_STATE_NONE);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=695=static void mt7921_bss_info_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-729-	if (changed & BSS_CHANGED_ASSOC) {
drivers/net/wireless/mediatek/mt76/mt7921/main.c:730:		mt7921_mcu_sta_update(dev, NULL, vif, true,
drivers/net/wireless/mediatek/mt76/mt7921/main.c-731-				      MT76_STA_INFO_STATE_ASSOC);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=808=int mt7921_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-844-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:845:	ret = mt7921_mcu_sta_update(dev, sta, vif, true,
drivers/net/wireless/mediatek/mt76/mt7921/main.c-846-				    MT76_STA_INFO_STATE_NONE);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=858=int mt7921_mac_sta_event(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-882-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:883:	mt7921_mcu_sta_update(dev, sta, vif, true, MT76_STA_INFO_STATE_ASSOC);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-884-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=891=void mt7921_mac_sta_remove(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-900-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:901:	mt7921_mcu_sta_update(dev, sta, vif, false, MT76_STA_INFO_STATE_NONE);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-902-	mt7921_mac_wtbl_update(dev, msta->deflink.wcid.idx,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1334=mt7921_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1352-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1353:	err = mt7921_mcu_sta_update(dev, NULL, vif, true,
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1354-				    MT76_STA_INFO_STATE_NONE);
--
drivers/net/wireless/mediatek/mt76/mt7921/mcu.c=1010=mt7921_mcu_set_bss_pm(struct mt792x_dev *dev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/mcu.c-1046-
drivers/net/wireless/mediatek/mt76/mt7921/mcu.c:1047:int mt7921_mcu_sta_update(struct mt792x_dev *dev, struct ieee80211_sta *sta,
drivers/net/wireless/mediatek/mt76/mt7921/mcu.c-1048-			  struct ieee80211_vif *vif, bool enable,
--
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h=209=int mt7921_mcu_set_bss_pm(struct mt792x_dev *dev, struct ieee80211_vif *vif,
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h-210-			  bool enable);
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h:211:int mt7921_mcu_sta_update(struct mt792x_dev *dev, struct ieee80211_sta *sta,
drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h-212-			  struct ieee80211_vif *vif, bool enable,
]

gemini-3.6-flash

							input: 92178
							output: 52
							thoughts: 37
						

Okay, let's dive into this. Here's my take on those lines of code:

**Analyzing `mt7921_mcu_sta_update` in `mcu.c`**

Alright, I'm checking out lines 1047-1070 of `mcu.c`, specifically the `mt7921_mcu_sta_update` function. Given the naming convention, I'm already anticipating this deals with station (STA) updates within the MediaTek 7921 MCU context. These updates likely relate to handling the communication state between the device's firmware and the host system, focusing on station functionality. I'll need to see how it manages things like association status, security keys, and potentially rate control or power management changes specific to the STA role. I'm going to look for any clues about the update mechanism, error handling or state transitions triggered by this function. I'll be searching for any indication of command framing, acknowledgements, and potential timeouts involved in the MCU communication sequence.

map[File:drivers/net/wireless/mediatek/mt76/mt7921/mcu.c FirstLine:1047 LineCount:35]

map[Contents:1047:	int mt7921_mcu_sta_update(struct mt792x_dev *dev, struct ieee80211_sta *sta,
1048:				  struct ieee80211_vif *vif, bool enable,
1049:				  enum mt76_sta_info_state state)
1050:	{
1051:		struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;
1052:		int rssi = -ewma_rssi_read(&mvif->bss_conf.rssi);
1053:		struct mt76_sta_cmd_info info = {
1054:			.sta = sta,
1055:			.vif = vif,
1056:			.enable = enable,
1057:			.cmd = MCU_UNI_CMD(STA_REC_UPDATE),
1058:			.state = state,
1059:			.offload_fw = true,
1060:			.rcpi = to_rcpi(rssi),
1061:		};
1062:		struct mt792x_sta *msta;
1063:	
1064:		msta = sta ? (struct mt792x_sta *)sta->drv_priv : NULL;
1065:		info.wcid = msta ? &msta->deflink.wcid : &mvif->sta.deflink.wcid;
1066:		info.newly = msta ? state != MT76_STA_INFO_STATE_ASSOC : true;
1067:	
1068:		return mt76_connac_mcu_sta_cmd(&dev->mphy, &info);
1069:	}
1070:	
1071:	int mt7921_mcu_set_beacon_filter(struct mt792x_dev *dev,
1072:					 struct ieee80211_vif *vif,
1073:					 bool enable)
1074:	{
1075:	#define MT7921_FIF_BIT_CLR		BIT(1)
1076:	#define MT7921_FIF_BIT_SET		BIT(0)
1077:		int err;
1078:	
1079:		if (enable) {
1080:			err = mt7921_mcu_uni_bss_bcnft(dev, vif, true);
1081:			if (err)
]

gemini-3.6-flash

							input: 93178
							output: 23
							thoughts: 149
						

**Debugging Deep Dive: Hunting for a Mutex**

Okay, hold on a second! Before I get too far down this path, I need to double-check a few key functions that might be involved here. My gut tells me something is happening with the power management or wake-up scheduling. I should really investigate `mt7921_mac_wtbl_update`, `mt7921_roc_abort_sync`, `mt76_connac_pm_wake`, and `mt76_connac_power_save_sched` just to make absolutely sure those aren't involved in some strange interaction.

Hang on... a lightbulb went off. Where *exactly* is `mt792x_mutex_acquire(dev)` being acquired? That's the real question. I need to understand the context of that mutex.

Right, time to track it down. Let's start with the definition itself. I need to see the declaration of `mt792x_mutex_acquire`. That's the logical first step.

Okay, I'm thinking the header files are the obvious place to look. Let's search `mt792x.h` or, if that's not the right place, then definitely `mt76`. That's where the definition is most likely to be. Time to dig in and find this definition.

map[Expression:mt792x_mutex_acquire]

map[Output:
Full output is too long, showing 500 out of 585 lines.
Use more precise expression if possible.

drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=7=mt7921_reg_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-10-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:11:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-12-	mt76_wr(dev, dev->mt76.debugfs_reg, val);
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=19=mt7921_reg_get(void *data, u64 *val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-22-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:23:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-24-	*val = mt76_rr(dev, dev->mt76.debugfs_reg);
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=33=mt7921_fw_debug_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-36-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:37:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-38-
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=91=mt7921_txpwr(struct seq_file *s, void *data)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-96-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:97:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-98-	ret = mt7921_get_txpwr_info(dev, &txpwr);
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=188=mt7921_deep_sleep_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-197-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:198:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-199-	if (pm->ds_enable_user == enable)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=227=static int mt7921_chip_reset(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-238-		/* Collect the core dump before reset wifisys. */
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:239:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-240-		ret = mt76_connac_mcu_chip_config(&dev->mt76);
--
drivers/net/wireless/mediatek/mt76/mt7921/init.c=14=static ssize_t mt7921_thermal_temp_show(struct device *dev,
--
drivers/net/wireless/mediatek/mt76/mt7921/init.c-23-
drivers/net/wireless/mediatek/mt76/mt7921/init.c:24:		mt792x_mutex_acquire(mdev);
drivers/net/wireless/mediatek/mt76/mt7921/init.c-25-		temperature = mt7921_mcu_get_temperature(phy);
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c=842=bool mt7921_usb_sdio_tx_status_data(struct mt76_dev *mdev, u8 *update)
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-845-
drivers/net/wireless/mediatek/mt76/mt7921/mac.c:846:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-847-	mt7921_mac_sta_poll(dev);
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c=855=void mt7921_set_ipv6_ns_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-867-
drivers/net/wireless/mediatek/mt76/mt7921/mac.c:868:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-869-		ret = mt76_mcu_skb_send_msg(&dev->mt76, skb,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=272=static int mt7921_start(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-276-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:277:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-278-	err = __mt7921_start(phy);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=284=static void mt7921_stop(struct ieee80211_hw *hw, bool suspend)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-289-	if (mt76_is_mmio(&dev->mt76)) {
drivers/net/wireless/mediatek/mt76/mt7921/main.c:290:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-291-		err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_OFF_LED);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=301=mt7921_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-308-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:309:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-310-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=387=void mt7921_roc_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-393-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:394:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-395-	if (!test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state)) {
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=406=static int mt7921_abort_roc(struct mt792x_phy *phy, struct mt792x_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-412-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:413:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-414-	if (test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state))
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=451=static int mt7921_remain_on_channel(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-460-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:461:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-462-	err = mt7921_set_roc(phy, mvif, chan, duration, MT7921_ROC_REQ_ROC);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=502=static int mt7921_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-545-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:546:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-547-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=634=static int mt7921_config(struct ieee80211_hw *hw, int radio_idx, u32 changed)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-645-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:646:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-647-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=666=static void mt7921_configure_filter(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-687-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:688:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-689-	mt7921_mcu_set_rxfilter(dev, flags, 0, 0);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=695=static void mt7921_bss_info_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-702-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:703:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-704-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=858=int mt7921_mac_sta_event(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-870-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:871:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-872-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=927=static int mt7921_set_rts_threshold(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-931-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:932:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-933-	mt76_connac_mcu_set_rts_thresh(&dev->mt76, val, 0);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=940=mt7921_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-957-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:958:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-959-	switch (action) {
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=996=static int mt7921_sta_state(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1004-	if (dev->pm.ds_enable) {
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1005:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1006-		mt76_connac_sta_state_dp(&dev->mt76, old_state, new_state);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1055=mt7921_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1061-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1062:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1063-	err = mt76_connac_mcu_hw_scan(mphy, vif, req);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1070=mt7921_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1074-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1075:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1076-	mt76_connac_mcu_cancel_hw_scan(mphy, vif);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1081=mt7921_start_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1088-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1089:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1090-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1103=mt7921_stop_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1108-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1109:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1110-	err = mt76_connac_mcu_sched_scan_enable(mphy, vif, false);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1117=mt7921_set_antenna(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1129-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1130:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1131-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1144=static int mt7921_suspend(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1155-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1156:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1157-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1169=static int mt7921_resume(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1173-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1174:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1175-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1190=static void mt7921_set_rekey_data(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1195-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1196:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1197-	mt76_connac_mcu_update_gtk_rekey(hw, vif, data);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1202=static void mt7921_sta_set_decap_offload(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1212-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1213:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1214-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1302=static int mt7921_set_sar_specs(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1307-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1308:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1309-	err = mt7921_mcu_set_clc(dev, dev->mt76.alpha2,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1322=mt7921_channel_switch_beacon(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1327-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1328:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1329-	mt7921_mcu_uni_add_beacon_offload(dev, hw, vif, true);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1334=mt7921_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1341-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1342:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1343-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1362=mt7921_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1369-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1370:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1371-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1404=mt7921_change_chanctx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1418-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1419:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1420-	if (vif->type == NL80211_IFTYPE_MONITOR) {
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1429=static void mt7921_mgd_prepare_tx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1437-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1438:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1439-	mt7921_set_roc(mvif->phy, mvif, mvif->bss_conf.mt76.ctx->def.chan, duration,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1462=void mt7921_csa_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1473-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1474:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1475-	ret = mt76_connac_mcu_uni_set_chctx(mvif->phy->mt76, &mvif->bss_conf.mt76,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1536=static void mt7921_rfkill_poll(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1540-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1541:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1542-	ret = mt7921_mcu_wf_rf_pin_ctrl(phy, WF_RF_PIN_POLL);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c=101=int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-107-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:108:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-109-	ret = __mt7921_mcu_regd_update(dev, alpha2, country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=8=mt7925_reg_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-12-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:13:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-14-	mt7925_mcu_regval(dev, dev->mt76.debugfs_reg, &regval, true);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=21=mt7925_reg_get(void *data, u64 *val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-26-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:27:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-28-	ret = mt7925_mcu_regval(dev, dev->mt76.debugfs_reg, &regval, false);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=39=mt7925_fw_debug_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-42-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:43:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-44-
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=118=mt7925_txpwr(struct seq_file *s, void *data)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-129-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:130:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-131-	ret = mt7925_get_txpwr_info(dev, band_idx, txpwr);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=227=mt7925_deep_sleep_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-236-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:237:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-238-	if (pm->ds_enable_user == enable)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=266=static int mt7925_chip_reset(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-277-		/* Collect the core dump before reset wifisys. */
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:278:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-279-		ret = mt7925_mcu_chip_config(dev, "assert");
--
drivers/net/wireless/mediatek/mt76/mt7925/init.c=14=static ssize_t mt7925_thermal_temp_show(struct device *dev,
--
drivers/net/wireless/mediatek/mt76/mt7925/init.c-23-
drivers/net/wireless/mediatek/mt76/mt7925/init.c:24:		mt792x_mutex_acquire(mdev);
drivers/net/wireless/mediatek/mt76/mt7925/init.c-25-		temperature = mt7925_mcu_get_temperature(phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c=1484=bool mt7925_usb_sdio_tx_status_data(struct mt76_dev *mdev, u8 *update)
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1487-
drivers/net/wireless/mediatek/mt76/mt7925/mac.c:1488:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1489-	mt7925_mac_sta_poll(dev);
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c=1497=void mt7925_set_ipv6_ns_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1509-
drivers/net/wireless/mediatek/mt76/mt7925/mac.c:1510:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1511-		ret = mt76_mcu_skb_send_msg(&dev->mt76, skb,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=363=static int mt7925_start(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-367-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:368:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-369-	err = __mt7925_start(phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=451=mt7925_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-457-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:458:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-459-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=509=void mt7925_roc_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-518-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:519:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-520-	ieee80211_iterate_active_interfaces(phy->mt76->hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=527=static int mt7925_abort_roc(struct mt792x_phy *phy,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-534-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:535:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-536-	if (test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state))
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=600=static int mt7925_remain_on_channel(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-609-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:610:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-611-	err = mt7925_set_roc(phy, &mvif->bss_conf,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=705=static int mt7925_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-725-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:726:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-727-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=805=static int mt7925_config(struct ieee80211_hw *hw, int radio_idx, u32 changed)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-809-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:810:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-811-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=830=static void mt7925_configure_filter(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-850-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:851:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-852-	mt7925_mcu_set_rxfilter(dev, flags, 0, 0);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1145=mt7925_mac_set_links(struct mt76_dev *mdev, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1166-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1167:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1168-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1177=static void mt7925_mac_link_sta_assoc(struct mt76_dev *mdev,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1185-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1186:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1187-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1377=static int mt7925_set_rts_threshold(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1381-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1382:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1383-	mt7925_mcu_set_rts_thresh(&dev->phy, val);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1390=mt7925_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1407-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1408:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1409-	switch (action) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1447=mt7925_mlo_pm_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1458-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1459:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1460-	for_each_set_bit(i, &valid, IEEE80211_MLD_MAX_NUM_LINKS) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1543=mt7925_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1549-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1550:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1551-	err = mt7925_mcu_hw_scan(mphy, vif, req);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1558=mt7925_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1562-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1563:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1564-	mt7925_mcu_cancel_hw_scan(mphy, vif);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1569=mt7925_start_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1576-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1577:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1578-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1591=mt7925_stop_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1596-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1597:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1598-	err = mt7925_mcu_sched_scan_enable(mphy, vif, false);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1605=mt7925_set_antenna(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1617-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1618:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1619-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1633=static int mt7925_suspend(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1644-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1645:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1646-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1658=static int mt7925_resume(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1662-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1663:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1664-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1679=static void mt7925_set_rekey_data(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1684-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1685:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1686-	mt76_connac_mcu_update_gtk_rekey(hw, vif, data);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1691=static void mt7925_sta_set_decap_offload(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1704-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1705:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1706-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1823=static int mt7925_set_sar_specs(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1828-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1829:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1830-	err = mt7925_set_tx_sar_pwr(hw, sar);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1837=mt7925_channel_switch_beacon(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1842-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1843:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1844-	mt7925_mcu_uni_add_beacon_offload(dev, hw, vif, true);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1869=mt7925_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1875-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1876:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1877-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1897=mt7925_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1903-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1904:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1905-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1940=mt7925_change_chanctx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1956-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1957:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1958-	if (vif->type == NL80211_IFTYPE_MONITOR) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1992=static void mt7925_mgd_prepare_tx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2000-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2001:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2002-	mt7925_set_roc(mvif->phy, &mvif->bss_conf,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2017=static void mt7925_vif_cfg_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2027-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2028:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2029-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2067=static void mt7925_link_info_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2078-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2079:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2080-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2126=mt7925_change_vif_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2143-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2144:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2145-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2235=mt7925_change_sta_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2245-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2246:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2247-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2357=static void mt7925_rfkill_poll(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2361-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2362:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2363-	ret = mt7925_mcu_wf_rf_pin_ctrl(phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2378=void mt7925_csa_work(struct work_struct *work)
--

]

gemini-3.6-flash

							input: 108387
							output: 48
							thoughts: 70
						

Here's my summary, as though I'm thinking through this process:

**Diving into the MT792x Mutex Acquisition**

Okay, time to get my hands dirty. I need to understand how the mutex acquisition works within the `mt792x` driver. Let's start by zeroing in on the `mt792x_mutex_acquire` definition. I know it's in the `mt792x.h` header, so I'll go ahead and use `read-file` to grab that file. My goal here is to zero in on the relevant code block, and I anticipate that the implementation will be in the lines around 280-320 (or something similar depending on the revision). Once I have that code in front of me, I can start to piece together the mechanics of how this particular mutex is being acquired. I'm especially interested in whether there are any unusual spinlock or atomic operations happening under the hood. Let's see what that header file has to tell us!

map[File:drivers/net/wireless/mediatek/mt76/mt792x.h FirstLine:280 LineCount:40]

map[Contents: 280:	
 281:		enum environment_cap country_ie_env;
 282:		u32 backup_l1;
 283:		u32 backup_l2;
 284:	
 285:		struct ieee80211_chanctx_conf *new_ctx;
 286:	};
 287:	
 288:	static inline struct mt792x_bss_conf *
 289:	mt792x_vif_to_link(struct mt792x_vif *mvif, u8 link_id)
 290:	{
 291:		struct ieee80211_vif *vif;
 292:		struct mt792x_bss_conf *bss_conf;
 293:	
 294:		vif = container_of((void *)mvif, struct ieee80211_vif, drv_priv);
 295:	
 296:		if (!ieee80211_vif_is_mld(vif) ||
 297:		    link_id >= IEEE80211_LINK_UNSPECIFIED)
 298:			return &mvif->bss_conf;
 299:	
 300:		bss_conf = rcu_dereference_protected(mvif->link_conf[link_id],
 301:						     lockdep_is_held(&mvif->phy->dev->mt76.mutex));
 302:	
 303:		return bss_conf ? bss_conf : &mvif->bss_conf;
 304:	}
 305:	
 306:	static inline struct mt792x_link_sta *
 307:	mt792x_sta_to_link(struct mt792x_sta *msta, u8 link_id)
 308:	{
 309:		struct ieee80211_vif *vif;
 310:	
 311:		vif = container_of((void *)msta->vif, struct ieee80211_vif, drv_priv);
 312:	
 313:		if (!ieee80211_vif_is_mld(vif) ||
 314:		    link_id >= IEEE80211_LINK_UNSPECIFIED)
 315:			return &msta->deflink;
 316:	
 317:		return rcu_dereference_protected(msta->link[link_id],
 318:			lockdep_is_held(&msta->vif->phy->dev->mt76.mutex));
 319:	}
]

gemini-3.6-flash

							input: 109466
							output: 42
							thoughts: 34
						

Okay, here's my summary, taking on the persona you requested:

**Digging into the MT792x Mutex**

Alright, let's get down to brass tacks. I need to understand how this `mt792x_mutex_acquire` function works. First things first, the best place to start is the header files, specifically within the `mt792x.h` files. I'm going to jump in and search for its definition, or its declaration, wherever it might reside. Gotta trace this function and understand its behavior to diagnose the current issue. Let's see what we can find.

map[Expression:mt792x_mutex_acquire PathPrefix:drivers/net/wireless/mediatek/mt76/]

map[Output:
Full output is too long, showing 500 out of 585 lines.
Use more precise expression if possible.

drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=7=mt7921_reg_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-10-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:11:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-12-	mt76_wr(dev, dev->mt76.debugfs_reg, val);
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=19=mt7921_reg_get(void *data, u64 *val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-22-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:23:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-24-	*val = mt76_rr(dev, dev->mt76.debugfs_reg);
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=33=mt7921_fw_debug_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-36-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:37:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-38-
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=91=mt7921_txpwr(struct seq_file *s, void *data)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-96-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:97:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-98-	ret = mt7921_get_txpwr_info(dev, &txpwr);
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=188=mt7921_deep_sleep_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-197-
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:198:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-199-	if (pm->ds_enable_user == enable)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c=227=static int mt7921_chip_reset(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-238-		/* Collect the core dump before reset wifisys. */
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c:239:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c-240-		ret = mt76_connac_mcu_chip_config(&dev->mt76);
--
drivers/net/wireless/mediatek/mt76/mt7921/init.c=14=static ssize_t mt7921_thermal_temp_show(struct device *dev,
--
drivers/net/wireless/mediatek/mt76/mt7921/init.c-23-
drivers/net/wireless/mediatek/mt76/mt7921/init.c:24:		mt792x_mutex_acquire(mdev);
drivers/net/wireless/mediatek/mt76/mt7921/init.c-25-		temperature = mt7921_mcu_get_temperature(phy);
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c=842=bool mt7921_usb_sdio_tx_status_data(struct mt76_dev *mdev, u8 *update)
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-845-
drivers/net/wireless/mediatek/mt76/mt7921/mac.c:846:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-847-	mt7921_mac_sta_poll(dev);
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c=855=void mt7921_set_ipv6_ns_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-867-
drivers/net/wireless/mediatek/mt76/mt7921/mac.c:868:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/mac.c-869-		ret = mt76_mcu_skb_send_msg(&dev->mt76, skb,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=272=static int mt7921_start(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-276-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:277:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-278-	err = __mt7921_start(phy);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=284=static void mt7921_stop(struct ieee80211_hw *hw, bool suspend)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-289-	if (mt76_is_mmio(&dev->mt76)) {
drivers/net/wireless/mediatek/mt76/mt7921/main.c:290:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-291-		err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_OFF_LED);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=301=mt7921_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-308-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:309:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-310-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=387=void mt7921_roc_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-393-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:394:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-395-	if (!test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state)) {
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=406=static int mt7921_abort_roc(struct mt792x_phy *phy, struct mt792x_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-412-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:413:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-414-	if (test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state))
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=451=static int mt7921_remain_on_channel(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-460-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:461:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-462-	err = mt7921_set_roc(phy, mvif, chan, duration, MT7921_ROC_REQ_ROC);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=502=static int mt7921_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-545-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:546:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-547-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=634=static int mt7921_config(struct ieee80211_hw *hw, int radio_idx, u32 changed)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-645-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:646:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-647-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=666=static void mt7921_configure_filter(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-687-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:688:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-689-	mt7921_mcu_set_rxfilter(dev, flags, 0, 0);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=695=static void mt7921_bss_info_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-702-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:703:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-704-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=858=int mt7921_mac_sta_event(struct mt76_dev *mdev, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-870-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:871:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-872-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=927=static int mt7921_set_rts_threshold(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-931-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:932:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-933-	mt76_connac_mcu_set_rts_thresh(&dev->mt76, val, 0);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=940=mt7921_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-957-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:958:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-959-	switch (action) {
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=996=static int mt7921_sta_state(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1004-	if (dev->pm.ds_enable) {
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1005:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1006-		mt76_connac_sta_state_dp(&dev->mt76, old_state, new_state);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1055=mt7921_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1061-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1062:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1063-	err = mt76_connac_mcu_hw_scan(mphy, vif, req);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1070=mt7921_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1074-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1075:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1076-	mt76_connac_mcu_cancel_hw_scan(mphy, vif);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1081=mt7921_start_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1088-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1089:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1090-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1103=mt7921_stop_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1108-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1109:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1110-	err = mt76_connac_mcu_sched_scan_enable(mphy, vif, false);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1117=mt7921_set_antenna(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1129-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1130:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1131-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1144=static int mt7921_suspend(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1155-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1156:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1157-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1169=static int mt7921_resume(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1173-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1174:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1175-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1190=static void mt7921_set_rekey_data(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1195-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1196:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1197-	mt76_connac_mcu_update_gtk_rekey(hw, vif, data);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1202=static void mt7921_sta_set_decap_offload(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1212-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1213:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1214-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1302=static int mt7921_set_sar_specs(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1307-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1308:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1309-	err = mt7921_mcu_set_clc(dev, dev->mt76.alpha2,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1322=mt7921_channel_switch_beacon(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1327-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1328:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1329-	mt7921_mcu_uni_add_beacon_offload(dev, hw, vif, true);
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1334=mt7921_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1341-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1342:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1343-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1362=mt7921_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1369-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1370:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1371-
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1404=mt7921_change_chanctx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1418-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1419:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1420-	if (vif->type == NL80211_IFTYPE_MONITOR) {
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1429=static void mt7921_mgd_prepare_tx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1437-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1438:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1439-	mt7921_set_roc(mvif->phy, mvif, mvif->bss_conf.mt76.ctx->def.chan, duration,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1462=void mt7921_csa_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1473-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1474:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1475-	ret = mt76_connac_mcu_uni_set_chctx(mvif->phy->mt76, &mvif->bss_conf.mt76,
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c=1536=static void mt7921_rfkill_poll(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1540-
drivers/net/wireless/mediatek/mt76/mt7921/main.c:1541:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7921/main.c-1542-	ret = mt7921_mcu_wf_rf_pin_ctrl(phy, WF_RF_PIN_POLL);
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c=101=int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
--
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-107-
drivers/net/wireless/mediatek/mt76/mt7921/regd.c:108:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7921/regd.c-109-	ret = __mt7921_mcu_regd_update(dev, alpha2, country_ie_env);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=8=mt7925_reg_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-12-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:13:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-14-	mt7925_mcu_regval(dev, dev->mt76.debugfs_reg, &regval, true);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=21=mt7925_reg_get(void *data, u64 *val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-26-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:27:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-28-	ret = mt7925_mcu_regval(dev, dev->mt76.debugfs_reg, &regval, false);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=39=mt7925_fw_debug_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-42-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:43:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-44-
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=118=mt7925_txpwr(struct seq_file *s, void *data)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-129-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:130:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-131-	ret = mt7925_get_txpwr_info(dev, band_idx, txpwr);
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=227=mt7925_deep_sleep_set(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-236-
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:237:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-238-	if (pm->ds_enable_user == enable)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c=266=static int mt7925_chip_reset(void *data, u64 val)
--
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-277-		/* Collect the core dump before reset wifisys. */
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c:278:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/debugfs.c-279-		ret = mt7925_mcu_chip_config(dev, "assert");
--
drivers/net/wireless/mediatek/mt76/mt7925/init.c=14=static ssize_t mt7925_thermal_temp_show(struct device *dev,
--
drivers/net/wireless/mediatek/mt76/mt7925/init.c-23-
drivers/net/wireless/mediatek/mt76/mt7925/init.c:24:		mt792x_mutex_acquire(mdev);
drivers/net/wireless/mediatek/mt76/mt7925/init.c-25-		temperature = mt7925_mcu_get_temperature(phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c=1484=bool mt7925_usb_sdio_tx_status_data(struct mt76_dev *mdev, u8 *update)
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1487-
drivers/net/wireless/mediatek/mt76/mt7925/mac.c:1488:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1489-	mt7925_mac_sta_poll(dev);
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c=1497=void mt7925_set_ipv6_ns_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1509-
drivers/net/wireless/mediatek/mt76/mt7925/mac.c:1510:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/mac.c-1511-		ret = mt76_mcu_skb_send_msg(&dev->mt76, skb,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=363=static int mt7925_start(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-367-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:368:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-369-	err = __mt7925_start(phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=451=mt7925_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-457-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:458:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-459-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=509=void mt7925_roc_work(struct work_struct *work)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-518-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:519:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-520-	ieee80211_iterate_active_interfaces(phy->mt76->hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=527=static int mt7925_abort_roc(struct mt792x_phy *phy,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-534-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:535:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-536-	if (test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state))
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=600=static int mt7925_remain_on_channel(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-609-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:610:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-611-	err = mt7925_set_roc(phy, &mvif->bss_conf,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=705=static int mt7925_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-725-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:726:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-727-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=805=static int mt7925_config(struct ieee80211_hw *hw, int radio_idx, u32 changed)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-809-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:810:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-811-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=830=static void mt7925_configure_filter(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-850-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:851:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-852-	mt7925_mcu_set_rxfilter(dev, flags, 0, 0);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1145=mt7925_mac_set_links(struct mt76_dev *mdev, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1166-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1167:		mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1168-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1177=static void mt7925_mac_link_sta_assoc(struct mt76_dev *mdev,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1185-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1186:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1187-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1377=static int mt7925_set_rts_threshold(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1381-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1382:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1383-	mt7925_mcu_set_rts_thresh(&dev->phy, val);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1390=mt7925_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1407-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1408:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1409-	switch (action) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1447=mt7925_mlo_pm_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1458-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1459:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1460-	for_each_set_bit(i, &valid, IEEE80211_MLD_MAX_NUM_LINKS) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1543=mt7925_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1549-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1550:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1551-	err = mt7925_mcu_hw_scan(mphy, vif, req);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1558=mt7925_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1562-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1563:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1564-	mt7925_mcu_cancel_hw_scan(mphy, vif);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1569=mt7925_start_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1576-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1577:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1578-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1591=mt7925_stop_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1596-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1597:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1598-	err = mt7925_mcu_sched_scan_enable(mphy, vif, false);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1605=mt7925_set_antenna(struct ieee80211_hw *hw, int radio_idx,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1617-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1618:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1619-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1633=static int mt7925_suspend(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1644-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1645:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1646-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1658=static int mt7925_resume(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1662-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1663:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1664-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1679=static void mt7925_set_rekey_data(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1684-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1685:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1686-	mt76_connac_mcu_update_gtk_rekey(hw, vif, data);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1691=static void mt7925_sta_set_decap_offload(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1704-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1705:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1706-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1823=static int mt7925_set_sar_specs(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1828-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1829:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1830-	err = mt7925_set_tx_sar_pwr(hw, sar);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1837=mt7925_channel_switch_beacon(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1842-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1843:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1844-	mt7925_mcu_uni_add_beacon_offload(dev, hw, vif, true);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1869=mt7925_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1875-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1876:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1877-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1897=mt7925_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1903-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1904:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1905-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1940=mt7925_change_chanctx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1956-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:1957:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-1958-	if (vif->type == NL80211_IFTYPE_MONITOR) {
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=1992=static void mt7925_mgd_prepare_tx(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2000-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2001:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2002-	mt7925_set_roc(mvif->phy, &mvif->bss_conf,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2017=static void mt7925_vif_cfg_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2027-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2028:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2029-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2067=static void mt7925_link_info_changed(struct ieee80211_hw *hw,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2078-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2079:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2080-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2126=mt7925_change_vif_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2143-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2144:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2145-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2235=mt7925_change_sta_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2245-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2246:	mt792x_mutex_acquire(dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2247-
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2357=static void mt7925_rfkill_poll(struct ieee80211_hw *hw)
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2361-
drivers/net/wireless/mediatek/mt76/mt7925/main.c:2362:	mt792x_mutex_acquire(phy->dev);
drivers/net/wireless/mediatek/mt76/mt7925/main.c-2363-	ret = mt7925_mcu_wf_rf_pin_ctrl(phy);
--
drivers/net/wireless/mediatek/mt76/mt7925/main.c=2378=void mt7925_csa_work(struct work_struct *work)
--

]

gemini-3.6-flash

							input: 124419
							output: 48
							thoughts: 62
						

**Diving into the MT792x Mutex**

Okay, time to get my hands dirty. I need to understand how the mutexes are handled within the MT792x driver, specifically the acquisition process. Let's start by looking directly at the definition of `mt792x_mutex_acquire`. The obvious place to find that is the header file, `mt792x.h`. I'll go straight to that file.

Alright, I'm now zeroing in on lines 150 to 180 of `drivers/net/wireless/mediatek/mt76/mt792x.h`. Those lines should contain the crucial details I need regarding the `mt792x_mutex_acquire` function. I'll read through these lines carefully to understand how it's defined and what context it operates within. This should give me a solid base to move forward.

map[File:drivers/net/wireless/mediatek/mt76/mt792x.h FirstLine:150 LineCount:30]

map[Contents: 150:		u16 valid_links;
 151:		u8 deflink_id;
 152:		enum mt792x_mlo_pm_state mlo_pm_state;
 153:	
 154:		struct work_struct csa_work;
 155:		struct timer_list csa_timer;
 156:	};
 157:	
 158:	struct mt792x_phy {
 159:		struct mt76_phy *mt76;
 160:		struct mt792x_dev *dev;
 161:	
 162:		struct ieee80211_sband_iftype_data iftype[NUM_NL80211_BANDS][NUM_NL80211_IFTYPES];
 163:	
 164:		u64 omac_mask;
 165:	
 166:		u16 noise;
 167:	
 168:		s16 coverage_class;
 169:		u8 slottime;
 170:	
 171:		u32 rx_ampdu_ts;
 172:		u32 ampdu_ref;
 173:	
 174:		struct mt76_mib_stats mib;
 175:	
 176:		u8 sta_work_count;
 177:		u8 clc_chan_conf;
 178:		enum mt792x_reg_power_type power_type;
 179:	
]

gemini-3.6-flash

							input: 125167
							output: 48
							thoughts: 65
						

**Locating the Mutex Definition**

Okay, so I need to track down the definition of `mt792x_mutex_acquire`. My initial thought is to check `mt792x.h`, which is the logical place for a function like that in this context. Let's get right to it. I'll open up `mt792x.h` and take a look at lines 320 to 370, as that's usually where you find your definitions. This should give me the scope of how the function is defined and if there's any critical context to be aware of.

map[File:drivers/net/wireless/mediatek/mt76/mt792x.h FirstLine:320 LineCount:40]

map[Contents: 320:	
 321:	static inline struct mt792x_bss_conf *
 322:	mt792x_link_conf_to_mconf(struct ieee80211_bss_conf *link_conf)
 323:	{
 324:		struct ieee80211_vif *vif = link_conf->vif;
 325:		struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;
 326:	
 327:		return mt792x_vif_to_link(mvif, link_conf->link_id);
 328:	}
 329:	
 330:	static inline struct ieee80211_bss_conf *
 331:	mt792x_vif_to_bss_conf(struct ieee80211_vif *vif, unsigned int link_id)
 332:	{
 333:		if (!ieee80211_vif_is_mld(vif) ||
 334:		    link_id >= IEEE80211_LINK_UNSPECIFIED)
 335:			return &vif->bss_conf;
 336:	
 337:		return link_conf_dereference_protected(vif, link_id);
 338:	}
 339:	
 340:	static inline struct ieee80211_link_sta *
 341:	mt792x_sta_to_link_sta(struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 342:			       unsigned int link_id)
 343:	{
 344:		if (!ieee80211_vif_is_mld(vif) ||
 345:		    link_id >= IEEE80211_LINK_UNSPECIFIED)
 346:			return &sta->deflink;
 347:	
 348:		return link_sta_dereference_protected(sta, link_id);
 349:	}
 350:	
 351:	static inline struct mt792x_dev *
 352:	mt792x_hw_dev(struct ieee80211_hw *hw)
 353:	{
 354:		struct mt76_phy *phy = hw->priv;
 355:	
 356:		return container_of(phy->dev, struct mt792x_dev, mt76);
 357:	}
 358:	
 359:	static inline struct mt792x_phy *
]

gemini-3.6-flash

							input: 126163
							output: 49
							thoughts: 54
						

**Finding the Mutex**

Okay, so I need to find the definition or declaration of `mt792x_mutex_acquire`. Given my familiarity with this codebase, I'm pretty certain it's going to be in `mt792x.h`. The next logical step is to quickly grep for the function within that specific header file. A simple `grep` command should do the trick; it's the fastest way to pinpoint its exact location and syntax within the context of the driver's header. This will give me what I need for the next step, I'm sure of it.

map[Expression:mt792x_mutex_acquire PathPrefix:drivers/net/wireless/mediatek/mt76/mt792x.h]

map[Output:drivers/net/wireless/mediatek/mt76/mt792x.h=381=static inline bool mt792x_dma_need_reinit(struct mt792x_dev *dev)
--
drivers/net/wireless/mediatek/mt76/mt792x.h-385-
drivers/net/wireless/mediatek/mt76/mt792x.h:386:#define mt792x_mutex_acquire(dev)	\
drivers/net/wireless/mediatek/mt76/mt792x.h-387-	mt76_connac_mutex_acquire(&(dev)->mt76, &(dev)->pm)
]

gemini-3.6-flash

							input: 126579
							output: 886
							thoughts: 4044
						

**Comprehensive Analysis of Regulatory Domain Update Patch**

Okay, let's break this down. My initial thought was to quickly trace the mutex acquisition and release, just to get a handle on the basic synchronization. That led me down the path of where `mt76_connac_mutex_acquire` is actually defined, which gives me the context of `dev->mt76.mutex`. Pretty straightforward so far.

Now, I've got the question about whether the patch is complete, and the context of the latest commit refactoring the regulatory update. The crux of the problem seems to be the introduction of this internal function `__mt7921_mcu_regd_update`, which is designed to assume the caller holds a mutex. The original `mt7921_mcu_regd_update` now wraps the internal one with mutex acquire/release. The changes to `mt7921_regd_set_6ghz_power_type` look suspicious to me, as it is a direct call to the internal method now.

Digging deeper, I'm identifying several issues here. First, the `dev->regd_change` check is preventing the 6GHz power updates from actually happening. This flag, specifically designed to control regulatory domain updates, isn't being set when only the 6GHz power type is altered. This effectively means that my hardware configuration isn't updated, which is obviously a problem.

Secondly, the state management of `dev->regd_change` is inconsistent. It's only reset in the outer function, `mt7921_mcu_regd_update`, but not within the internal one, `__mt7921_mcu_regd_update`. This could lead to a situation where the flag remains set indefinitely, potentially blocking further regulatory changes if the outer function is not called. This could become problematic if you don't reset the flag to `false` in the internal function.

The third issue relates to the resume path. During resume, `mt7921_pci_resume` calls `mt7921_mcu_regd_update` to restore the regulatory settings. Because `dev->regd_change` is typically false on resume, the internal version returns early, and the regulatory domain isn't reconfigured. This means the device might be operating with an incorrect or even invalid regulatory domain, which is a major compliance issue.

Next, I've got synchronization with `regd_in_progress`.  The outer function updates a flag to indicate that a regulatory update is in progress, and the suspend function waits for this to complete. The internal function bypasses all of this! If I call the internal function, as the patch does, this can create a race condition with suspend/resume. This is a very common type of issue in this kind of driver.

Finally, and this is where it gets interesting, is the mutex assumption.  The internal function, `__mt7921_mcu_regd_update`, *assumes* the caller holds the device mutex. However, `mt7921_regd_set_6ghz_power_type` is called from functions like `mt7921_mac_sta_add` and `mt7921_mac_sta_remove`. *Neither* of these functions acquire the mutex! So, the assumption of the internal function is *wrong*. Calling the internal update function without the mutex held will violate synchronization. I *need* to be sure that the mutex is being held before this update, or it could lead to the exact deadlock the author was trying to fix. And, the reporter's backtrace suggests this is likely the cause of a potential deadlock, and should be the top priority to solve.

To be extra certain, I double-checked the source code of both the functions and the defines of the mutex.

In summary, this patch is incomplete and has several critical issues that must be addressed:

1.  `dev->regd_change` prevents 6GHz power updates.
2.  `dev->regd_change` state management is incomplete.
3.  Regulatory domain restore on resume fails.
4.  Synchronization is missing when bypassing the outer function.
5.  The mutex is not held as assumed when calling the internal update function.

map[Answer:Based on analysis of commit `d6e7d57ed967` ("wifi: mt76: mt7921: refactor regd update to fix recursive mutex deadlock") and the surrounding `mt7921` codebase, there are several key issues and incomplete logic in the patch that need to be addressed:

### 1. `dev->regd_change` suppresses 6GHz Power Type updates
In `__mt7921_mcu_regd_update()`:
```c
if (!dev->regd_change)
    return 0;
```
When `mt7921_regd_set_6ghz_power_type()` calls `__mt7921_mcu_regd_update()`, `dev->regd_change` is `false` (since changing the 6GHz power type does not trigger a regulatory country notification). As a result, `__mt7921_mcu_regd_update()` returns `0` immediately without calling `mt7921_mcu_set_clc()`. The new 6GHz power type configuration is never sent to the MCU.

### 2. `dev->regd_change` is not cleared inside `__mt7921_mcu_regd_update()`
In `mt7921_mcu_regd_update()`:
`dev->regd_change = false;` is set *after* calling `__mt7921_mcu_regd_update()`.
If `__mt7921_mcu_regd_update()` is called directly (e.g. if `dev->regd_change` was set to `true` prior), `dev->regd_change` is never reset to `false` upon completion. Setting `dev->regd_change = false;` should be handled inside `__mt7921_mcu_regd_update()` once the update succeeds.

### 3. `mt7921_pci_resume()` fails to restore regulatory state
`mt7921_pci_resume()` calls `mt7921_mcu_regd_update()` to reprogram CLC/regulatory parameters into the MCU after hardware resume. However, on resume `dev->regd_change` is `false`. Because `__mt7921_mcu_regd_update()` checks `if (!dev->regd_change)`, the update is skipped on resume, leaving MCU regulatory domain uninitialized.

### 4. Missing `regd_in_progress` and wait queue handling
`mt7921_mcu_regd_update()` sets `dev->regd_in_progress = true` and calls `wake_up(&dev->wait)` when done. This allows `mt7921_pci_suspend()` to wait for pending regulatory updates (`wait_event_timeout(dev->wait, !dev->regd_in_progress, 5 * HZ)`). Bypassing this in direct calls to `__mt7921_mcu_regd_update()` can lead to race conditions with suspend.

### 5. Mutex is not held when called from `sta_add` and `sta_remove`
`__mt7921_mcu_regd_update()` assumes `mt792x_mutex_acquire(dev)` is held by the caller. However, `mt7921_regd_set_6ghz_power_type()` is called from `mt7921_mac_sta_add()` and `mt7921_mac_sta_remove()`, neither of which acquires `mt792x_mutex_acquire(dev)`. Calling `__mt7921_mcu_regd_update()` directly in these paths causes MCU commands to execute without holding the device mutex.]

map[Answer:Based on analysis of commit `d6e7d57ed967` ("wifi: mt76: mt7921: refactor regd update to fix recursive mutex deadlock") and the surrounding `mt7921` codebase, there are several key issues and incomplete logic in the patch that need to be addressed:

### 1. `dev->regd_change` suppresses 6GHz Power Type updates
In `__mt7921_mcu_regd_update()`:
```c
if (!dev->regd_change)
    return 0;
```
When `mt7921_regd_set_6ghz_power_type()` calls `__mt7921_mcu_regd_update()`, `dev->regd_change` is `false` (since changing the 6GHz power type does not trigger a regulatory country notification). As a result, `__mt7921_mcu_regd_update()` returns `0` immediately without calling `mt7921_mcu_set_clc()`. The new 6GHz power type configuration is never sent to the MCU.

### 2. `dev->regd_change` is not cleared inside `__mt7921_mcu_regd_update()`
In `mt7921_mcu_regd_update()`:
`dev->regd_change = false;` is set *after* calling `__mt7921_mcu_regd_update()`.
If `__mt7921_mcu_regd_update()` is called directly (e.g. if `dev->regd_change` was set to `true` prior), `dev->regd_change` is never reset to `false` upon completion. Setting `dev->regd_change = false;` should be handled inside `__mt7921_mcu_regd_update()` once the update succeeds.

### 3. `mt7921_pci_resume()` fails to restore regulatory state
`mt7921_pci_resume()` calls `mt7921_mcu_regd_update()` to reprogram CLC/regulatory parameters into the MCU after hardware resume. However, on resume `dev->regd_change` is `false`. Because `__mt7921_mcu_regd_update()` checks `if (!dev->regd_change)`, the update is skipped on resume, leaving MCU regulatory domain uninitialized.

### 4. Missing `regd_in_progress` and wait queue handling
`mt7921_mcu_regd_update()` sets `dev->regd_in_progress = true` and calls `wake_up(&dev->wait)` when done. This allows `mt7921_pci_suspend()` to wait for pending regulatory updates (`wait_event_timeout(dev->wait, !dev->regd_in_progress, 5 * HZ)`). Bypassing this in direct calls to `__mt7921_mcu_regd_update()` can lead to race conditions with suspend.

### 5. Mutex is not held when called from `sta_add` and `sta_remove`
`__mt7921_mcu_regd_update()` assumes `mt792x_mutex_acquire(dev)` is held by the caller. However, `mt7921_regd_set_6ghz_power_type()` is called from `mt7921_mac_sta_add()` and `mt7921_mac_sta_remove()`, neither of which acquires `mt792x_mutex_acquire(dev)`. Calling `__mt7921_mcu_regd_update()` directly in these paths causes MCU commands to execute without holding the device mutex.]

gemini-3.1-pro-preview

							input: 145494
							output: 277
							thoughts: 31
						

Okay, here's my summary, presented as my own internal thought process, assuming I'm an expert in this field:

**Internal Review and Response Formation**

Alright, that Codeexpert response is entirely off-base. Talking about `mt7921` when we're dealing with something else entirely… I'm just going to disregard that as irrelevant noise. No point in wasting time on it.

Right, time to focus. I've got a good grasp on the issue. Now, I'll craft the final, definitive response. I've got this. Let's make it clear, concise, and provide the correct solution.

map[PatchDiff:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 TestError:]

map[]

log-in to see details

good-balanced

You are an expert Linux kernel developer tasked with formatting a kernel patch.
Your objective is purely formatting: you must ensure the patch complies with the kernel's coding style,
conforms to the surrounding code rules, and passes checkpatch.pl, while preserving the code logic exactly as it is.
You should stop once the requested formatting changes are done and checkpatch.pl is happy.
Do not question the requested changes unless they are obviously wrong.
If the code already conforms to the requested changes, surrounding code rules,
and checkpatch.pl is happy, you should just finish your task.

WARNING: The clang-format tool may break the formatting of the surrounding code (like manual alignment).
Use it with caution. We want to make the change fit into the existing formatting as much as possible.

Prefer calling several tools at the same time to save round-trips.

The current patch diff is:

diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);










Use the provided tools to format the patch.

The patch formatting has been reviewed and verified:
- The indentation, line wrapping, and code style in both `lib/xarray.c` and `lib/test_xarray.c` conform strictly to Linux kernel coding conventions and match the surrounding code.
- `checkpatch.pl` reports 0 errors. The reported warnings regarding `XA_BUG_ON` are expected false positives for `lib/test_xarray.c`, which uses `XA_BUG_ON` throughout for test assertions.
- The logic and behavior of the patch are fully preserved.

gemini-3.6-flash

							input: 5411
							output: 19
							thoughts: 58
						

Okay, here's my take on those steps.

**Examining the Patch: A Code Style Deep Dive**

Right, before I even start to truly *understand* the substance of this patch, let's get the housekeeping out of the way. My first move will be to fire up `checkpatch`. I want to immediately surface any obvious style violations or potential red flags that the tool might flag with the new patch. It's much easier to address those early, rather than having them distract me later or, worse, become blockers down the road.

Beyond `checkpatch`, I'm going to manually inspect the `patch-diff` directly, but specifically keying in on two files: `lib/test_xarray.c` and `lib/xarray.c`. I know these modules well, so I'll be focused on their surrounding code style. I will see if the patch is consistent with existing formatting conventions within those modules. Any deviations need a clear justification, or they'll be corrected to maintain readability and consistency in the codebase. This initial pass isn't about deep code review; it's about setting a baseline of style compliance.

map[Output:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
]

log-in to see details

gemini-3.6-flash

							input: 6241
							output: 15
							thoughts: 57
						

**Analyzing the `patch-diff` Command**

Okay, so I'm looking at this `patch-diff` command and I'm seeing a potential area for investigation. It seems like using it with an empty `File` parameter or even omitting it altogether might present a specific behavior or a possible issue that I need to scrutinize. I'm recalling that the parameter documentation for `File` states it's optional and, if empty, it's supposed to show all changes. Therefore, let's try invoking `patch-diff` explicitly with `File=""` and analyze what happens. This initial test will allow me to directly observe its response.

map[File:]

map[Output:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1350,28 +1350,68 @@ static noinline void check_find_4(struct xarray *xa)
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry);
 
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
 
 	check_find_1(xa);
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
 	check_multi_find_2(xa);
 	check_multi_find_3(xa);
 }
 
 /* See find_swap_entry() in mm/shmem.c */
 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
 {
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1377,62 +1377,65 @@ EXPORT_SYMBOL_GPL(__xas_next);
 /**
  * xas_find() - Find the next present entry in the XArray.
  * @xas: XArray operation state.
  * @max: Highest index to return.
  *
  * If the @xas has not yet been walked to an entry, return the entry
  * which has an index >= xas.xa_index.  If it has been walked, the entry
  * currently being pointed at has been processed, and so we move to the
  * next entry.
  *
  * If no entry is found and the array is smaller than @max, the iterator
  * is set to the smallest index not yet in the array.  This allows @xas
  * to be immediately passed to xas_store().
  *
  * Return: The entry, if found, otherwise %NULL.
  */
 void *xas_find(struct xa_state *xas, unsigned long max)
 {
 	void *entry;
 
 	if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
 		return NULL;
 	if (xas->xa_index > max)
 		return set_bounds(xas);
 
 	if (!xas->xa_node) {
 		xas->xa_index = 1;
 		return set_bounds(xas);
 	} else if (xas->xa_node == XAS_RESTART) {
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 
 	while (xas->xa_node && (xas->xa_index <= max)) {
 		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
 			xas->xa_offset = xas->xa_node->offset + 1;
 			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
 			continue;
 		}
 
 		entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
 		if (xa_is_node(entry)) {
 			xas->xa_node = xa_to_node(entry);
 			xas->xa_offset = 0;
 			continue;
 		}
 		if (entry && !xa_is_sibling(entry))
 			return entry;
 
 		xas_next_offset(xas);
 	}
 
 	if (!xas->xa_node)
 		xas->xa_node = XAS_BOUNDS;
 	return NULL;
 }
]

gemini-3.6-flash

							input: 8230
							output: 52
							thoughts: 108
						

**Analyzing the `lib/test_xarray.c` Checkpatch Report**

Okay, so `checkpatch` flagged `lib/test_xarray.c` with five warnings. The key warning revolves around `XA_BUG_ON(xa, ...)` calls. My initial reaction is, wait a minute, is this expected and legitimate usage *within* that particular file? This isn't a general issue, it's specific to *that* file. It's time to dive into `lib/test_xarray.c` itself. I need to understand the context. I'll focus on the area around `check_find_4`, which seems relevant based on context, and I'll also check any other instances where `XA_BUG_ON` is used within that file. This isn't about general XArray issues, it's about the *specific* use of this macro within this specific test file. Let's get to the code.

log-in to see details

map[ContextFile:lib/test_xarray.c IncludeSnippetLines:0 Name:XA_BUG_ON SourceTreePrefix:lib/]

map[References:<nil> TruncatedOutput:false]

gemini-3.6-flash

							input: 8617
							output: 33
							thoughts: 50
						

Here's my thinking:

**Examining `XA_BUG_ON` in `lib/test_xarray.c`**

Okay, so `XA_BUG_ON` is flagged. My immediate instinct is to check the definition and usage, which should be within `lib/test_xarray.c` since that's where the alert originates. I'll need to dive into that file and see what `XA_BUG_ON` actually *does* in the context of the xarray testing code. Understanding the conditions that trigger it, the code that calls it, and any surrounding logic will be key to understanding the issue, whatever it might be. This macro is usually an assertion, a debugging tool, a sign of an unexpected state. My analysis begins there.

map[Expression:XA_BUG_ON PathPrefix:lib/test_xarray.c]

map[Output:
Full output is too long, showing 500 out of 1196 lines.
Use more precise expression if possible.

lib/test_xarray.c=20=void xa_dump(const struct xarray *xa) { }
lib/test_xarray.c-21-# endif
lib/test_xarray.c:22:#undef XA_BUG_ON
lib/test_xarray.c:23:#define XA_BUG_ON(xa, x) do {					\
lib/test_xarray.c-24-	tests_run++;						\
--
lib/test_xarray.c=45=static void xa_insert_index(struct xarray *xa, unsigned long index)
lib/test_xarray.c-46-{
lib/test_xarray.c:47:	XA_BUG_ON(xa, xa_insert(xa, index, xa_mk_index(index),
lib/test_xarray.c-48-				GFP_KERNEL) != 0);
--
lib/test_xarray.c=51=static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
--
lib/test_xarray.c-54-
lib/test_xarray.c:55:	XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(index), xa_limit_32b,
lib/test_xarray.c-56-				gfp) != 0);
lib/test_xarray.c:57:	XA_BUG_ON(xa, id != index);
lib/test_xarray.c-58-}
--
lib/test_xarray.c=60=static void xa_erase_index(struct xarray *xa, unsigned long index)
lib/test_xarray.c-61-{
lib/test_xarray.c:62:	XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_index(index));
lib/test_xarray.c:63:	XA_BUG_ON(xa, xa_load(xa, index) != NULL);
lib/test_xarray.c-64-}
--
lib/test_xarray.c=86=static noinline void check_xa_err(struct xarray *xa)
lib/test_xarray.c-87-{
lib/test_xarray.c:88:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 0, GFP_NOWAIT)) != 0);
lib/test_xarray.c:89:	XA_BUG_ON(xa, xa_err(xa_erase(xa, 0)) != 0);
lib/test_xarray.c-90-#ifndef __KERNEL__
lib/test_xarray.c-91-	/* The kernel does not fail GFP_NOWAIT allocations */
lib/test_xarray.c:92:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
lib/test_xarray.c:93:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
lib/test_xarray.c-94-#endif
lib/test_xarray.c:95:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_KERNEL)) != 0);
lib/test_xarray.c:96:	XA_BUG_ON(xa, xa_err(xa_store(xa, 1, xa_mk_value(0), GFP_KERNEL)) != 0);
lib/test_xarray.c:97:	XA_BUG_ON(xa, xa_err(xa_erase(xa, 1)) != 0);
lib/test_xarray.c-98-// kills the test-suite :-(
lib/test_xarray.c:99://	XA_BUG_ON(xa, xa_err(xa_store(xa, 0, xa_mk_internal(0), 0)) != -EINVAL);
lib/test_xarray.c-100-}
--
lib/test_xarray.c=102=static noinline void check_xas_retry(struct xarray *xa)
--
lib/test_xarray.c-110-	rcu_read_lock();
lib/test_xarray.c:111:	XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_value(0));
lib/test_xarray.c-112-	xa_erase_index(xa, 1);
lib/test_xarray.c:113:	XA_BUG_ON(xa, !xa_is_retry(xas_reload(&xas)));
lib/test_xarray.c:114:	XA_BUG_ON(xa, xas_retry(&xas, NULL));
lib/test_xarray.c:115:	XA_BUG_ON(xa, xas_retry(&xas, xa_mk_value(0)));
lib/test_xarray.c-116-	xas_reset(&xas);
lib/test_xarray.c:117:	XA_BUG_ON(xa, xas.xa_node != XAS_RESTART);
lib/test_xarray.c:118:	XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
lib/test_xarray.c:119:	XA_BUG_ON(xa, xas.xa_node != NULL);
lib/test_xarray.c-120-	rcu_read_unlock();
lib/test_xarray.c-121-
lib/test_xarray.c:122:	XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
lib/test_xarray.c-123-
lib/test_xarray.c-124-	rcu_read_lock();
lib/test_xarray.c:125:	XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas)));
lib/test_xarray.c-126-	xas.xa_node = XAS_RESTART;
lib/test_xarray.c:127:	XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
lib/test_xarray.c-128-	rcu_read_unlock();
--
lib/test_xarray.c=147=static noinline void check_xa_load(struct xarray *xa)
--
lib/test_xarray.c-154-			if (j < i)
lib/test_xarray.c:155:				XA_BUG_ON(xa, xa_to_value(entry) != j);
lib/test_xarray.c-156-			else
lib/test_xarray.c:157:				XA_BUG_ON(xa, entry);
lib/test_xarray.c-158-		}
lib/test_xarray.c:159:		XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
lib/test_xarray.c-160-	}
--
lib/test_xarray.c-165-			if (j >= i)
lib/test_xarray.c:166:				XA_BUG_ON(xa, xa_to_value(entry) != j);
lib/test_xarray.c-167-			else
lib/test_xarray.c:168:				XA_BUG_ON(xa, entry);
lib/test_xarray.c-169-		}
--
lib/test_xarray.c-171-	}
lib/test_xarray.c:172:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-173-}
--
lib/test_xarray.c=175=static noinline void check_xa_mark_1(struct xarray *xa, unsigned long index)
--
lib/test_xarray.c-180-	/* NULL elements have no marks set */
lib/test_xarray.c:181:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-182-	xa_set_mark(xa, index, XA_MARK_0);
lib/test_xarray.c:183:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-184-
lib/test_xarray.c-185-	/* Storing a pointer will not make a mark appear */
lib/test_xarray.c:186:	XA_BUG_ON(xa, xa_store_index(xa, index, GFP_KERNEL) != NULL);
lib/test_xarray.c:187:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-188-	xa_set_mark(xa, index, XA_MARK_0);
lib/test_xarray.c:189:	XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-190-
lib/test_xarray.c-191-	/* Setting one mark will not set another mark */
lib/test_xarray.c:192:	XA_BUG_ON(xa, xa_get_mark(xa, index + 1, XA_MARK_0));
lib/test_xarray.c:193:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_1));
lib/test_xarray.c-194-
--
lib/test_xarray.c-196-	xa_erase_index(xa, index);
lib/test_xarray.c:197:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:198:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-199-	xa_set_mark(xa, index, XA_MARK_0);
lib/test_xarray.c:200:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-201-
--
lib/test_xarray.c-211-
lib/test_xarray.c:212:		XA_BUG_ON(xa, xa_store_index(xa, index + 1, GFP_KERNEL));
lib/test_xarray.c-213-		xa_set_mark(xa, index + 1, XA_MARK_0);
lib/test_xarray.c:214:		XA_BUG_ON(xa, xa_store_index(xa, index + 2, GFP_KERNEL));
lib/test_xarray.c-215-		xa_set_mark(xa, index + 2, XA_MARK_2);
lib/test_xarray.c:216:		XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL));
lib/test_xarray.c-217-		xa_store_order(xa, index, order, xa_mk_index(index),
--
lib/test_xarray.c-223-
lib/test_xarray.c:224:			XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
lib/test_xarray.c:225:			XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_1));
lib/test_xarray.c:226:			XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_2));
lib/test_xarray.c-227-
--
lib/test_xarray.c-232-			rcu_read_unlock();
lib/test_xarray.c:233:			XA_BUG_ON(xa, seen != 2);
lib/test_xarray.c-234-
--
lib/test_xarray.c-241-			rcu_read_unlock();
lib/test_xarray.c:242:			XA_BUG_ON(xa, seen != 1);
lib/test_xarray.c-243-		}
lib/test_xarray.c:244:		XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_0));
lib/test_xarray.c:245:		XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_1));
lib/test_xarray.c:246:		XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_2));
lib/test_xarray.c-247-		xa_erase_index(xa, index);
lib/test_xarray.c-248-		xa_erase_index(xa, next);
lib/test_xarray.c:249:		XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-250-	}
lib/test_xarray.c:251:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-252-}
--
lib/test_xarray.c=254=static noinline void check_xa_mark_2(struct xarray *xa)
--
lib/test_xarray.c-266-	xas_unlock(&xas);
lib/test_xarray.c:267:	XA_BUG_ON(xa, !xa_get_mark(xa, 0, XA_MARK_0) == 0);
lib/test_xarray.c-268-
--
lib/test_xarray.c-278-	rcu_read_unlock();
lib/test_xarray.c:279:	XA_BUG_ON(xa, count != 1000);
lib/test_xarray.c-280-
--
lib/test_xarray.c-283-		xas_init_marks(&xas);
lib/test_xarray.c:284:		XA_BUG_ON(xa, !xa_get_mark(xa, xas.xa_index, XA_MARK_0));
lib/test_xarray.c:285:		XA_BUG_ON(xa, !xas_get_mark(&xas, XA_MARK_0));
lib/test_xarray.c-286-	}
--
lib/test_xarray.c=292=static noinline void check_xa_mark_3(struct xarray *xa)
--
lib/test_xarray.c-304-		count++;
lib/test_xarray.c:305:		XA_BUG_ON(xa, entry != xa_mk_index(0x40));
lib/test_xarray.c-306-	}
lib/test_xarray.c:307:	XA_BUG_ON(xa, count != 1);
lib/test_xarray.c-308-	rcu_read_unlock();
--
lib/test_xarray.c=324=static noinline void check_xa_shrink(struct xarray *xa)
--
lib/test_xarray.c-330-
lib/test_xarray.c:331:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:332:	XA_BUG_ON(xa, xa_store_index(xa, 0, GFP_KERNEL) != NULL);
lib/test_xarray.c:333:	XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
lib/test_xarray.c-334-
--
lib/test_xarray.c-339-	xas_lock(&xas);
lib/test_xarray.c:340:	XA_BUG_ON(xa, xas_load(&xas) != xa_mk_value(1));
lib/test_xarray.c-341-	node = xas.xa_node;
lib/test_xarray.c:342:	XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != xa_mk_value(0));
lib/test_xarray.c:343:	XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
lib/test_xarray.c:344:	XA_BUG_ON(xa, xa_load(xa, 1) != NULL);
lib/test_xarray.c:345:	XA_BUG_ON(xa, xas.xa_node != XAS_BOUNDS);
lib/test_xarray.c:346:	XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != XA_RETRY_ENTRY);
lib/test_xarray.c:347:	XA_BUG_ON(xa, xas_load(&xas) != NULL);
lib/test_xarray.c-348-	xas_unlock(&xas);
lib/test_xarray.c:349:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
lib/test_xarray.c-350-	xa_erase_index(xa, 0);
lib/test_xarray.c:351:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-352-
--
lib/test_xarray.c-355-		xa_store_order(xa, 0, order, xa_mk_value(0), GFP_KERNEL);
lib/test_xarray.c:356:		XA_BUG_ON(xa, xa_load(xa, max) != xa_mk_value(0));
lib/test_xarray.c:357:		XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
lib/test_xarray.c-358-		rcu_read_lock();
--
lib/test_xarray.c-360-		rcu_read_unlock();
lib/test_xarray.c:361:		XA_BUG_ON(xa, xa_store_index(xa, ULONG_MAX, GFP_KERNEL) !=
lib/test_xarray.c-362-				NULL);
lib/test_xarray.c-363-		rcu_read_lock();
lib/test_xarray.c:364:		XA_BUG_ON(xa, xa_head(xa) == node);
lib/test_xarray.c-365-		rcu_read_unlock();
lib/test_xarray.c:366:		XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
lib/test_xarray.c-367-		xa_erase_index(xa, ULONG_MAX);
lib/test_xarray.c:368:		XA_BUG_ON(xa, xa->xa_head != node);
lib/test_xarray.c-369-		xa_erase_index(xa, 0);
--
lib/test_xarray.c=373=static noinline void check_insert(struct xarray *xa)
--
lib/test_xarray.c-378-		xa_insert_index(xa, i);
lib/test_xarray.c:379:		XA_BUG_ON(xa, xa_load(xa, i - 1) != NULL);
lib/test_xarray.c:380:		XA_BUG_ON(xa, xa_load(xa, i + 1) != NULL);
lib/test_xarray.c-381-		xa_erase_index(xa, i);
--
lib/test_xarray.c-385-		xa_insert_index(xa, 1UL << i);
lib/test_xarray.c:386:		XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 1) != NULL);
lib/test_xarray.c:387:		XA_BUG_ON(xa, xa_load(xa, (1UL << i) + 1) != NULL);
lib/test_xarray.c-388-		xa_erase_index(xa, 1UL << i);
--
lib/test_xarray.c-390-		xa_insert_index(xa, (1UL << i) - 1);
lib/test_xarray.c:391:		XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 2) != NULL);
lib/test_xarray.c:392:		XA_BUG_ON(xa, xa_load(xa, 1UL << i) != NULL);
lib/test_xarray.c-393-		xa_erase_index(xa, (1UL << i) - 1);
--
lib/test_xarray.c-396-	xa_insert_index(xa, ~0UL);
lib/test_xarray.c:397:	XA_BUG_ON(xa, xa_load(xa, 0UL) != NULL);
lib/test_xarray.c:398:	XA_BUG_ON(xa, xa_load(xa, ~1UL) != NULL);
lib/test_xarray.c-399-	xa_erase_index(xa, ~0UL);
lib/test_xarray.c-400-
lib/test_xarray.c:401:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-402-}
--
lib/test_xarray.c=404=static noinline void check_cmpxchg(struct xarray *xa)
--
lib/test_xarray.c-409-
lib/test_xarray.c:410:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:411:	XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_KERNEL) != NULL);
lib/test_xarray.c:412:	XA_BUG_ON(xa, xa_insert(xa, 12345678, xa, GFP_KERNEL) != -EBUSY);
lib/test_xarray.c:413:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, SIX, FIVE, GFP_KERNEL) != LOTS);
lib/test_xarray.c:414:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, LOTS, FIVE, GFP_KERNEL) != LOTS);
lib/test_xarray.c:415:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, FIVE, LOTS, GFP_KERNEL) != FIVE);
lib/test_xarray.c:416:	XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != NULL);
lib/test_xarray.c:417:	XA_BUG_ON(xa, xa_cmpxchg(xa, 5, NULL, FIVE, GFP_KERNEL) != NULL);
lib/test_xarray.c:418:	XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) != -EBUSY);
lib/test_xarray.c:419:	XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != FIVE);
lib/test_xarray.c:420:	XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) == -EBUSY);
lib/test_xarray.c-421-	xa_erase_index(xa, 12345678);
lib/test_xarray.c-422-	xa_erase_index(xa, 5);
lib/test_xarray.c:423:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-424-}
--
lib/test_xarray.c=426=static noinline void check_cmpxchg_order(struct xarray *xa)
--
lib/test_xarray.c-431-
lib/test_xarray.c:432:	XA_BUG_ON(xa, xa_store_order(xa, 0, order, FIVE, GFP_KERNEL));
lib/test_xarray.c-433-
lib/test_xarray.c-434-	/* Check entry FIVE has the order saved */
lib/test_xarray.c:435:	XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != order);
lib/test_xarray.c-436-
--
lib/test_xarray.c-438-	for (i = 0; i < (1 << order); i++) {
lib/test_xarray.c:439:		XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
lib/test_xarray.c:440:		XA_BUG_ON(xa, xa_get_order(xa, i) != order);
lib/test_xarray.c-441-	}
--
lib/test_xarray.c-443-	/* Ensure that nothing is stored at index '1 << order' */
lib/test_xarray.c:444:	XA_BUG_ON(xa, xa_load(xa, 1 << order) != NULL);
lib/test_xarray.c-445-
--
lib/test_xarray.c-449-	 */
lib/test_xarray.c:450:	XA_BUG_ON(xa, xa_store_order(xa, 1 << order, order, FIVE, GFP_KERNEL));
lib/test_xarray.c-451-	for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) {
lib/test_xarray.c:452:		XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
lib/test_xarray.c:453:		XA_BUG_ON(xa, xa_get_order(xa, i) != order);
lib/test_xarray.c-454-	}
--
lib/test_xarray.c-456-	/* Conditionally replace FIVE entry at index '0' with NULL */
lib/test_xarray.c:457:	XA_BUG_ON(xa, xa_cmpxchg(xa, 0, FIVE, NULL, GFP_KERNEL) != FIVE);
lib/test_xarray.c-458-
lib/test_xarray.c-459-	/* Verify the order is lost at FIVE (and old) entries */
lib/test_xarray.c:460:	XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != 0);
lib/test_xarray.c-461-
--
lib/test_xarray.c-463-	for (i = 0; i < (1 << order); i++) {
lib/test_xarray.c:464:		XA_BUG_ON(xa, xa_load(xa, i) != NULL);
lib/test_xarray.c:465:		XA_BUG_ON(xa, xa_get_order(xa, i) != 0);
lib/test_xarray.c-466-	}
--
lib/test_xarray.c-469-	for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) {
lib/test_xarray.c:470:		XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
lib/test_xarray.c:471:		XA_BUG_ON(xa, xa_get_order(xa, i) != order);
lib/test_xarray.c-472-	}
--
lib/test_xarray.c-474-	xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
lib/test_xarray.c:475:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-476-#endif
--
lib/test_xarray.c=479=static noinline void check_reserve(struct xarray *xa)
--
lib/test_xarray.c-485-	/* An array with a reserved entry is not empty */
lib/test_xarray.c:486:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:487:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:488:	XA_BUG_ON(xa, xa_empty(xa));
lib/test_xarray.c:489:	XA_BUG_ON(xa, xa_load(xa, 12345678));
lib/test_xarray.c-490-	xa_release(xa, 12345678);
lib/test_xarray.c:491:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-492-
lib/test_xarray.c-493-	/* Releasing a used entry does nothing */
lib/test_xarray.c:494:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:495:	XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_NOWAIT) != NULL);
lib/test_xarray.c-496-	xa_release(xa, 12345678);
lib/test_xarray.c-497-	xa_erase_index(xa, 12345678);
lib/test_xarray.c:498:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-499-
lib/test_xarray.c-500-	/* cmpxchg sees a reserved entry as ZERO */
lib/test_xarray.c:501:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:502:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, XA_ZERO_ENTRY,
lib/test_xarray.c-503-				xa_mk_value(12345678), GFP_NOWAIT) != NULL);
--
lib/test_xarray.c-505-	xa_erase_index(xa, 12345678);
lib/test_xarray.c:506:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-507-
lib/test_xarray.c-508-	/* xa_insert treats it as busy */
lib/test_xarray.c:509:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:510:	XA_BUG_ON(xa, xa_insert(xa, 12345678, xa_mk_value(12345678), 0) !=
lib/test_xarray.c-511-			-EBUSY);
lib/test_xarray.c:512:	XA_BUG_ON(xa, xa_empty(xa));
lib/test_xarray.c:513:	XA_BUG_ON(xa, xa_erase(xa, 12345678) != NULL);
lib/test_xarray.c:514:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-515-
--
lib/test_xarray.c-517-	xa_store_index(xa, 5, GFP_KERNEL);
lib/test_xarray.c:518:	XA_BUG_ON(xa, xa_reserve(xa, 6, GFP_KERNEL) != 0);
lib/test_xarray.c-519-	xa_store_index(xa, 7, GFP_KERNEL);
--
lib/test_xarray.c-522-	xa_for_each(xa, index, entry) {
lib/test_xarray.c:523:		XA_BUG_ON(xa, index != 5 && index != 7);
lib/test_xarray.c-524-		count++;
lib/test_xarray.c-525-	}
lib/test_xarray.c:526:	XA_BUG_ON(xa, count != 2);
lib/test_xarray.c-527-
--
lib/test_xarray.c-531-
lib/test_xarray.c:532:		XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(8),
lib/test_xarray.c-533-					XA_LIMIT(5, 10), GFP_KERNEL) != 0);
lib/test_xarray.c:534:		XA_BUG_ON(xa, id != 8);
lib/test_xarray.c-535-
lib/test_xarray.c-536-		xa_release(xa, 6);
lib/test_xarray.c:537:		XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(6),
lib/test_xarray.c-538-					XA_LIMIT(5, 10), GFP_KERNEL) != 0);
lib/test_xarray.c:539:		XA_BUG_ON(xa, id != 6);
lib/test_xarray.c-540-	}
--
lib/test_xarray.c=545=static noinline void check_xas_erase(struct xarray *xa)
--
lib/test_xarray.c-573-		xas_for_each(&xas, entry, ULONG_MAX) {
lib/test_xarray.c:574:			XA_BUG_ON(xa, entry != xa_mk_index(j));
lib/test_xarray.c-575-			xas_store(&xas, NULL);
--
lib/test_xarray.c-578-		xas_unlock(&xas);
lib/test_xarray.c:579:		XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-580-	}
--
lib/test_xarray.c=584=static noinline void check_multi_store_1(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-591-	xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
lib/test_xarray.c:592:	XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(index));
lib/test_xarray.c:593:	XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(index));
lib/test_xarray.c:594:	XA_BUG_ON(xa, xa_load(xa, max) != NULL);
lib/test_xarray.c:595:	XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
lib/test_xarray.c-596-
lib/test_xarray.c-597-	xas_lock(&xas);
lib/test_xarray.c:598:	XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index));
lib/test_xarray.c-599-	xas_unlock(&xas);
lib/test_xarray.c:600:	XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(min));
lib/test_xarray.c:601:	XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(min));
lib/test_xarray.c:602:	XA_BUG_ON(xa, xa_load(xa, max) != NULL);
lib/test_xarray.c:603:	XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
lib/test_xarray.c-604-
lib/test_xarray.c-605-	xa_erase_index(xa, min);
lib/test_xarray.c:606:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-607-}
--
lib/test_xarray.c=609=static noinline void check_multi_store_2(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-615-	xas_lock(&xas);
lib/test_xarray.c:616:	XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(1)) != xa_mk_value(0));
lib/test_xarray.c:617:	XA_BUG_ON(xa, xas.xa_index != index);
lib/test_xarray.c:618:	XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
lib/test_xarray.c-619-	xas_unlock(&xas);
lib/test_xarray.c:620:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-621-}
--
lib/test_xarray.c=623=static noinline void check_multi_store_3(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-633-	xas_for_each(&xas, entry, ULONG_MAX) {
lib/test_xarray.c:634:		XA_BUG_ON(xa, entry != xa_mk_index(index));
lib/test_xarray.c-635-		n++;
lib/test_xarray.c-636-	}
lib/test_xarray.c:637:	XA_BUG_ON(xa, n != 1);
lib/test_xarray.c-638-	xas_set(&xas, index + 1);
lib/test_xarray.c-639-	xas_for_each(&xas, entry, ULONG_MAX) {
lib/test_xarray.c:640:		XA_BUG_ON(xa, entry != xa_mk_index(index));
lib/test_xarray.c-641-		n++;
lib/test_xarray.c-642-	}
lib/test_xarray.c:643:	XA_BUG_ON(xa, n != 2);
lib/test_xarray.c-644-	xas_unlock(&xas);
--
lib/test_xarray.c=650=static noinline void check_multi_store(struct xarray *xa)
--
lib/test_xarray.c-657-	xa_store_order(xa, 0, 1, xa_mk_value(0), GFP_KERNEL);
lib/test_xarray.c:658:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
lib/test_xarray.c:659:	XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
lib/test_xarray.c:660:	XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
lib/test_xarray.c-661-	rcu_read_lock();
lib/test_xarray.c:662:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 2);
lib/test_xarray.c:663:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
lib/test_xarray.c-664-	rcu_read_unlock();
--
lib/test_xarray.c-667-	xa_store(xa, 3, xa, GFP_KERNEL);
lib/test_xarray.c:668:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
lib/test_xarray.c:669:	XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
lib/test_xarray.c:670:	XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
lib/test_xarray.c-671-	rcu_read_lock();
lib/test_xarray.c:672:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 3);
lib/test_xarray.c:673:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
lib/test_xarray.c-674-	rcu_read_unlock();
--
lib/test_xarray.c-677-	xa_store_order(xa, 0, 2, xa_mk_value(1), GFP_KERNEL);
lib/test_xarray.c:678:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(1));
lib/test_xarray.c:679:	XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(1));
lib/test_xarray.c:680:	XA_BUG_ON(xa, xa_load(xa, 2) != xa_mk_value(1));
lib/test_xarray.c:681:	XA_BUG_ON(xa, xa_load(xa, 3) != xa_mk_value(1));
lib/test_xarray.c:682:	XA_BUG_ON(xa, xa_load(xa, 4) != NULL);
lib/test_xarray.c-683-	rcu_read_lock();
lib/test_xarray.c:684:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 4);
lib/test_xarray.c:685:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 4);
lib/test_xarray.c-686-	rcu_read_unlock();
--
lib/test_xarray.c-689-	xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
lib/test_xarray.c:690:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-691-
--
lib/test_xarray.c-695-	xa_store_order(xa, 0, 2, NULL, GFP_KERNEL);
lib/test_xarray.c:696:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-697-
--
lib/test_xarray.c-705-				if ((i < k) && (j < k))
lib/test_xarray.c:706:					XA_BUG_ON(xa, entry != NULL);
lib/test_xarray.c-707-				else
lib/test_xarray.c:708:					XA_BUG_ON(xa, entry != xa_mk_index(j));
lib/test_xarray.c-709-			}
--
lib/test_xarray.c-711-			xa_erase(xa, 0);
lib/test_xarray.c:712:			XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-713-		}
--
lib/test_xarray.c=732=static noinline void check_xa_multi_store_adv_add(struct xarray *xa,
--
lib/test_xarray.c-740-	/* users are responsible for index alignemnt to the order when adding */
lib/test_xarray.c:741:	XA_BUG_ON(xa, index & (nrpages - 1));
lib/test_xarray.c-742-
--
lib/test_xarray.c-755-		 */
lib/test_xarray.c:756:		XA_BUG_ON(xa, xas_error(&xas) && xas_error(&xas) != -ENOMEM);
lib/test_xarray.c-757-	} while (xas_nomem(&xas, GFP_KERNEL));
lib/test_xarray.c-758-
lib/test_xarray.c:759:	XA_BUG_ON(xa, xas_error(&xas));
lib/test_xarray.c:760:	XA_BUG_ON(xa, xa_load(xa, index) != p);
lib/test_xarray.c-761-}
--
lib/test_xarray.c=817=static noinline void check_xa_multi_store_adv(struct xarray *xa,
--
lib/test_xarray.c-832-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:833:		XA_BUG_ON(xa, test_get_entry(xa, base + i) != &some_val);
lib/test_xarray.c-834-
lib/test_xarray.c:835:	XA_BUG_ON(xa, test_get_entry(xa, next_index) != NULL);
lib/test_xarray.c-836-
--
lib/test_xarray.c-838-	check_xa_multi_store_adv_add(xa, next_index, 0, &some_val_2);
lib/test_xarray.c:839:	XA_BUG_ON(xa, test_get_entry(xa, next_index) != &some_val_2);
lib/test_xarray.c-840-
--
lib/test_xarray.c-847-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:848:		XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2);
lib/test_xarray.c-849-
--
lib/test_xarray.c-851-	check_xa_multi_store_adv_delete(xa, base, order);
lib/test_xarray.c:852:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-853-
--
lib/test_xarray.c-861-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:862:		XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL);
lib/test_xarray.c-863-
lib/test_xarray.c-864-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:865:		XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2);
lib/test_xarray.c-866-
lib/test_xarray.c-867-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:868:		XA_BUG_ON(xa, test_get_entry(xa, next_next_index + i) != NULL);
lib/test_xarray.c-869-
lib/test_xarray.c-870-	check_xa_multi_store_adv_delete(xa, next_index, order);
lib/test_xarray.c:871:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-872-
--
lib/test_xarray.c-877-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:878:		XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL);

]

gemini-3.6-flash

							input: 21622
							output: 35
							thoughts: 381
						

**My Assessment of the XArray Patch**

Okay, so I see the `XA_BUG_ON` macro flagged by checkpatch in `lib/test_xarray.c`.  I know that's standard for test files, a bit of a false positive we're used to seeing. No need to worry about that particular warning; it's expected behavior.

Now, let's get down to the meat of the patch. I need to carefully review the diffs, specifically focusing on `lib/xarray.c` and `lib/test_xarray.c` to see exactly what's changed and how it impacts things.

Right, looking at `lib/xarray.c`, the key change appears within the `xas_find` function.  Specifically, there's a new `else if` block added. Let me take a closer look, focusing around line 1410. I want to make sure the added logic is sound and that the surrounding code, formatting, and alignment are consistent. I need to understand why this new condition is being introduced within the `xas_find` function and what cases it's intended to handle. Is it a corner case, or something fundamental to the operation of the XArray? My aim is to spot anything that might be out of place, or inconsistent with the current style, and whether the code change is consistent with my current mental model.

map[File:lib/xarray.c FirstLine:1395 LineCount:30]

map[Contents:1395:		void *entry;
1396:	
1397:		if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
1398:			return NULL;
1399:		if (xas->xa_index > max)
1400:			return set_bounds(xas);
1401:	
1402:		if (!xas->xa_node) {
1403:			xas->xa_index = 1;
1404:			return set_bounds(xas);
1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
1417:			if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
1418:				xas->xa_offset = xas->xa_node->offset + 1;
1419:				xas->xa_node = xa_parent(xas->xa, xas->xa_node);
1420:				continue;
1421:			}
1422:	
1423:			entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
1424:			if (xa_is_node(entry)) {
]

gemini-3.6-flash

							input: 22853
							output: 37
							thoughts: 823
						

**Analyzing Indentation in XArray Code**

Okay, here's what I'm thinking. I'm taking a close look at this XArray code, specifically lines 1409-1412 and the corresponding patch diff, as indentation is super important in C. I see this `else if` condition, and initially, the indentation on line 1410 seems off: 4 tabs and 4 spaces! Then I see a corresponding `else if` in the diff and there's a difference.

I start counting characters to verify the indentation. I know a tab is equivalent to 8 spaces in the kernel coding style, so I am going to convert all tabs into spaces. I'm focusing on aligning the continuation lines within the conditional statements. The original code has what looks like a 20-space alignment, but in the diff, it seems like there's a 19-space alignment, which seems like the correct choice.

I'm thinking, "Is this consistent, or is there a bug in the patch?" Specifically, I want to confirm that when a line continues after an `if` or `else if` statement, it should align with the start of the expression, not the opening parenthesis of the condition. And my thought is that the original indentation in line 1410 is wrong. I think it should have been `\t\t   ` (2 tabs + 3 spaces = 19 spaces), not `\t\t    ` (2 tabs + 4 spaces = 20 spaces) to match.

To make sure I'm not missing something, I'll go check the tests for the XArray library, and I am going to read `lib/test_xarray.c` from lines 1330 to 1420 to check the coding styles of `check_find` or `check_multi_find_` functions. I need to make sure I am accounting for the existing coding style for similar function calls.

map[File:lib/test_xarray.c FirstLine:1330 LineCount:80]

map[Contents:1330:					xas_for_each_marked(&xas, entry, k, XA_MARK_0)
1331:						;
1332:					if (j > k)
1333:						XA_BUG_ON(xa,
1334:							xas.xa_node != XAS_RESTART);
1335:				}
1336:				rcu_read_unlock();
1337:			}
1338:			xa_store_index(xa, i, GFP_KERNEL);
1339:			xa_set_mark(xa, i, XA_MARK_0);
1340:		}
1341:		xa_destroy(xa);
1342:	}
1343:	
1344:	static noinline void check_find_4(struct xarray *xa)
1345:	{
1346:		unsigned long index = 0;
1347:		void *entry;
1348:	
1349:		xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
1350:	
1351:		entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1352:		XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
1353:	
1354:		entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1355:		XA_BUG_ON(xa, entry);
1356:	
1357:		xa_erase_index(xa, ULONG_MAX);
1358:	}
1359:	
1360:	static noinline void check_find(struct xarray *xa)
1361:	{
1362:		unsigned i;
1363:	
1364:		check_find_1(xa);
1365:		check_find_2(xa);
1366:		check_find_3(xa);
1367:		check_find_4(xa);
1368:	
1369:		for (i = 2; i < 10; i++)
1370:			check_multi_find_1(xa, i);
1371:		check_multi_find_2(xa);
1372:		check_multi_find_3(xa);
1373:	}
1374:	
1375:	/* See find_swap_entry() in mm/shmem.c */
1376:	static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
1377:	{
1378:		XA_STATE(xas, xa, 0);
1379:		unsigned int checked = 0;
1380:		void *entry;
1381:	
1382:		rcu_read_lock();
1383:		xas_for_each(&xas, entry, ULONG_MAX) {
1384:			if (xas_retry(&xas, entry))
1385:				continue;
1386:			if (entry == item)
1387:				break;
1388:			checked++;
1389:			if ((checked % 4) != 0)
1390:				continue;
1391:			xas_pause(&xas);
1392:		}
1393:		rcu_read_unlock();
1394:	
1395:		return entry ? xas.xa_index : -1;
1396:	}
1397:	
1398:	static noinline void check_find_entry(struct xarray *xa)
1399:	{
1400:	#ifdef CONFIG_XARRAY_MULTI
1401:		unsigned int order;
1402:		unsigned long offset, index;
1403:	
1404:		for (order = 0; order < 20; order++) {
1405:			for (offset = 0; offset < (1UL << (order + 3));
1406:			     offset += (1UL << order)) {
1407:				for (index = 0; index < (1UL << (order + 5));
1408:				     index += (1UL << order)) {
1409:					xa_store_order(xa, index, order,
]

gemini-3.6-flash

							input: 25307
							output: 33
							thoughts: 51
						

Here's my thought process, summarized as you requested:

**Navigating the Xarray Test Suite**

Okay, time to get this sorted out. I need to understand the existing structure for testing `check_multi_find_*` functions within the `lib/test_xarray.c` file. My initial step is to locate where these functions, or at least the core ones, are currently defined. The best way to do that in my opinion is to search within that specific file, `lib/test_xarray.c`, for any instances of `check_multi_find`. That keyword should show me where the relevant tests are located and how they are organized. This search is my starting point for understanding the current testing methodology.

map[Expression:check_multi_find PathPrefix:lib/test_xarray.c]

map[Output:lib/test_xarray.c=1142=static noinline void check_store_iter(struct xarray *xa)
--
lib/test_xarray.c-1179-
lib/test_xarray.c:1180:static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
lib/test_xarray.c-1181-{
--
lib/test_xarray.c-1211-
lib/test_xarray.c:1212:static noinline void check_multi_find_2(struct xarray *xa)
lib/test_xarray.c-1213-{
--
lib/test_xarray.c-1235-
lib/test_xarray.c:1236:static noinline void check_multi_find_3(struct xarray *xa)
lib/test_xarray.c-1237-{
--
lib/test_xarray.c=1360=static noinline void check_find(struct xarray *xa)
--
lib/test_xarray.c-1369-	for (i = 2; i < 10; i++)
lib/test_xarray.c:1370:		check_multi_find_1(xa, i);
lib/test_xarray.c:1371:	check_multi_find_2(xa);
lib/test_xarray.c:1372:	check_multi_find_3(xa);
lib/test_xarray.c-1373-}
]

gemini-3.6-flash

							input: 25945
							output: 37
							thoughts: 218
						

**Analyzing the Placement of `check_multi_find_4`**

Okay, so I'm looking at this patch and how it's restructuring the `check_find()` function. It seems like the existing code, from lines 1180 to 1237, defines these `check_multi_find_` functions, specifically `check_multi_find_1`, `2`, and `3`, but the call order in `check_find()` is a bit different, calling `check_multi_find_1`, `2`, and `3` *after* `check_find_1`, `2`, `3`, and `4`. The patch is putting `check_multi_find_4` right before `check_find()` and then it's called *within* `check_find()`.

My immediate concern is whether this is the optimal placement. I need to understand the dependencies and the logic flow better. To make a judgment, I'm going to focus on `check_multi_find_3`, around line 1236, as it's the adjacent multi-find function. It's likely that it has something in common with the rest of the find family.

The critical question is, does the logic in `check_multi_find_3` suggest that `check_multi_find_4` should logically follow it, or does the current placement before `check_find()` or placement after `check_multi_find_3` make better sense? I'll need to carefully examine the code in `lib/test_xarray.c`, from lines 1235 to 1270, to determine this. I'll need to read this section of the code very carefully to understand what is being done. Then, I can make an informed decision on whether the patch is logically sound or needs further adjustment regarding the placement of `check_multi_find_4`.

map[File:lib/test_xarray.c FirstLine:1235 LineCount:35]

map[Contents:1235:	
1236:	static noinline void check_multi_find_3(struct xarray *xa)
1237:	{
1238:		unsigned int order;
1239:	
1240:		for (order = 5; order < order_limit; order++) {
1241:			unsigned long index = 1UL << (order - 5);
1242:	
1243:			XA_BUG_ON(xa, !xa_empty(xa));
1244:			xa_store_order(xa, 0, order - 4, xa_mk_index(0), GFP_KERNEL);
1245:			XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT));
1246:			xa_erase_index(xa, 0);
1247:		}
1248:	}
1249:	
1250:	static noinline void check_find_1(struct xarray *xa)
1251:	{
1252:		unsigned long i, j, k;
1253:	
1254:		XA_BUG_ON(xa, !xa_empty(xa));
1255:	
1256:		/*
1257:		 * Check xa_find with all pairs between 0 and 99 inclusive,
1258:		 * starting at every index between 0 and 99
1259:		 */
1260:		for (i = 0; i < 100; i++) {
1261:			XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
1262:			xa_set_mark(xa, i, XA_MARK_0);
1263:			for (j = 0; j < i; j++) {
1264:				XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) !=
1265:						NULL);
1266:				xa_set_mark(xa, j, XA_MARK_0);
1267:				for (k = 0; k < 100; k++) {
1268:					unsigned long index = k;
1269:					void *entry = xa_find(xa, &index, ULONG_MAX,
]

gemini-3.6-flash

							input: 27235
							output: 37
							thoughts: 3429
						

**Analysis and Adjustment of Function Placement**

Okay, let's break this down. My initial observation flags the placement of `check_multi_find_4` relative to its counterparts (`check_multi_find_1`, `2`, and `3`) within the broader `check_find()` function. The order currently places it after all the `check_find_` functions. However, given the naming convention and purpose, it seems logical that `check_multi_find_4` should immediately follow `check_multi_find_3`. This is likely a formatting issue.

My main concern is whether this change aligns with kernel coding style and surrounding code rules, not whether the logic will work. I reviewed the instructions and the mandate is purely about formatting, code style, and checkpatch compliance. I'm not supposed to make logic changes, even if I *think* they make sense. My job is to ensure the formatting.

I need to confirm the indentation and spacing are correct. I inspected the code within `lib/test_xarray.c` and found one questionable area in `lib/xarray.c`. A specific line was misaligned by a single space, likely an accidental error, and an additional line to ensure alignment was added to the `else if` statements. I ensured alignment was consistent by aligning to the `(` on the condition. The overall result has the `else if` starting at column 19, consistent with the other similar lines.

Now, I re-reviewed the `checkpatch` output and found it gave ZERO errors on the lines I adjusted. There were some warnings related to `BUG` calls in `lib/test_xarray.c`. Since that's outside of my scope I will ignore it.

Finally, I analyzed the structure of the other `check_multi_find_*` functions and confirmed they are similar in structure and formatting, so a simple reordering of the function call in `check_find()` should be sufficient to meet the requirements of the patch, and I am not making a logic change.

map[File:lib/test_xarray.c FirstLine:1180 LineCount:70]

map[Contents:1180:	static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
1181:	{
1182:	#ifdef CONFIG_XARRAY_MULTI
1183:		unsigned long multi = 3 << order;
1184:		unsigned long next = 4 << order;
1185:		unsigned long index;
1186:	
1187:		xa_store_order(xa, multi, order, xa_mk_value(multi), GFP_KERNEL);
1188:		XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL) != NULL);
1189:		XA_BUG_ON(xa, xa_store_index(xa, next + 1, GFP_KERNEL) != NULL);
1190:	
1191:		index = 0;
1192:		XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
1193:				xa_mk_value(multi));
1194:		XA_BUG_ON(xa, index != multi);
1195:		index = multi + 1;
1196:		XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
1197:				xa_mk_value(multi));
1198:		XA_BUG_ON(xa, (index < multi) || (index >= next));
1199:		XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
1200:				xa_mk_value(next));
1201:		XA_BUG_ON(xa, index != next);
1202:		XA_BUG_ON(xa, xa_find_after(xa, &index, next, XA_PRESENT) != NULL);
1203:		XA_BUG_ON(xa, index != next);
1204:	
1205:		xa_erase_index(xa, multi);
1206:		xa_erase_index(xa, next);
1207:		xa_erase_index(xa, next + 1);
1208:		XA_BUG_ON(xa, !xa_empty(xa));
1209:	#endif
1210:	}
1211:	
1212:	static noinline void check_multi_find_2(struct xarray *xa)
1213:	{
1214:		unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1;
1215:		unsigned int i, j;
1216:		void *entry;
1217:	
1218:		for (i = 0; i < max_order; i++) {
1219:			unsigned long index = 1UL << i;
1220:			for (j = 0; j < index; j++) {
1221:				XA_STATE(xas, xa, j + index);
1222:				xa_store_index(xa, index - 1, GFP_KERNEL);
1223:				xa_store_order(xa, index, i, xa_mk_index(index),
1224:						GFP_KERNEL);
1225:				rcu_read_lock();
1226:				xas_for_each(&xas, entry, ULONG_MAX) {
1227:					xa_erase_index(xa, index);
1228:				}
1229:				rcu_read_unlock();
1230:				xa_erase_index(xa, index - 1);
1231:				XA_BUG_ON(xa, !xa_empty(xa));
1232:			}
1233:		}
1234:	}
1235:	
1236:	static noinline void check_multi_find_3(struct xarray *xa)
1237:	{
1238:		unsigned int order;
1239:	
1240:		for (order = 5; order < order_limit; order++) {
1241:			unsigned long index = 1UL << (order - 5);
1242:	
1243:			XA_BUG_ON(xa, !xa_empty(xa));
1244:			xa_store_order(xa, 0, order - 4, xa_mk_index(0), GFP_KERNEL);
1245:			XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT));
1246:			xa_erase_index(xa, 0);
1247:		}
1248:	}
1249:	
]

gemini-3.6-flash

							input: 32377
							output: 31
							thoughts: 154
						

**XArray Multi-Find Investigation**

Okay, here we go. Let's dig into these multi-find functions: `check_multi_find_1`, `check_multi_find_2`, and `check_multi_find_3`. My intuition is telling me that there's something interesting here with the multi-find functionality. Hang on... `check_multi_find_1` is conditionally compiled with `#ifdef CONFIG_XARRAY_MULTI`? Interesting. That's a good place to start. Now, `check_multi_find_2` is also related. It seems to have a `max_order` that's set based on `IS_ENABLED(CONFIG_XARRAY_MULTI)`. This feels like it is a good indicator of what I am looking for.

Now, my mind goes to the allocation/splitting logic, `xas_split_alloc` and `xas_split`. I need to track down where `xas_split` is being used within `lib/test_xarray.c`. I will have to search for it in `test_xarray.c`. That should show me how these multi-find functions are being tested and how the split logic is involved.

map[Expression:xas_split PathPrefix:lib/test_xarray.c]

map[Output:lib/test_xarray.c=1836=static void check_split_1(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-1845-
lib/test_xarray.c:1846:	xas_split_alloc(&xas, xa, order, GFP_KERNEL);
lib/test_xarray.c-1847-	xas_lock(&xas);
lib/test_xarray.c:1848:	xas_split(&xas, xa, order);
lib/test_xarray.c-1849-	for (i = 0; i < (1 << order); i += (1 << new_order))
]

gemini-3.6-flash

							input: 33001
							output: 37
							thoughts: 41
						

Okay, let's dive into this. Here's how I'd approach that snippet of code, presented as my internal thought process:

**Diving into `xas_split` Tests**

Alright, so someone's asked me to look at lines 1830 to 1860 within `lib/test_xarray.c`. My first thought is: "Why those specific lines?" Are we looking at a particular test case, a specific guard condition, or perhaps a problematic section of the `xas_split` testing? I need some context.

First things first, I'm going to pull up that file and jump to those lines. Let's see what the code itself is telling us. I'll be looking for clues immediately. I'll scan the lines for:

*   **Guard Conditions:** Are there `#ifdef`, `#if`, or similar preprocessor directives controlling the compilation or execution of these tests? Understanding the guard conditions is *crucial*. They tell us when and where these tests run, and if a bug *doesn't* appear, what are the conditions that *don't* permit it to appear.
*   **Test Definitions:** How are the tests themselves defined? Are they using a testing framework (e.g., `TEST_CASE`, `ASSERT`, etc.)? Are there multiple test cases packed into the section?
*   **Data Setup/Tear-down:** How is the data for the `xas_split` tests set up? Is there a common fixture or setup routine used? Similarly, how are resources cleaned up after the tests run? If this data is not set up correctly, it is a significant potential source of problems.
*   **Specific Assertions:** What specific assertions are being made related to `xas_split`? That tells me what the tests are *supposed* to be verifying. Are there error paths being tested, or only successful outcomes? If it is a failure case, it could be that the assertion is too permissive.
*   **Potential Problem Areas:** I'll be quickly looking for anything that stands out as potentially problematic. Unusual data types, complex logic within the tests themselves, and anything that screams "fragile" or "error-prone" will immediately grab my attention.
*   **Comments:** Hopefully, there are some clarifying comments in the code. Good comments can often provide context that is otherwise missing.

I'll be asking myself questions throughout: "Why is *this* particular path being tested? What assumptions are these tests making about the `xas_split` function's behavior? Are there edge cases here that the tests might be missing? What might cause this test to fail?"

Once I've got a grasp of the code in that section, I'll start formulating an assessment. Are the tests well-written? Are they comprehensive? Do they cover the relevant aspects of `xas_split`'s functionality? I'll probably also cross-reference with any existing documentation or bug reports related to this function to see if there's any pre-existing knowledge about potential issues.

Essentially, I'm looking to form a complete understanding of what's happening and figure out where the weakness is.

map[File:lib/test_xarray.c FirstLine:1830 LineCount:30]

map[Contents:1830:				__check_store_range(xa, (1 << 24) + i, (1 << 24) + j);
1831:			}
1832:		}
1833:	}
1834:	
1835:	#ifdef CONFIG_XARRAY_MULTI
1836:	static void check_split_1(struct xarray *xa, unsigned long index,
1837:					unsigned int order, unsigned int new_order)
1838:	{
1839:		XA_STATE_ORDER(xas, xa, index, new_order);
1840:		unsigned int i, found;
1841:		void *entry;
1842:	
1843:		xa_store_order(xa, index, order, xa, GFP_KERNEL);
1844:		xa_set_mark(xa, index, XA_MARK_1);
1845:	
1846:		xas_split_alloc(&xas, xa, order, GFP_KERNEL);
1847:		xas_lock(&xas);
1848:		xas_split(&xas, xa, order);
1849:		for (i = 0; i < (1 << order); i += (1 << new_order))
1850:			__xa_store(xa, index + i, xa_mk_index(index + i), 0);
1851:		xas_unlock(&xas);
1852:	
1853:		for (i = 0; i < (1 << order); i++) {
1854:			unsigned int val = index + (i & ~((1 << new_order) - 1));
1855:			XA_BUG_ON(xa, xa_load(xa, index + i) != xa_mk_index(val));
1856:		}
1857:	
1858:		xa_set_mark(xa, index, XA_MARK_0);
1859:		XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
]

gemini-3.6-flash

							input: 34299
							output: 33
							thoughts: 123
						

**XArray Discrepancy Alert!**

Okay, hold on a second. I'm seeing something that doesn't quite sit right here with `xas_split_alloc`. In `check_split_1`, the signature looks like `xas_split_alloc(&xas, entry, order, gfp)`, but over in `check_multi_find_4`, it's `xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL)`.  And then we have `xas_split(&xas, xa_mk_index(0), 7);` being called separately. Why the inconsistency in arguments?

I need to quickly verify this. My gut is telling me the `xa_mk_index(0)` and the `7` are significant, which is why they differ. I'm going to jump straight into either the `include/linux/xarray.h` file or `lib/xarray.c` right now. Need to refresh my memory on that `xas_split` definition and understand the implications of these different invocations. This could be nothing, but I need to make sure I understand the intent here.

map[ContextFile:lib/xarray.c Name:xas_split]

map[SourceCode:1075:	/**
1076:	 * xas_split() - Split a multi-index entry into smaller entries.
1077:	 * @xas: XArray operation state.
1078:	 * @entry: New entry to store in the array.
1079:	 * @order: Current entry order.
1080:	 *
1081:	 * The size of the new entries is set in @xas.  The value in @entry is
1082:	 * copied to all the replacement entries.
1083:	 *
1084:	 * Context: Any context.  The caller should hold the xa_lock.
1085:	 */
1086:	void xas_split(struct xa_state *xas, void *entry, unsigned int order)
1087:	{
1088:		unsigned int sibs = (1 << (order % XA_CHUNK_SHIFT)) - 1;
1089:		unsigned int offset, marks;
1090:		struct xa_node *node;
1091:		void *curr = xas_load(xas);
1092:		int values = 0;
1093:	
1094:		node = xas->xa_node;
1095:		if (xas_top(node))
1096:			return;
1097:	
1098:		marks = node_get_marks(node, xas->xa_offset);
1099:	
1100:		offset = xas->xa_offset + sibs;
1101:		do {
1102:			if (xas->xa_shift < node->shift) {
1103:				struct xa_node *child = xas->xa_alloc;
1104:	
1105:				xas->xa_alloc = rcu_dereference_raw(child->parent);
1106:				child->shift = node->shift - XA_CHUNK_SHIFT;
1107:				child->offset = offset;
1108:				child->count = XA_CHUNK_SIZE;
1109:				child->nr_values = xa_is_value(entry) ?
1110:						XA_CHUNK_SIZE : 0;
1111:				RCU_INIT_POINTER(child->parent, node);
1112:				node_set_marks(node, offset, child, xas->xa_sibs,
1113:						marks);
1114:				rcu_assign_pointer(node->slots[offset],
1115:						xa_mk_node(child));
1116:				if (xa_is_value(curr))
1117:					values--;
1118:				xas_update(xas, child);
1119:			} else {
1120:				unsigned int canon = offset - xas->xa_sibs;
1121:	
1122:				node_set_marks(node, canon, NULL, 0, marks);
1123:				rcu_assign_pointer(node->slots[canon], entry);
1124:				while (offset > canon)
1125:					rcu_assign_pointer(node->slots[offset--],
1126:							xa_mk_sibling(canon));
1127:				values += (xa_is_value(entry) - xa_is_value(curr)) *
1128:						(xas->xa_sibs + 1);
1129:			}
1130:		} while (offset-- > xas->xa_offset);
1131:	
1132:		node->nr_values += values;
1133:		xas_update(xas, node);
1134:	}
 SourceFile:lib/xarray.c]

gemini-3.6-flash

							input: 35682
							output: 31
							thoughts: 860
						

**XArray Multi-Entry Investigation**

Okay, so I'm looking at these `xas_split` and `xas_split_alloc` calls again. They take a `struct xa_state *xas`, an entry, and an order. `xas_split_alloc` also takes a `gfp_t` for memory allocation. Now, let's circle back to `lib/test_xarray.c`.

I'm focused on understanding the interplay of these functions, especially within the context of multi-entry XArrays. Let's see what `check_multi_find_4` does. I see it stores entries at index 0 and 128, then checks for them using `xas_find` and `xas_next_entry`. The interesting part is that `xas_split_alloc` and `xas_split` are called, which are the main focus of my investigation. It seems we need to understand the behaviour of these functions.

Now, I need to know if `check_multi_find_4` is conditional based on `CONFIG_XARRAY_MULTI`. The other `check_multi_find_` functions (1, 2, and 3) do have conditional compilation. I'm seeing that `check_multi_find_1` is placed under `#ifdef CONFIG_XARRAY_MULTI`, `check_multi_find_2` uses `IS_ENABLED(CONFIG_XARRAY_MULTI)` to determine `max_order`, and `check_multi_find_3` uses `order` in a loop.

Wait, I need to know the definition of `order_limit`. I'm searching to see where it is defined in `lib/test_xarray.c`. This will give me further context for what is happening inside the loop of the third test function.

map[Expression:order_limit PathPrefix:lib/test_xarray.c]

map[Output:lib/test_xarray.c=13=static unsigned int tests_passed;
lib/test_xarray.c-14-
lib/test_xarray.c:15:static const unsigned int order_limit =
lib/test_xarray.c-16-		IS_ENABLED(CONFIG_XARRAY_MULTI) ? BITS_PER_LONG : 1;
--
lib/test_xarray.c=1236=static noinline void check_multi_find_3(struct xarray *xa)
--
lib/test_xarray.c-1239-
lib/test_xarray.c:1240:	for (order = 5; order < order_limit; order++) {
lib/test_xarray.c-1241-		unsigned long index = 1UL << (order - 5);
--
lib/test_xarray.c=1430=static noinline void check_pause(struct xarray *xa)
--
lib/test_xarray.c-1437-
lib/test_xarray.c:1438:	for (order = 0; order < order_limit; order++) {
lib/test_xarray.c-1439-		XA_BUG_ON(xa, xa_store_order(xa, index, order,
--
lib/test_xarray.c-1449-	rcu_read_unlock();
lib/test_xarray.c:1450:	XA_BUG_ON(xa, count != order_limit);
lib/test_xarray.c-1451-
--
lib/test_xarray.c-1460-	rcu_read_unlock();
lib/test_xarray.c:1461:	XA_BUG_ON(xa, count != order_limit);
lib/test_xarray.c-1462-
--
lib/test_xarray.c-1465-	index = 0;
lib/test_xarray.c:1466:	for (order = order_limit - 1; order >= 0; order--) {
lib/test_xarray.c-1467-		XA_BUG_ON(xa, xa_store_order(xa, index, order,
--
lib/test_xarray.c-1477-		XA_BUG_ON(xa, entry != xa_mk_index(index));
lib/test_xarray.c:1478:		index += 1UL << (order_limit - count - 1);
lib/test_xarray.c-1479-		count++;
--
lib/test_xarray.c-1481-	rcu_read_unlock();
lib/test_xarray.c:1482:	XA_BUG_ON(xa, count != order_limit);
lib/test_xarray.c-1483-
--
lib/test_xarray.c-1486-	/* test unaligned index */
lib/test_xarray.c:1487:	xas_set(&xas, 1 % (1UL << (order_limit - 1)));
lib/test_xarray.c-1488-	rcu_read_lock();
--
lib/test_xarray.c-1490-		XA_BUG_ON(xa, entry != xa_mk_index(index));
lib/test_xarray.c:1491:		index += 1UL << (order_limit - count - 1);
lib/test_xarray.c-1492-		count++;
--
lib/test_xarray.c-1495-	rcu_read_unlock();
lib/test_xarray.c:1496:	XA_BUG_ON(xa, count != order_limit);
lib/test_xarray.c-1497-
]

gemini-3.6-flash

							input: 37924
							output: 31
							thoughts: 91
						

**Investigating XArray Dependency**

Okay, so I'm trying to figure out if we really *need* the `CONFIG_XARRAY_MULTI` flag for the `check_multi_find_4` function. The key here is whether `xas_split_alloc` and `xas_split` function properly without the multi-array configuration. That's the real dependency that could necessitate the `#ifdef`. Hold on... *is* `xas_split` even available without the multi-array support? I need to verify that before assuming the worst. Right, the most reliable way to check that is to look directly at the definition of `xas_split`. Time to crack open `include/linux/xarray.h` and see what the header file reveals about the availability of `xas_split`. Let's get to the source.

map[Expression:xas_split PathPrefix:include/linux/xarray.h]

map[Output:include/linux/xarray.h=1561=int xas_get_order(struct xa_state *xas);
include/linux/xarray.h:1562:void xas_split(struct xa_state *, void *entry, unsigned int order);
include/linux/xarray.h:1563:void xas_split_alloc(struct xa_state *, void *entry, unsigned int order, gfp_t);
include/linux/xarray.h-1564-void xas_try_split(struct xa_state *xas, void *entry, unsigned int order);
--
include/linux/xarray.h=1572=static inline int xas_get_order(struct xa_state *xas)
--
include/linux/xarray.h-1576-
include/linux/xarray.h:1577:static inline void xas_split(struct xa_state *xas, void *entry,
include/linux/xarray.h-1578-		unsigned int order)
--
include/linux/xarray.h-1582-
include/linux/xarray.h:1583:static inline void xas_split_alloc(struct xa_state *xas, void *entry,
include/linux/xarray.h-1584-		unsigned int order, gfp_t gfp)
]

gemini-3.6-flash

							input: 38557
							output: 9
							thoughts: 2491
						

**Code Review and Formatting Assessment**

Okay, so I'm diving into this patch for `lib/test_xarray.c`.  First, I need to confirm the definitions of `xas_split` and `xas_split_alloc` in `include/linux/xarray.h`. It looks like these functions are handled correctly, both under `CONFIG_XARRAY_MULTI` and as inline stubs when the config is disabled. I'm focusing on the formatting and adherence to kernel coding style, so I need to make sure this patch doesn't introduce any unnecessary conditional compilation or deviations from established conventions.

Initially, I see `check_multi_find_4` in the patch. I need to make absolutely sure that no `#ifdef CONFIG_XARRAY_MULTI` directives are needed, or inadvertently added. The provided code snippet from the patch confirms this, and I see no need for such directives based on the code logic.

Now, let's make sure `check_multi_find_4` is placed appropriately. It looks like it follows `check_find_4` and precedes `check_find` as it should. Placement is correct according to the surrounding code structure.

My primary focus here is formatting. Let's make sure spacing and indentation are consistent, and that there are no blank lines or variable declarations that deviate from the established style. I'll need to scrutinize this block:

```c
static noinline void check_multi_find_4(struct xarray *xa)
{
	XA_STATE(xas, xa, 0);
	void *entry;

	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);

	rcu_read_lock();
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));

	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(128));
	rcu_read_unlock();

	xa_destroy(xa);

	xas_set(&xas, 0);
	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);

	rcu_read_lock();
	entry = xas_find(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));

	xas_lock(&xas);
	xas_split(&xas, xa_mk_index(0), 7);
	xas_unlock(&xas);

	entry = xas_next_entry(&xas, ULONG_MAX);
	XA_BUG_ON(xa, entry != xa_mk_index(0));
	XA_BUG_ON(xa, xas.xa_index != 64);
	rcu_read_unlock();

	xa_destroy(xa);
}
```

Now, let's carefully check the indentation in `lib/xarray.c` in function `xas_find`:

```c
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 ```

I see a possible issue.  I am checking indentation for the line:

```c
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
+	}
```

The continuation line `xas->xa_offset != get_

map[Output:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
]

gemini-3.6-flash

							input: 42576
							output: 120
							thoughts: 245
						

**My Assessment of the Patch's Formatting Compliance**

Okay, so the `checkpatch` output flags only five warnings related to `XA_BUG_ON`. Given my experience, I recognize this is typical for `lib/test_xarray.c`. This file *is* a test module, and it's practically designed to leverage `XA_BUG_ON` extensively for assertions. It's expected, essentially a false positive in this context.

Now, let's just make *absolutely* sure. Back to the instructions. "Purely formatting," which means confirming style compliance, adherence to surrounding code rules, and a clean checkpatch result while leaving the logic untouched. No questioning changes unless they are clearly incorrect. If the checkpatch is happy, then we stop.

Looking over the diff, there are no formatting issues; the style conforms to the kernel standards, the surrounding code rules are respected, and there are zero errors from `checkpatch`. The only warnings are the aforementioned false positives.

Therefore, no edits are necessary here. The patch is already perfect. My task is complete. We can move on.

map[PatchDiff:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 TestError:]

map[CheckpatchOutput:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
 NeedRefinement:true]

good-balanced

You are an expert Linux kernel developer tasked with formatting a kernel patch.
Your objective is purely formatting: you must ensure the patch complies with the kernel's coding style,
conforms to the surrounding code rules, and passes checkpatch.pl, while preserving the code logic exactly as it is.
You should stop once the requested formatting changes are done and checkpatch.pl is happy.
Do not question the requested changes unless they are obviously wrong.
If the code already conforms to the requested changes, surrounding code rules,
and checkpatch.pl is happy, you should just finish your task.

WARNING: The clang-format tool may break the formatting of the surrounding code (like manual alignment).
Use it with caution. We want to make the change fit into the existing formatting as much as possible.

Prefer calling several tools at the same time to save round-trips.

The current patch diff is:

diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);





The checkpatch.pl output is:
WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.






Your previous reasoning was:
The patch formatting has been reviewed and verified:
- The indentation, line wrapping, and code style in both `lib/xarray.c` and `lib/test_xarray.c` conform strictly to Linux kernel coding conventions and match the surrounding code.
- `checkpatch.pl` reports 0 errors. The reported warnings regarding `XA_BUG_ON` are expected false positives for `lib/test_xarray.c`, which uses `XA_BUG_ON` throughout for test assertions.
- The logic and behavior of the patch are fully preserved.


Use the provided tools to format the patch.

The patch formatting has been reviewed and verified:
- Coding style and alignment in both `lib/xarray.c` and `lib/test_xarray.c` strictly follow Linux kernel conventions and fit smoothly with the surrounding code.
- `checkpatch.pl` reports 0 errors. The 5 warnings reported for `XA_BUG_ON` are expected false positives for test assertions in `lib/test_xarray.c`.
- The code logic and behavior remain unchanged.

gemini-3.6-flash

							input: 6029
							output: 19
							thoughts: 52
						

Okay, here's my thought process on reviewing this patch, as an expert:

**Reviewing the Patch: A Checkpatch First Approach**

Alright, before I dive too deep, I need to get a handle on the current state of this patch. My immediate instinct is to look at the `checkpatch` output. But before I even do that, it's smarter to either run `checkpatch` directly, or if I have some kind of diff or patch already, quickly eyeball that first. Get a lay of the land, see if anything screams out at me.

Okay, best practice dictates that instead of just jumping right in, I'll call `patch-diff` and then `checkpatch`, so I can see what is actually changing, before running a check on the changes.

log-in to see details

map[Output:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
]

gemini-3.6-flash

							input: 6776
							output: 15
							thoughts: 30
						

Okay, here's my take on those thoughts, framed as my own:

**Analyzing the `patch-diff` Behavior**

Right, so I'm thinking about how `patch-diff` works. I've realized, based on my understanding of how these utilities function, that it needs a specific flag, or at least a specific usage pattern, to display *all* changes across a whole set of files. I'm hypothesizing that setting the `File` parameter to an empty string, essentially indicating "no specific file," might be the key to triggering this comprehensive view. Therefore, I should go ahead and experiment with calling `patch-diff` with `File: ""`. That should show me the difference across all the changed files. I'm curious to see if that works as expected.

map[File:]

map[Output:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1350,28 +1350,68 @@ static noinline void check_find_4(struct xarray *xa)
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry);
 
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
 
 	check_find_1(xa);
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
 	check_multi_find_2(xa);
 	check_multi_find_3(xa);
 }
 
 /* See find_swap_entry() in mm/shmem.c */
 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
 {
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1377,62 +1377,65 @@ EXPORT_SYMBOL_GPL(__xas_next);
 /**
  * xas_find() - Find the next present entry in the XArray.
  * @xas: XArray operation state.
  * @max: Highest index to return.
  *
  * If the @xas has not yet been walked to an entry, return the entry
  * which has an index >= xas.xa_index.  If it has been walked, the entry
  * currently being pointed at has been processed, and so we move to the
  * next entry.
  *
  * If no entry is found and the array is smaller than @max, the iterator
  * is set to the smallest index not yet in the array.  This allows @xas
  * to be immediately passed to xas_store().
  *
  * Return: The entry, if found, otherwise %NULL.
  */
 void *xas_find(struct xa_state *xas, unsigned long max)
 {
 	void *entry;
 
 	if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
 		return NULL;
 	if (xas->xa_index > max)
 		return set_bounds(xas);
 
 	if (!xas->xa_node) {
 		xas->xa_index = 1;
 		return set_bounds(xas);
 	} else if (xas->xa_node == XAS_RESTART) {
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 
 	while (xas->xa_node && (xas->xa_index <= max)) {
 		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
 			xas->xa_offset = xas->xa_node->offset + 1;
 			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
 			continue;
 		}
 
 		entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
 		if (xa_is_node(entry)) {
 			xas->xa_node = xa_to_node(entry);
 			xas->xa_offset = 0;
 			continue;
 		}
 		if (entry && !xa_is_sibling(entry))
 			return entry;
 
 		xas_next_offset(xas);
 	}
 
 	if (!xas->xa_node)
 		xas->xa_node = XAS_BOUNDS;
 	return NULL;
 }
]

gemini-3.6-flash

							input: 8768
							output: 35
							thoughts: 333
						

**Investigating Potential Indentation Inconsistencies in XArray Code**

Okay, I need to dive into this `xarray` code. My initial thought is to check `lib/xarray.c` around line 1409 and see what's happening, and maybe peek at `lib/test_xarray.c` as well for context. But first, let's just focus on that specific file, `lib/xarray.c`.

I'm zeroing in on this snippet:
```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	} else if (xas->xa_node->shift &&
		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
	}
```
Now, something's jumping out at me. I'm seeing a possible indentation inconsistency here. The conditional statement `xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK))` within the `!xas->xa_node->shift` block seems to be indented with tabs and *four* spaces, whereas `xas->xa_offset != get_offset(xas->xa_index, xas->xa_node))` within the `xas->xa_node->shift` block is indented with tabs and *three* spaces. That's a potential formatting issue that could cause subtle problems.

I want to check how the file is being read and parsed, so I'll go back to `lib/xarray.c` around line 1405 and look at the `read-file` function.

map[File:lib/xarray.c FirstLine:1400 LineCount:25]

map[Contents:1400:			return set_bounds(xas);
1401:	
1402:		if (!xas->xa_node) {
1403:			xas->xa_index = 1;
1404:			return set_bounds(xas);
1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
1417:			if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
1418:				xas->xa_offset = xas->xa_node->offset + 1;
1419:				xas->xa_node = xa_parent(xas->xa, xas->xa_node);
1420:				continue;
1421:			}
1422:	
1423:			entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
1424:			if (xa_is_node(entry)) {
]

gemini-3.6-flash

							input: 10007
							output: 37
							thoughts: 773
						

**Alignment Analysis of Conditional Statements in XArray Code**

Okay, let's break down this alignment issue. I'm focusing on the `else if` conditions, specifically around how `xas->` is positioned.  It looks like I need to ensure consistent spacing and tab usage.  First, the initial case:  `} else if (!xas->...`.  The `else if` part itself is 11 characters long.  I figured that with tabs and the characters, the total offset before `xas->` should be 27, or character position 28. Then, I had to ensure that the alignment in the subsequent conditional statement, `else if (xas->...)` starts from column 27 as well to ensure that the `xas` statements are aligned.

I went through a few iterations. I had to make sure the tab widths I was using were correct to the overall code style. Then I had to check the tab count against character count. It seems that two tabs and 11 characters equals 27 spaces. So that checks out.

Okay, let's step back and look at the diff again:  `+\t} else if (xas->...` and the next line `+\t\t   xas->...`. Three tabs (24 spaces) plus 3 spaces equal 27. So the original calculation worked. I confirmed this alignment for both shifted and unshifted conditions.  In the `!xas` case, the offset is 28 because of the `!` character, and in the `xas` case the offset remains at 27.

Now, I'm going to shift gears and check for checkpatch errors or formatting issues in `lib/test_xarray.c` and `lib/xarray.c`. I will read through those files from line 1350 to 1410 specifically, particularly around the `check_multi_find_4` function.

map[File:lib/test_xarray.c FirstLine:1350 LineCount:60]

map[Contents:1350:	
1351:		entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1352:		XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
1353:	
1354:		entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1355:		XA_BUG_ON(xa, entry);
1356:	
1357:		xa_erase_index(xa, ULONG_MAX);
1358:	}
1359:	
1360:	static noinline void check_find(struct xarray *xa)
1361:	{
1362:		unsigned i;
1363:	
1364:		check_find_1(xa);
1365:		check_find_2(xa);
1366:		check_find_3(xa);
1367:		check_find_4(xa);
1368:	
1369:		for (i = 2; i < 10; i++)
1370:			check_multi_find_1(xa, i);
1371:		check_multi_find_2(xa);
1372:		check_multi_find_3(xa);
1373:	}
1374:	
1375:	/* See find_swap_entry() in mm/shmem.c */
1376:	static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
1377:	{
1378:		XA_STATE(xas, xa, 0);
1379:		unsigned int checked = 0;
1380:		void *entry;
1381:	
1382:		rcu_read_lock();
1383:		xas_for_each(&xas, entry, ULONG_MAX) {
1384:			if (xas_retry(&xas, entry))
1385:				continue;
1386:			if (entry == item)
1387:				break;
1388:			checked++;
1389:			if ((checked % 4) != 0)
1390:				continue;
1391:			xas_pause(&xas);
1392:		}
1393:		rcu_read_unlock();
1394:	
1395:		return entry ? xas.xa_index : -1;
1396:	}
1397:	
1398:	static noinline void check_find_entry(struct xarray *xa)
1399:	{
1400:	#ifdef CONFIG_XARRAY_MULTI
1401:		unsigned int order;
1402:		unsigned long offset, index;
1403:	
1404:		for (order = 0; order < 20; order++) {
1405:			for (offset = 0; offset < (1UL << (order + 3));
1406:			     offset += (1UL << order)) {
1407:				for (index = 0; index < (1UL << (order + 5));
1408:				     index += (1UL << order)) {
1409:					xa_store_order(xa, index, order,
]

gemini-3.6-flash

							input: 12114
							output: 33
							thoughts: 52
						

Okay, let's dive into this. Here's how I'd approach this, thinking out loud:

**Reviewing the `check_multi_find_*` Function Style in `lib/test_xarray.c`**

Alright, before I go any further with the `check_multi_find_4` function, I need to get a better sense of the existing conventions in `lib/test_xarray.c`. I've got to make sure this new function I'm developing fits seamlessly into the current style. So, I need to take a look at the other `check_multi_find_*` functions. I'll examine their naming, their structure, and their general approach to see if there's a pattern I should stick to. I'm looking for consistency here; adhering to an established pattern is crucial for maintainability and readability. Does `check_multi_find_4` feel like it naturally belongs with its counterparts? This initial assessment is critical to integrating it correctly.

map[Expression:check_multi_find PathPrefix:lib/test_xarray.c]

map[Output:lib/test_xarray.c=1142=static noinline void check_store_iter(struct xarray *xa)
--
lib/test_xarray.c-1179-
lib/test_xarray.c:1180:static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
lib/test_xarray.c-1181-{
--
lib/test_xarray.c-1211-
lib/test_xarray.c:1212:static noinline void check_multi_find_2(struct xarray *xa)
lib/test_xarray.c-1213-{
--
lib/test_xarray.c-1235-
lib/test_xarray.c:1236:static noinline void check_multi_find_3(struct xarray *xa)
lib/test_xarray.c-1237-{
--
lib/test_xarray.c=1360=static noinline void check_find(struct xarray *xa)
--
lib/test_xarray.c-1369-	for (i = 2; i < 10; i++)
lib/test_xarray.c:1370:		check_multi_find_1(xa, i);
lib/test_xarray.c:1371:	check_multi_find_2(xa);
lib/test_xarray.c:1372:	check_multi_find_3(xa);
lib/test_xarray.c-1373-}
]

gemini-3.6-flash

							input: 12812
							output: 37
							thoughts: 32
						

Here's my summary, as though I'm thinking through this process:

**Diving into `lib/test_xarray.c`**

Okay, time to get my hands dirty. I need to take a look at a specific chunk of code within `lib/test_xarray.c`.  Let's start by using `read-file` to zero in on lines 1180 through 1250. This section is probably where the heart of the matter lies, whatever I'm troubleshooting. I'll read through these lines to refresh my understanding and identify any potential issues or interesting patterns. I'm hoping to quickly understand the logic and how the variables are handled within this section, so I can start to formulate any hypothesis about the problem.

map[File:lib/test_xarray.c FirstLine:1180 LineCount:60]

map[Contents:1180:	static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
1181:	{
1182:	#ifdef CONFIG_XARRAY_MULTI
1183:		unsigned long multi = 3 << order;
1184:		unsigned long next = 4 << order;
1185:		unsigned long index;
1186:	
1187:		xa_store_order(xa, multi, order, xa_mk_value(multi), GFP_KERNEL);
1188:		XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL) != NULL);
1189:		XA_BUG_ON(xa, xa_store_index(xa, next + 1, GFP_KERNEL) != NULL);
1190:	
1191:		index = 0;
1192:		XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
1193:				xa_mk_value(multi));
1194:		XA_BUG_ON(xa, index != multi);
1195:		index = multi + 1;
1196:		XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
1197:				xa_mk_value(multi));
1198:		XA_BUG_ON(xa, (index < multi) || (index >= next));
1199:		XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
1200:				xa_mk_value(next));
1201:		XA_BUG_ON(xa, index != next);
1202:		XA_BUG_ON(xa, xa_find_after(xa, &index, next, XA_PRESENT) != NULL);
1203:		XA_BUG_ON(xa, index != next);
1204:	
1205:		xa_erase_index(xa, multi);
1206:		xa_erase_index(xa, next);
1207:		xa_erase_index(xa, next + 1);
1208:		XA_BUG_ON(xa, !xa_empty(xa));
1209:	#endif
1210:	}
1211:	
1212:	static noinline void check_multi_find_2(struct xarray *xa)
1213:	{
1214:		unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1;
1215:		unsigned int i, j;
1216:		void *entry;
1217:	
1218:		for (i = 0; i < max_order; i++) {
1219:			unsigned long index = 1UL << i;
1220:			for (j = 0; j < index; j++) {
1221:				XA_STATE(xas, xa, j + index);
1222:				xa_store_index(xa, index - 1, GFP_KERNEL);
1223:				xa_store_order(xa, index, i, xa_mk_index(index),
1224:						GFP_KERNEL);
1225:				rcu_read_lock();
1226:				xas_for_each(&xas, entry, ULONG_MAX) {
1227:					xa_erase_index(xa, index);
1228:				}
1229:				rcu_read_unlock();
1230:				xa_erase_index(xa, index - 1);
1231:				XA_BUG_ON(xa, !xa_empty(xa));
1232:			}
1233:		}
1234:	}
1235:	
1236:	static noinline void check_multi_find_3(struct xarray *xa)
1237:	{
1238:		unsigned int order;
1239:	
]

gemini-3.6-flash

							input: 14106
							output: 37
							thoughts: 94
						

**Investigating XArray Multi-Support Dependencies**

Okay, so I need to clarify some dependencies within this XArray code. My initial thought is about `check_multi_find_4`: does it require the `#ifdef CONFIG_XARRAY_MULTI` guard, or are functions like `xa_store_order`, `xas_split_alloc`, and `xas_split` universally available, or perhaps under that conditional? I need to know for sure. Wait a minute, before I go deeper into that specific function, I should backtrack for a moment and look at `check_multi_find_3` first, just to get a broader understanding. Let me read lines 1235 to 1270, that's where the answer will likely be.

map[File:lib/test_xarray.c FirstLine:1235 LineCount:35]

map[Contents:1235:	
1236:	static noinline void check_multi_find_3(struct xarray *xa)
1237:	{
1238:		unsigned int order;
1239:	
1240:		for (order = 5; order < order_limit; order++) {
1241:			unsigned long index = 1UL << (order - 5);
1242:	
1243:			XA_BUG_ON(xa, !xa_empty(xa));
1244:			xa_store_order(xa, 0, order - 4, xa_mk_index(0), GFP_KERNEL);
1245:			XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT));
1246:			xa_erase_index(xa, 0);
1247:		}
1248:	}
1249:	
1250:	static noinline void check_find_1(struct xarray *xa)
1251:	{
1252:		unsigned long i, j, k;
1253:	
1254:		XA_BUG_ON(xa, !xa_empty(xa));
1255:	
1256:		/*
1257:		 * Check xa_find with all pairs between 0 and 99 inclusive,
1258:		 * starting at every index between 0 and 99
1259:		 */
1260:		for (i = 0; i < 100; i++) {
1261:			XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
1262:			xa_set_mark(xa, i, XA_MARK_0);
1263:			for (j = 0; j < i; j++) {
1264:				XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) !=
1265:						NULL);
1266:				xa_set_mark(xa, j, XA_MARK_0);
1267:				for (k = 0; k < 100; k++) {
1268:					unsigned long index = k;
1269:					void *entry = xa_find(xa, &index, ULONG_MAX,
]

gemini-3.6-flash

							input: 15022
							output: 15
							thoughts: 1878
						

**Analysis of `check_multi_find_4` Patch**

Okay, so I see that `check_multi_find_4` is being introduced. I quickly verify that `check_multi_find_1`, `check_multi_find_2`, and `check_multi_find_3` are already defined in `lib/test_xarray.c`, and that the new function's placement in the diff is correct, as it's inserted after `check_find_4` and before the loop using the other `check_multi_find` functions. The placement in the `check_find` function also looks right, adding the new function to the series of calls.

Now, I need to meticulously review the code for any style violations or other issues that might trip up `checkpatch.pl`. The new function is defined as `static noinline void check_multi_find_4(struct xarray *xa)`, which seems standard for these test functions.

The content of the new function seems reasonable: it initializes an `XA_STATE`, stores and retrieves some entries, and then destroys the xarray, and also uses the `xas_split` function. The code includes calls to `rcu_read_lock()` and `rcu_read_unlock()` appropriately. The use of `XA_BUG_ON` looks like it's being used as intended for test assertions.

I check `lib/xarray.c` as the third entry in the diff touches that file. I notice that the logic introduced with the new `if` condition looks correct and uses existing helper functions `get_offset`. I assume this is a necessary part of the implementation of the new function, so I'll preserve it.

Finally, I remember I should keep an eye out for checkpatch.pl warnings. As expected, it flags the `XA_BUG_ON` calls. However, as it's test code, these warnings are acceptable and are common in this file. I'm satisfied that this patch maintains the original logic while following kernel style. The diff looks clean. There are no trailing whitespaces or formatting issues in the generated `patch-diff`. This patch is good to go.

map[File:]

map[Output:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1350,28 +1350,68 @@ static noinline void check_find_4(struct xarray *xa)
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry);
 
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
 
 	check_find_1(xa);
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
 	check_multi_find_2(xa);
 	check_multi_find_3(xa);
 }
 
 /* See find_swap_entry() in mm/shmem.c */
 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
 {
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1377,62 +1377,65 @@ EXPORT_SYMBOL_GPL(__xas_next);
 /**
  * xas_find() - Find the next present entry in the XArray.
  * @xas: XArray operation state.
  * @max: Highest index to return.
  *
  * If the @xas has not yet been walked to an entry, return the entry
  * which has an index >= xas.xa_index.  If it has been walked, the entry
  * currently being pointed at has been processed, and so we move to the
  * next entry.
  *
  * If no entry is found and the array is smaller than @max, the iterator
  * is set to the smallest index not yet in the array.  This allows @xas
  * to be immediately passed to xas_store().
  *
  * Return: The entry, if found, otherwise %NULL.
  */
 void *xas_find(struct xa_state *xas, unsigned long max)
 {
 	void *entry;
 
 	if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
 		return NULL;
 	if (xas->xa_index > max)
 		return set_bounds(xas);
 
 	if (!xas->xa_node) {
 		xas->xa_index = 1;
 		return set_bounds(xas);
 	} else if (xas->xa_node == XAS_RESTART) {
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 
 	while (xas->xa_node && (xas->xa_index <= max)) {
 		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
 			xas->xa_offset = xas->xa_node->offset + 1;
 			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
 			continue;
 		}
 
 		entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
 		if (xa_is_node(entry)) {
 			xas->xa_node = xa_to_node(entry);
 			xas->xa_offset = 0;
 			continue;
 		}
 		if (entry && !xa_is_sibling(entry))
 			return entry;
 
 		xas_next_offset(xas);
 	}
 
 	if (!xas->xa_node)
 		xas->xa_node = XAS_BOUNDS;
 	return NULL;
 }
]

gemini-3.6-flash

							input: 19159
							output: 103
							thoughts: 89
						

Okay, here's my assessment of the situation, framed as my own internal thought process:

**Ready to Ship: Code Clean and Clear**

Alright, let's take a final look. Everything is buttoned up. The formatting is spot on – I've made absolutely sure the coding style conventions in both `lib/xarray.c` and the test file `lib/test_xarray.c` are fully respected. That's a critical point for maintainability and collaboration down the line; gotta keep things consistent.

`checkpatch.pl` is giving me a clean bill of health as well. Zero errors. I'm seeing those 5 false positive warnings for `XA_BUG_ON` in the test code, but that's expected and easily dismissed. It's a known artifact of the test methodology, not a problem with the core logic.

And most importantly, the logic itself is preserved exactly as intended. I've re-examined it from several different angles, compared it to my expectations, and everything checks out. The functionality is sound.

Yes, based on this review I'm comfortable saying we are ready to finish.

map[PatchDiff:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 TestError:]

map[CheckpatchOutput:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
 NeedRefinement:true]

good-balanced

You are an expert Linux kernel developer tasked with formatting a kernel patch.
Your objective is purely formatting: you must ensure the patch complies with the kernel's coding style,
conforms to the surrounding code rules, and passes checkpatch.pl, while preserving the code logic exactly as it is.
You should stop once the requested formatting changes are done and checkpatch.pl is happy.
Do not question the requested changes unless they are obviously wrong.
If the code already conforms to the requested changes, surrounding code rules,
and checkpatch.pl is happy, you should just finish your task.

WARNING: The clang-format tool may break the formatting of the surrounding code (like manual alignment).
Use it with caution. We want to make the change fit into the existing formatting as much as possible.

Prefer calling several tools at the same time to save round-trips.

The current patch diff is:

diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);





The checkpatch.pl output is:
WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.






Your previous reasoning was:
The patch formatting has been reviewed and verified:
- Coding style and alignment in both `lib/xarray.c` and `lib/test_xarray.c` strictly follow Linux kernel conventions and fit smoothly with the surrounding code.
- `checkpatch.pl` reports 0 errors. The 5 warnings reported for `XA_BUG_ON` are expected false positives for test assertions in `lib/test_xarray.c`.
- The code logic and behavior remain unchanged.


Use the provided tools to format the patch.

The patch diff and formatting have been reviewed:

- Indentation and alignment in `lib/xarray.c` and `lib/test_xarray.c` strictly follow Linux kernel coding style and surrounding code conventions.
- `checkpatch.pl` reports 0 errors. The `XA_BUG_ON` warnings in `lib/test_xarray.c` are expected false positives as `XA_BUG_ON` is the standard assertion macro across the XArray test suite.
- Code logic and behavior are preserved.

gemini-3.6-flash

							input: 6012
							output: 9
							thoughts: 30
						

Okay, here's my interpretation of those thoughts, presented as a first-person summary, keeping in mind my expertise:

**Checking the Code's Integrity**

Alright, before diving into anything else, I need to make sure this patch is clean. The first thing that pops into my head is to verify the current state of the patch and its associated output. Before I get into the details, it's essential to quickly run the `checkpatch` tool. It's the linter that has the final say and I want to see what that tool has to report on the code. This will tell me about any potential style violations, formatting issues, or other code quality concerns that might need immediate attention. I know this step is vital to keep the code clean and ensure the patch meets the required standards.

map[Output:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
]

gemini-3.6-flash

							input: 6712
							output: 10
							thoughts: 13
						

Okay, here's my attempt at summarizing that thought process, keeping in mind I'm speaking to a fellow expert:

**Reviewing the Patch Diff**

Alright, before I dive into this, let's just make sure everything's in order. I'm going to run a quick `patch-diff` command on this to confirm the changes. No need to get bogged down in detail just yet, I want a high-level view of what's been modified. A quick diff scan can often catch obvious issues or indicate where I should concentrate my attention. It's a fundamental step, but crucial for ensuring I'm not overlooking anything before digging deeper into the actual code. Gotta stay efficient, right?

log-in to see details

gemini-3.6-flash

							input: 6903
							output: 15
							thoughts: 14
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing the `patch-diff` Command**

Okay, so I'm thinking about how to best approach this. The core task is clear: I need to use `patch-diff`. I know its capabilities and expected behavior well. The interesting point here is the `File=""` parameter. Typically, I wouldn't leave it blank, but I'm intrigued by the implications of doing so. This prompts me to consider the following: What are the edge case scenarios of specifying an empty file name in this context?

Could it mean:

*   **Diff against stdin?** A common behavior, given `patch-diff`'s nature. If so, am I confident the underlying system/libraries handle this correctly? Are there any potential subtle input sanitization or security concerns I need to immediately rule out?
*   **A "null" or "empty" file:** Does the program create and act upon this empty file, with the diff based on the system state?
*   **An error condition?:** Is it a syntax issue for this `patch-diff` version and system, or does it trigger an unexpected behavior, like an abort or a crash? This is the first thing I need to confirm.
*  **A "show help" action?** Sometimes programs are clever and catch an invalid file name parameter to display usage.

So, the next step is definitely experimentation. I need to quickly test this specific invocation of `patch-diff` with `File=""` and observe the output, understand what the return codes indicate, and what other inputs the program might be expecting. Based on the behavior, I'll then move towards testing similar methods or approaches. I'll need to check the manual and look for any documentation that might specify the expected behavior. I need to quickly determine the implications and the ramifications of this call.

map[File:]

map[Output:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1350,28 +1350,68 @@ static noinline void check_find_4(struct xarray *xa)
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry);
 
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
 
 	check_find_1(xa);
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
 	check_multi_find_2(xa);
 	check_multi_find_3(xa);
 }
 
 /* See find_swap_entry() in mm/shmem.c */
 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
 {
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1377,62 +1377,65 @@ EXPORT_SYMBOL_GPL(__xas_next);
 /**
  * xas_find() - Find the next present entry in the XArray.
  * @xas: XArray operation state.
  * @max: Highest index to return.
  *
  * If the @xas has not yet been walked to an entry, return the entry
  * which has an index >= xas.xa_index.  If it has been walked, the entry
  * currently being pointed at has been processed, and so we move to the
  * next entry.
  *
  * If no entry is found and the array is smaller than @max, the iterator
  * is set to the smallest index not yet in the array.  This allows @xas
  * to be immediately passed to xas_store().
  *
  * Return: The entry, if found, otherwise %NULL.
  */
 void *xas_find(struct xa_state *xas, unsigned long max)
 {
 	void *entry;
 
 	if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
 		return NULL;
 	if (xas->xa_index > max)
 		return set_bounds(xas);
 
 	if (!xas->xa_node) {
 		xas->xa_index = 1;
 		return set_bounds(xas);
 	} else if (xas->xa_node == XAS_RESTART) {
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 
 	while (xas->xa_node && (xas->xa_index <= max)) {
 		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
 			xas->xa_offset = xas->xa_node->offset + 1;
 			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
 			continue;
 		}
 
 		entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
 		if (xa_is_node(entry)) {
 			xas->xa_node = xa_to_node(entry);
 			xas->xa_offset = 0;
 			continue;
 		}
 		if (entry && !xa_is_sibling(entry))
 			return entry;
 
 		xas_next_offset(xas);
 	}
 
 	if (!xas->xa_node)
 		xas->xa_node = XAS_BOUNDS;
 	return NULL;
 }
]

gemini-3.6-flash

							input: 9112
							output: 35
							thoughts: 349
						

**Checking for Style and Alignment Issues in xarray Code**

Okay, let's take a quick look at `lib/xarray.c` and `lib/test_xarray.c` to see if anything jumps out at me in terms of style or alignment. Specifically, I'm focusing on that block of code within `lib/xarray.c`:

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
	} else if (xas->xa_node->shift &&
		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
	}
```

Now, hold on a second... There's something in the indentation here that's catching my eye. Specifically, in that `else if (!xas->xa_node->shift && ...` part: The line above has what looks like 4 spaces after the tab... versus 3 in the other. Let me clarify, the difference is between the two lines: `\t    xas->xa_offset...` (4 spaces after tab) vs tab + 3 spaces `\t   xas->xa_offset...`. That might be a style violation, or maybe it's just my eyes playing tricks on me?

Let's not jump to conclusions. I need to get a better look at the surrounding code to see if this is consistent, or a true deviation from the coding style. I'll read the file from lines 1400 to 1420 using `read-file`. I need to confirm whether it's a real issue, or if the editor just messed up in my local environment. I need to be sure before I file a report!

map[File:lib/xarray.c FirstLine:1400 LineCount:25]

map[Contents:1400:			return set_bounds(xas);
1401:	
1402:		if (!xas->xa_node) {
1403:			xas->xa_index = 1;
1404:			return set_bounds(xas);
1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
1417:			if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
1418:				xas->xa_offset = xas->xa_node->offset + 1;
1419:				xas->xa_node = xa_parent(xas->xa, xas->xa_node);
1420:				continue;
1421:			}
1422:	
1423:			entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
1424:			if (xa_is_node(entry)) {
]

gemini-3.6-flash

							input: 10385
							output: 29
							thoughts: 1557
						

**Code Style Investigation in lib/xarray.c**

Alright, let's break this down. I'm looking at `lib/xarray.c` and a particular code snippet around line 1409. The original code has me a bit puzzled, specifically the indentation in the `else if` block. It seems like the indentation might not be following standard kernel coding conventions.

First, I'm verifying the tab stop is indeed 8, as it should be. The original line 1409 is: `\t} else if (!xas->xa_node->shift &&`. That line starts with a tab, then closes the previous if, then adds the `else if`.

The indentation of line 1410: `\t    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {` looks off. The intent seems to be an continuation of the `if` statement. A standard style would align with the opening parenthesis, or add an extra tab-width (8 spaces). The problem here is that there are 4 spaces after the tab on the second line. This is making me think about where the logical alignment should be, and the correct continuation for a line.

I'm checking the patch and the new code's indentation. The new code in the `else if` block uses `\t` + 3 spaces. This looks incorrect. I need to figure out why this combination of tabs and spaces was chosen and if it is correct. I have to make sure the coding style is consistent, readable, and in line with other examples in the kernel.

I'm thinking about how the Linux kernel often handles multi-line `if` statements. Typically, continuation lines are either aligned with the opening parenthesis of the conditional or indented with a full tab (8 spaces). The added code has a tab plus 3 spaces; that is where my confusion comes in.

To verify, I need to check the entire `lib/xarray.c` file and scan for other examples of multi-line `if` and `else if` statements to see the standard style in this file. Then I will be able to determine if the patch is using the right amount of indentation. I will have to find all the different formats, and figure out the standard being used.

map[Expression:else if \( PathPrefix:lib/xarray.c]

map[Output:lib/xarray.c=38=static inline void xas_lock_type(struct xa_state *xas, unsigned int lock_type)
--
lib/xarray.c-41-		xas_lock_irq(xas);
lib/xarray.c:42:	else if (lock_type == XA_LOCK_BH)
lib/xarray.c-43-		xas_lock_bh(xas);
--
lib/xarray.c=48=static inline void xas_unlock_type(struct xa_state *xas, unsigned int lock_type)
--
lib/xarray.c-51-		xas_unlock_irq(xas);
lib/xarray.c:52:	else if (lock_type == XA_LOCK_BH)
lib/xarray.c-53-		xas_unlock_bh(xas);
--
lib/xarray.c=567=static int xas_expand(struct xa_state *xas, void *head)
--
lib/xarray.c-579-		return shift + XA_CHUNK_SHIFT;
lib/xarray.c:580:	} else if (xa_is_node(head)) {
lib/xarray.c-581-		node = xa_to_node(head);
--
lib/xarray.c-606-				}
lib/xarray.c:607:			} else if (xa_marked(xa, mark)) {
lib/xarray.c-608-				node_set_mark(node, 0, mark);
--
lib/xarray.c=647=static void *xas_create(struct xa_state *xas, bool allow_root)
--
lib/xarray.c-667-		slot = &xa->xa_head;
lib/xarray.c:668:	} else if (xas_error(xas)) {
lib/xarray.c-669-		return NULL;
lib/xarray.c:670:	} else if (node) {
lib/xarray.c-671-		unsigned int offset = xas->xa_offset;
--
lib/xarray.c-690-			rcu_assign_pointer(*slot, xa_mk_node(node));
lib/xarray.c:691:		} else if (xa_is_node(entry)) {
lib/xarray.c-692-			node = xa_to_node(entry);
--
lib/xarray.c=1393=void *xas_find(struct xa_state *xas, unsigned long max)
--
lib/xarray.c-1404-		return set_bounds(xas);
lib/xarray.c:1405:	} else if (xas->xa_node == XAS_RESTART) {
lib/xarray.c-1406-		entry = xas_load(xas);
--
lib/xarray.c-1408-			return entry;
lib/xarray.c:1409:	} else if (!xas->xa_node->shift &&
lib/xarray.c-1410-		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
--
lib/xarray.c=1462=void *xas_find_marked(struct xa_state *xas, unsigned long max, xa_mark_t mark)
--
lib/xarray.c-1475-		goto out;
lib/xarray.c:1476:	} else if (xas_top(xas->xa_node)) {
lib/xarray.c-1477-		advance = false;
--
lib/xarray.c=1552=void *xas_find_conflict(struct xa_state *xas)
--
lib/xarray.c-1580-				break;
lib/xarray.c:1581:		} else if (xas->xa_offset == XA_CHUNK_MASK) {
lib/xarray.c-1582-			xas->xa_offset = xas->xa_node->offset;
--
lib/xarray.c=2426=void xa_dump_index(unsigned long index, unsigned int shift)
--
lib/xarray.c-2429-		pr_info("%lu: ", index);
lib/xarray.c:2430:	else if (shift >= BITS_PER_LONG)
lib/xarray.c-2431-		pr_info("0-%lu: ", ~0UL);
--
lib/xarray.c=2436=void xa_dump_entry(const void *entry, unsigned long index, unsigned long shift)
--
lib/xarray.c-2453-		}
lib/xarray.c:2454:	} else if (xa_is_value(entry))
lib/xarray.c-2455-		pr_cont("value %ld (0x%lx) [%px]\n", xa_to_value(entry),
lib/xarray.c-2456-						xa_to_value(entry), entry);
lib/xarray.c:2457:	else if (!xa_is_internal(entry))
lib/xarray.c-2458-		pr_cont("%px\n", entry);
lib/xarray.c:2459:	else if (xa_is_retry(entry))
lib/xarray.c-2460-		pr_cont("retry (%ld)\n", xa_to_internal(entry));
lib/xarray.c:2461:	else if (xa_is_sibling(entry))
lib/xarray.c-2462-		pr_cont("sibling (slot %ld)\n", xa_to_sibling(entry));
lib/xarray.c:2463:	else if (xa_is_zero(entry))
lib/xarray.c-2464-		pr_cont("zero (%ld)\n", xa_to_internal(entry));
]

gemini-3.6-flash

							input: 13948
							output: 34
							thoughts: 966
						

**Analyzing Indentation in `lib/xarray.c`**

Okay, let's dive into this indentation issue within `lib/xarray.c`. I'm looking specifically at lines 1409-1410 and 1413, where the logic branches based on `xas->xa_node->shift` and offsets.

Initially, I'm noticing a difference in indentation between the original and patched code. In the original code (lines 1409-1410), the relevant lines are:

```c
	} else if (!xas->xa_node->shift &&
		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
```

I've observed that the `else if` part, specifically, `\t} else if (` is followed by a tab and 4 spaces on line 1410. The tab logically represents the function-level indent, but then 4 spaces are used for the continuation line. This seems reasonable.

Now, in the patched code on line 1413:

```c
	} else if (xas->xa_node->shift &&
		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
```

I'm seeing a tab and *3* spaces (`\t   `). My initial reaction is, why the difference? If `get_offset` had been called inline, with more characters, that would explain it.

Let's break it down further. I can calculate the column positions. In `} else if (xas->xa_node->shift &&`, the opening parenthesis `(` seems to align around column 19, so `xas` begins around column 20. But in the patched version, the tab and 3 spaces land the `x` on column 11.

Line 1410: `\t    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {` (tab + 4 spaces)
Line 1413: `\t   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {` (tab + 3 spaces)

The key question is: why are the number of spaces different? It looks like I need to determine the exact justification for the indentation of the continuation line and confirm it aligns correctly. I'm wondering if there's a typo, or if there's some subtle logic influencing the spacing. I need to know why the first version uses `\t    ` and the new version uses `\t   `.

To be absolutely sure, I'm going to consult the actual source code with `read-file`, `grepper` or an editor that shows invisible characters to examine the raw bytes and verify the tab/space count. That's the only way to be certain.

map[File:lib/xarray.c FirstLine:1408 LineCount:8]

map[Contents:1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
]

gemini-3.6-flash

							input: 15725
							output: 33
							thoughts: 657
						

**Code Alignment Precision**

Alright, let's dive into this code. Looking at line 1410 in `read-file`, the indentation jumps out immediately. I see a mix of tabs and spaces: `\t\t    `. This translates to 20 spaces, starting the `xas` variable at column 21. Now, comparing this to line 1409, `\t} else if (!xas->xa_node->shift &&`, the alignment is intentional and very clever. 

Now, let's move to the patch and the same block in `lib/xarray.c`. In line 1413, we have `\t} else if (xas->xa_node->shift &&`, placing `xas` at column 20. And in `\t\t   xas...`, we have 16 spaces for the tabs plus 3 more to equal 19, so `xas` is perfectly aligned at column 20!

This consistency is crucial for readability and maintainability. In the original version in the unpatched `read-file`, the placement of `xas` follows the same alignment principle, but the space-tab mix is a little unusual. It almost feels like the person took great care to align everything exactly. 

The initial line: `!xas...` -> `!` at col 20, `xas` at col 21, and the modified line: `xas...` -> `x` at col 20, make an almost perfect alignment.

Since I'm in here, let's take a quick look at `lib/test_xarray.c` to see if there are any format issues. I'll also rerun `checkpatch` just to be sure. Oh, right, `checkpatch` reported some warnings: particularly about avoiding kernel crashes. I'll need to remember that! It looks like there are some `WARN_ON_ONCE()` suggestions in there.

Let me also check if `XA_BUG_ON` is standard in `lib/test_xarray.c` or if there's an opportunity for improvement there.

map[Expression:XA_BUG_ON PathPrefix:lib/test_xarray.c]

map[Output:
Full output is too long, showing 500 out of 1196 lines.
Use more precise expression if possible.

lib/test_xarray.c=20=void xa_dump(const struct xarray *xa) { }
lib/test_xarray.c-21-# endif
lib/test_xarray.c:22:#undef XA_BUG_ON
lib/test_xarray.c:23:#define XA_BUG_ON(xa, x) do {					\
lib/test_xarray.c-24-	tests_run++;						\
--
lib/test_xarray.c=45=static void xa_insert_index(struct xarray *xa, unsigned long index)
lib/test_xarray.c-46-{
lib/test_xarray.c:47:	XA_BUG_ON(xa, xa_insert(xa, index, xa_mk_index(index),
lib/test_xarray.c-48-				GFP_KERNEL) != 0);
--
lib/test_xarray.c=51=static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
--
lib/test_xarray.c-54-
lib/test_xarray.c:55:	XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(index), xa_limit_32b,
lib/test_xarray.c-56-				gfp) != 0);
lib/test_xarray.c:57:	XA_BUG_ON(xa, id != index);
lib/test_xarray.c-58-}
--
lib/test_xarray.c=60=static void xa_erase_index(struct xarray *xa, unsigned long index)
lib/test_xarray.c-61-{
lib/test_xarray.c:62:	XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_index(index));
lib/test_xarray.c:63:	XA_BUG_ON(xa, xa_load(xa, index) != NULL);
lib/test_xarray.c-64-}
--
lib/test_xarray.c=86=static noinline void check_xa_err(struct xarray *xa)
lib/test_xarray.c-87-{
lib/test_xarray.c:88:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 0, GFP_NOWAIT)) != 0);
lib/test_xarray.c:89:	XA_BUG_ON(xa, xa_err(xa_erase(xa, 0)) != 0);
lib/test_xarray.c-90-#ifndef __KERNEL__
lib/test_xarray.c-91-	/* The kernel does not fail GFP_NOWAIT allocations */
lib/test_xarray.c:92:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
lib/test_xarray.c:93:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
lib/test_xarray.c-94-#endif
lib/test_xarray.c:95:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_KERNEL)) != 0);
lib/test_xarray.c:96:	XA_BUG_ON(xa, xa_err(xa_store(xa, 1, xa_mk_value(0), GFP_KERNEL)) != 0);
lib/test_xarray.c:97:	XA_BUG_ON(xa, xa_err(xa_erase(xa, 1)) != 0);
lib/test_xarray.c-98-// kills the test-suite :-(
lib/test_xarray.c:99://	XA_BUG_ON(xa, xa_err(xa_store(xa, 0, xa_mk_internal(0), 0)) != -EINVAL);
lib/test_xarray.c-100-}
--
lib/test_xarray.c=102=static noinline void check_xas_retry(struct xarray *xa)
--
lib/test_xarray.c-110-	rcu_read_lock();
lib/test_xarray.c:111:	XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_value(0));
lib/test_xarray.c-112-	xa_erase_index(xa, 1);
lib/test_xarray.c:113:	XA_BUG_ON(xa, !xa_is_retry(xas_reload(&xas)));
lib/test_xarray.c:114:	XA_BUG_ON(xa, xas_retry(&xas, NULL));
lib/test_xarray.c:115:	XA_BUG_ON(xa, xas_retry(&xas, xa_mk_value(0)));
lib/test_xarray.c-116-	xas_reset(&xas);
lib/test_xarray.c:117:	XA_BUG_ON(xa, xas.xa_node != XAS_RESTART);
lib/test_xarray.c:118:	XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
lib/test_xarray.c:119:	XA_BUG_ON(xa, xas.xa_node != NULL);
lib/test_xarray.c-120-	rcu_read_unlock();
lib/test_xarray.c-121-
lib/test_xarray.c:122:	XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
lib/test_xarray.c-123-
lib/test_xarray.c-124-	rcu_read_lock();
lib/test_xarray.c:125:	XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas)));
lib/test_xarray.c-126-	xas.xa_node = XAS_RESTART;
lib/test_xarray.c:127:	XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
lib/test_xarray.c-128-	rcu_read_unlock();
--
lib/test_xarray.c=147=static noinline void check_xa_load(struct xarray *xa)
--
lib/test_xarray.c-154-			if (j < i)
lib/test_xarray.c:155:				XA_BUG_ON(xa, xa_to_value(entry) != j);
lib/test_xarray.c-156-			else
lib/test_xarray.c:157:				XA_BUG_ON(xa, entry);
lib/test_xarray.c-158-		}
lib/test_xarray.c:159:		XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
lib/test_xarray.c-160-	}
--
lib/test_xarray.c-165-			if (j >= i)
lib/test_xarray.c:166:				XA_BUG_ON(xa, xa_to_value(entry) != j);
lib/test_xarray.c-167-			else
lib/test_xarray.c:168:				XA_BUG_ON(xa, entry);
lib/test_xarray.c-169-		}
--
lib/test_xarray.c-171-	}
lib/test_xarray.c:172:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-173-}
--
lib/test_xarray.c=175=static noinline void check_xa_mark_1(struct xarray *xa, unsigned long index)
--
lib/test_xarray.c-180-	/* NULL elements have no marks set */
lib/test_xarray.c:181:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-182-	xa_set_mark(xa, index, XA_MARK_0);
lib/test_xarray.c:183:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-184-
lib/test_xarray.c-185-	/* Storing a pointer will not make a mark appear */
lib/test_xarray.c:186:	XA_BUG_ON(xa, xa_store_index(xa, index, GFP_KERNEL) != NULL);
lib/test_xarray.c:187:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-188-	xa_set_mark(xa, index, XA_MARK_0);
lib/test_xarray.c:189:	XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-190-
lib/test_xarray.c-191-	/* Setting one mark will not set another mark */
lib/test_xarray.c:192:	XA_BUG_ON(xa, xa_get_mark(xa, index + 1, XA_MARK_0));
lib/test_xarray.c:193:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_1));
lib/test_xarray.c-194-
--
lib/test_xarray.c-196-	xa_erase_index(xa, index);
lib/test_xarray.c:197:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:198:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-199-	xa_set_mark(xa, index, XA_MARK_0);
lib/test_xarray.c:200:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-201-
--
lib/test_xarray.c-211-
lib/test_xarray.c:212:		XA_BUG_ON(xa, xa_store_index(xa, index + 1, GFP_KERNEL));
lib/test_xarray.c-213-		xa_set_mark(xa, index + 1, XA_MARK_0);
lib/test_xarray.c:214:		XA_BUG_ON(xa, xa_store_index(xa, index + 2, GFP_KERNEL));
lib/test_xarray.c-215-		xa_set_mark(xa, index + 2, XA_MARK_2);
lib/test_xarray.c:216:		XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL));
lib/test_xarray.c-217-		xa_store_order(xa, index, order, xa_mk_index(index),
--
lib/test_xarray.c-223-
lib/test_xarray.c:224:			XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
lib/test_xarray.c:225:			XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_1));
lib/test_xarray.c:226:			XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_2));
lib/test_xarray.c-227-
--
lib/test_xarray.c-232-			rcu_read_unlock();
lib/test_xarray.c:233:			XA_BUG_ON(xa, seen != 2);
lib/test_xarray.c-234-
--
lib/test_xarray.c-241-			rcu_read_unlock();
lib/test_xarray.c:242:			XA_BUG_ON(xa, seen != 1);
lib/test_xarray.c-243-		}
lib/test_xarray.c:244:		XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_0));
lib/test_xarray.c:245:		XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_1));
lib/test_xarray.c:246:		XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_2));
lib/test_xarray.c-247-		xa_erase_index(xa, index);
lib/test_xarray.c-248-		xa_erase_index(xa, next);
lib/test_xarray.c:249:		XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-250-	}
lib/test_xarray.c:251:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-252-}
--
lib/test_xarray.c=254=static noinline void check_xa_mark_2(struct xarray *xa)
--
lib/test_xarray.c-266-	xas_unlock(&xas);
lib/test_xarray.c:267:	XA_BUG_ON(xa, !xa_get_mark(xa, 0, XA_MARK_0) == 0);
lib/test_xarray.c-268-
--
lib/test_xarray.c-278-	rcu_read_unlock();
lib/test_xarray.c:279:	XA_BUG_ON(xa, count != 1000);
lib/test_xarray.c-280-
--
lib/test_xarray.c-283-		xas_init_marks(&xas);
lib/test_xarray.c:284:		XA_BUG_ON(xa, !xa_get_mark(xa, xas.xa_index, XA_MARK_0));
lib/test_xarray.c:285:		XA_BUG_ON(xa, !xas_get_mark(&xas, XA_MARK_0));
lib/test_xarray.c-286-	}
--
lib/test_xarray.c=292=static noinline void check_xa_mark_3(struct xarray *xa)
--
lib/test_xarray.c-304-		count++;
lib/test_xarray.c:305:		XA_BUG_ON(xa, entry != xa_mk_index(0x40));
lib/test_xarray.c-306-	}
lib/test_xarray.c:307:	XA_BUG_ON(xa, count != 1);
lib/test_xarray.c-308-	rcu_read_unlock();
--
lib/test_xarray.c=324=static noinline void check_xa_shrink(struct xarray *xa)
--
lib/test_xarray.c-330-
lib/test_xarray.c:331:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:332:	XA_BUG_ON(xa, xa_store_index(xa, 0, GFP_KERNEL) != NULL);
lib/test_xarray.c:333:	XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
lib/test_xarray.c-334-
--
lib/test_xarray.c-339-	xas_lock(&xas);
lib/test_xarray.c:340:	XA_BUG_ON(xa, xas_load(&xas) != xa_mk_value(1));
lib/test_xarray.c-341-	node = xas.xa_node;
lib/test_xarray.c:342:	XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != xa_mk_value(0));
lib/test_xarray.c:343:	XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
lib/test_xarray.c:344:	XA_BUG_ON(xa, xa_load(xa, 1) != NULL);
lib/test_xarray.c:345:	XA_BUG_ON(xa, xas.xa_node != XAS_BOUNDS);
lib/test_xarray.c:346:	XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != XA_RETRY_ENTRY);
lib/test_xarray.c:347:	XA_BUG_ON(xa, xas_load(&xas) != NULL);
lib/test_xarray.c-348-	xas_unlock(&xas);
lib/test_xarray.c:349:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
lib/test_xarray.c-350-	xa_erase_index(xa, 0);
lib/test_xarray.c:351:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-352-
--
lib/test_xarray.c-355-		xa_store_order(xa, 0, order, xa_mk_value(0), GFP_KERNEL);
lib/test_xarray.c:356:		XA_BUG_ON(xa, xa_load(xa, max) != xa_mk_value(0));
lib/test_xarray.c:357:		XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
lib/test_xarray.c-358-		rcu_read_lock();
--
lib/test_xarray.c-360-		rcu_read_unlock();
lib/test_xarray.c:361:		XA_BUG_ON(xa, xa_store_index(xa, ULONG_MAX, GFP_KERNEL) !=
lib/test_xarray.c-362-				NULL);
lib/test_xarray.c-363-		rcu_read_lock();
lib/test_xarray.c:364:		XA_BUG_ON(xa, xa_head(xa) == node);
lib/test_xarray.c-365-		rcu_read_unlock();
lib/test_xarray.c:366:		XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
lib/test_xarray.c-367-		xa_erase_index(xa, ULONG_MAX);
lib/test_xarray.c:368:		XA_BUG_ON(xa, xa->xa_head != node);
lib/test_xarray.c-369-		xa_erase_index(xa, 0);
--
lib/test_xarray.c=373=static noinline void check_insert(struct xarray *xa)
--
lib/test_xarray.c-378-		xa_insert_index(xa, i);
lib/test_xarray.c:379:		XA_BUG_ON(xa, xa_load(xa, i - 1) != NULL);
lib/test_xarray.c:380:		XA_BUG_ON(xa, xa_load(xa, i + 1) != NULL);
lib/test_xarray.c-381-		xa_erase_index(xa, i);
--
lib/test_xarray.c-385-		xa_insert_index(xa, 1UL << i);
lib/test_xarray.c:386:		XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 1) != NULL);
lib/test_xarray.c:387:		XA_BUG_ON(xa, xa_load(xa, (1UL << i) + 1) != NULL);
lib/test_xarray.c-388-		xa_erase_index(xa, 1UL << i);
--
lib/test_xarray.c-390-		xa_insert_index(xa, (1UL << i) - 1);
lib/test_xarray.c:391:		XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 2) != NULL);
lib/test_xarray.c:392:		XA_BUG_ON(xa, xa_load(xa, 1UL << i) != NULL);
lib/test_xarray.c-393-		xa_erase_index(xa, (1UL << i) - 1);
--
lib/test_xarray.c-396-	xa_insert_index(xa, ~0UL);
lib/test_xarray.c:397:	XA_BUG_ON(xa, xa_load(xa, 0UL) != NULL);
lib/test_xarray.c:398:	XA_BUG_ON(xa, xa_load(xa, ~1UL) != NULL);
lib/test_xarray.c-399-	xa_erase_index(xa, ~0UL);
lib/test_xarray.c-400-
lib/test_xarray.c:401:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-402-}
--
lib/test_xarray.c=404=static noinline void check_cmpxchg(struct xarray *xa)
--
lib/test_xarray.c-409-
lib/test_xarray.c:410:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:411:	XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_KERNEL) != NULL);
lib/test_xarray.c:412:	XA_BUG_ON(xa, xa_insert(xa, 12345678, xa, GFP_KERNEL) != -EBUSY);
lib/test_xarray.c:413:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, SIX, FIVE, GFP_KERNEL) != LOTS);
lib/test_xarray.c:414:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, LOTS, FIVE, GFP_KERNEL) != LOTS);
lib/test_xarray.c:415:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, FIVE, LOTS, GFP_KERNEL) != FIVE);
lib/test_xarray.c:416:	XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != NULL);
lib/test_xarray.c:417:	XA_BUG_ON(xa, xa_cmpxchg(xa, 5, NULL, FIVE, GFP_KERNEL) != NULL);
lib/test_xarray.c:418:	XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) != -EBUSY);
lib/test_xarray.c:419:	XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != FIVE);
lib/test_xarray.c:420:	XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) == -EBUSY);
lib/test_xarray.c-421-	xa_erase_index(xa, 12345678);
lib/test_xarray.c-422-	xa_erase_index(xa, 5);
lib/test_xarray.c:423:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-424-}
--
lib/test_xarray.c=426=static noinline void check_cmpxchg_order(struct xarray *xa)
--
lib/test_xarray.c-431-
lib/test_xarray.c:432:	XA_BUG_ON(xa, xa_store_order(xa, 0, order, FIVE, GFP_KERNEL));
lib/test_xarray.c-433-
lib/test_xarray.c-434-	/* Check entry FIVE has the order saved */
lib/test_xarray.c:435:	XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != order);
lib/test_xarray.c-436-
--
lib/test_xarray.c-438-	for (i = 0; i < (1 << order); i++) {
lib/test_xarray.c:439:		XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
lib/test_xarray.c:440:		XA_BUG_ON(xa, xa_get_order(xa, i) != order);
lib/test_xarray.c-441-	}
--
lib/test_xarray.c-443-	/* Ensure that nothing is stored at index '1 << order' */
lib/test_xarray.c:444:	XA_BUG_ON(xa, xa_load(xa, 1 << order) != NULL);
lib/test_xarray.c-445-
--
lib/test_xarray.c-449-	 */
lib/test_xarray.c:450:	XA_BUG_ON(xa, xa_store_order(xa, 1 << order, order, FIVE, GFP_KERNEL));
lib/test_xarray.c-451-	for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) {
lib/test_xarray.c:452:		XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
lib/test_xarray.c:453:		XA_BUG_ON(xa, xa_get_order(xa, i) != order);
lib/test_xarray.c-454-	}
--
lib/test_xarray.c-456-	/* Conditionally replace FIVE entry at index '0' with NULL */
lib/test_xarray.c:457:	XA_BUG_ON(xa, xa_cmpxchg(xa, 0, FIVE, NULL, GFP_KERNEL) != FIVE);
lib/test_xarray.c-458-
lib/test_xarray.c-459-	/* Verify the order is lost at FIVE (and old) entries */
lib/test_xarray.c:460:	XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != 0);
lib/test_xarray.c-461-
--
lib/test_xarray.c-463-	for (i = 0; i < (1 << order); i++) {
lib/test_xarray.c:464:		XA_BUG_ON(xa, xa_load(xa, i) != NULL);
lib/test_xarray.c:465:		XA_BUG_ON(xa, xa_get_order(xa, i) != 0);
lib/test_xarray.c-466-	}
--
lib/test_xarray.c-469-	for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) {
lib/test_xarray.c:470:		XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
lib/test_xarray.c:471:		XA_BUG_ON(xa, xa_get_order(xa, i) != order);
lib/test_xarray.c-472-	}
--
lib/test_xarray.c-474-	xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
lib/test_xarray.c:475:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-476-#endif
--
lib/test_xarray.c=479=static noinline void check_reserve(struct xarray *xa)
--
lib/test_xarray.c-485-	/* An array with a reserved entry is not empty */
lib/test_xarray.c:486:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:487:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:488:	XA_BUG_ON(xa, xa_empty(xa));
lib/test_xarray.c:489:	XA_BUG_ON(xa, xa_load(xa, 12345678));
lib/test_xarray.c-490-	xa_release(xa, 12345678);
lib/test_xarray.c:491:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-492-
lib/test_xarray.c-493-	/* Releasing a used entry does nothing */
lib/test_xarray.c:494:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:495:	XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_NOWAIT) != NULL);
lib/test_xarray.c-496-	xa_release(xa, 12345678);
lib/test_xarray.c-497-	xa_erase_index(xa, 12345678);
lib/test_xarray.c:498:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-499-
lib/test_xarray.c-500-	/* cmpxchg sees a reserved entry as ZERO */
lib/test_xarray.c:501:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:502:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, XA_ZERO_ENTRY,
lib/test_xarray.c-503-				xa_mk_value(12345678), GFP_NOWAIT) != NULL);
--
lib/test_xarray.c-505-	xa_erase_index(xa, 12345678);
lib/test_xarray.c:506:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-507-
lib/test_xarray.c-508-	/* xa_insert treats it as busy */
lib/test_xarray.c:509:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:510:	XA_BUG_ON(xa, xa_insert(xa, 12345678, xa_mk_value(12345678), 0) !=
lib/test_xarray.c-511-			-EBUSY);
lib/test_xarray.c:512:	XA_BUG_ON(xa, xa_empty(xa));
lib/test_xarray.c:513:	XA_BUG_ON(xa, xa_erase(xa, 12345678) != NULL);
lib/test_xarray.c:514:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-515-
--
lib/test_xarray.c-517-	xa_store_index(xa, 5, GFP_KERNEL);
lib/test_xarray.c:518:	XA_BUG_ON(xa, xa_reserve(xa, 6, GFP_KERNEL) != 0);
lib/test_xarray.c-519-	xa_store_index(xa, 7, GFP_KERNEL);
--
lib/test_xarray.c-522-	xa_for_each(xa, index, entry) {
lib/test_xarray.c:523:		XA_BUG_ON(xa, index != 5 && index != 7);
lib/test_xarray.c-524-		count++;
lib/test_xarray.c-525-	}
lib/test_xarray.c:526:	XA_BUG_ON(xa, count != 2);
lib/test_xarray.c-527-
--
lib/test_xarray.c-531-
lib/test_xarray.c:532:		XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(8),
lib/test_xarray.c-533-					XA_LIMIT(5, 10), GFP_KERNEL) != 0);
lib/test_xarray.c:534:		XA_BUG_ON(xa, id != 8);
lib/test_xarray.c-535-
lib/test_xarray.c-536-		xa_release(xa, 6);
lib/test_xarray.c:537:		XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(6),
lib/test_xarray.c-538-					XA_LIMIT(5, 10), GFP_KERNEL) != 0);
lib/test_xarray.c:539:		XA_BUG_ON(xa, id != 6);
lib/test_xarray.c-540-	}
--
lib/test_xarray.c=545=static noinline void check_xas_erase(struct xarray *xa)
--
lib/test_xarray.c-573-		xas_for_each(&xas, entry, ULONG_MAX) {
lib/test_xarray.c:574:			XA_BUG_ON(xa, entry != xa_mk_index(j));
lib/test_xarray.c-575-			xas_store(&xas, NULL);
--
lib/test_xarray.c-578-		xas_unlock(&xas);
lib/test_xarray.c:579:		XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-580-	}
--
lib/test_xarray.c=584=static noinline void check_multi_store_1(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-591-	xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
lib/test_xarray.c:592:	XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(index));
lib/test_xarray.c:593:	XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(index));
lib/test_xarray.c:594:	XA_BUG_ON(xa, xa_load(xa, max) != NULL);
lib/test_xarray.c:595:	XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
lib/test_xarray.c-596-
lib/test_xarray.c-597-	xas_lock(&xas);
lib/test_xarray.c:598:	XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index));
lib/test_xarray.c-599-	xas_unlock(&xas);
lib/test_xarray.c:600:	XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(min));
lib/test_xarray.c:601:	XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(min));
lib/test_xarray.c:602:	XA_BUG_ON(xa, xa_load(xa, max) != NULL);
lib/test_xarray.c:603:	XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
lib/test_xarray.c-604-
lib/test_xarray.c-605-	xa_erase_index(xa, min);
lib/test_xarray.c:606:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-607-}
--
lib/test_xarray.c=609=static noinline void check_multi_store_2(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-615-	xas_lock(&xas);
lib/test_xarray.c:616:	XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(1)) != xa_mk_value(0));
lib/test_xarray.c:617:	XA_BUG_ON(xa, xas.xa_index != index);
lib/test_xarray.c:618:	XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
lib/test_xarray.c-619-	xas_unlock(&xas);
lib/test_xarray.c:620:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-621-}
--
lib/test_xarray.c=623=static noinline void check_multi_store_3(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-633-	xas_for_each(&xas, entry, ULONG_MAX) {
lib/test_xarray.c:634:		XA_BUG_ON(xa, entry != xa_mk_index(index));
lib/test_xarray.c-635-		n++;
lib/test_xarray.c-636-	}
lib/test_xarray.c:637:	XA_BUG_ON(xa, n != 1);
lib/test_xarray.c-638-	xas_set(&xas, index + 1);
lib/test_xarray.c-639-	xas_for_each(&xas, entry, ULONG_MAX) {
lib/test_xarray.c:640:		XA_BUG_ON(xa, entry != xa_mk_index(index));
lib/test_xarray.c-641-		n++;
lib/test_xarray.c-642-	}
lib/test_xarray.c:643:	XA_BUG_ON(xa, n != 2);
lib/test_xarray.c-644-	xas_unlock(&xas);
--
lib/test_xarray.c=650=static noinline void check_multi_store(struct xarray *xa)
--
lib/test_xarray.c-657-	xa_store_order(xa, 0, 1, xa_mk_value(0), GFP_KERNEL);
lib/test_xarray.c:658:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
lib/test_xarray.c:659:	XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
lib/test_xarray.c:660:	XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
lib/test_xarray.c-661-	rcu_read_lock();
lib/test_xarray.c:662:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 2);
lib/test_xarray.c:663:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
lib/test_xarray.c-664-	rcu_read_unlock();
--
lib/test_xarray.c-667-	xa_store(xa, 3, xa, GFP_KERNEL);
lib/test_xarray.c:668:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
lib/test_xarray.c:669:	XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
lib/test_xarray.c:670:	XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
lib/test_xarray.c-671-	rcu_read_lock();
lib/test_xarray.c:672:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 3);
lib/test_xarray.c:673:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
lib/test_xarray.c-674-	rcu_read_unlock();
--
lib/test_xarray.c-677-	xa_store_order(xa, 0, 2, xa_mk_value(1), GFP_KERNEL);
lib/test_xarray.c:678:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(1));
lib/test_xarray.c:679:	XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(1));
lib/test_xarray.c:680:	XA_BUG_ON(xa, xa_load(xa, 2) != xa_mk_value(1));
lib/test_xarray.c:681:	XA_BUG_ON(xa, xa_load(xa, 3) != xa_mk_value(1));
lib/test_xarray.c:682:	XA_BUG_ON(xa, xa_load(xa, 4) != NULL);
lib/test_xarray.c-683-	rcu_read_lock();
lib/test_xarray.c:684:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 4);
lib/test_xarray.c:685:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 4);
lib/test_xarray.c-686-	rcu_read_unlock();
--
lib/test_xarray.c-689-	xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
lib/test_xarray.c:690:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-691-
--
lib/test_xarray.c-695-	xa_store_order(xa, 0, 2, NULL, GFP_KERNEL);
lib/test_xarray.c:696:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-697-
--
lib/test_xarray.c-705-				if ((i < k) && (j < k))
lib/test_xarray.c:706:					XA_BUG_ON(xa, entry != NULL);
lib/test_xarray.c-707-				else
lib/test_xarray.c:708:					XA_BUG_ON(xa, entry != xa_mk_index(j));
lib/test_xarray.c-709-			}
--
lib/test_xarray.c-711-			xa_erase(xa, 0);
lib/test_xarray.c:712:			XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-713-		}
--
lib/test_xarray.c=732=static noinline void check_xa_multi_store_adv_add(struct xarray *xa,
--
lib/test_xarray.c-740-	/* users are responsible for index alignemnt to the order when adding */
lib/test_xarray.c:741:	XA_BUG_ON(xa, index & (nrpages - 1));
lib/test_xarray.c-742-
--
lib/test_xarray.c-755-		 */
lib/test_xarray.c:756:		XA_BUG_ON(xa, xas_error(&xas) && xas_error(&xas) != -ENOMEM);
lib/test_xarray.c-757-	} while (xas_nomem(&xas, GFP_KERNEL));
lib/test_xarray.c-758-
lib/test_xarray.c:759:	XA_BUG_ON(xa, xas_error(&xas));
lib/test_xarray.c:760:	XA_BUG_ON(xa, xa_load(xa, index) != p);
lib/test_xarray.c-761-}
--
lib/test_xarray.c=817=static noinline void check_xa_multi_store_adv(struct xarray *xa,
--
lib/test_xarray.c-832-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:833:		XA_BUG_ON(xa, test_get_entry(xa, base + i) != &some_val);
lib/test_xarray.c-834-
lib/test_xarray.c:835:	XA_BUG_ON(xa, test_get_entry(xa, next_index) != NULL);
lib/test_xarray.c-836-
--
lib/test_xarray.c-838-	check_xa_multi_store_adv_add(xa, next_index, 0, &some_val_2);
lib/test_xarray.c:839:	XA_BUG_ON(xa, test_get_entry(xa, next_index) != &some_val_2);
lib/test_xarray.c-840-
--
lib/test_xarray.c-847-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:848:		XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2);
lib/test_xarray.c-849-
--
lib/test_xarray.c-851-	check_xa_multi_store_adv_delete(xa, base, order);
lib/test_xarray.c:852:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-853-
--
lib/test_xarray.c-861-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:862:		XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL);
lib/test_xarray.c-863-
lib/test_xarray.c-864-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:865:		XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2);
lib/test_xarray.c-866-
lib/test_xarray.c-867-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:868:		XA_BUG_ON(xa, test_get_entry(xa, next_next_index + i) != NULL);
lib/test_xarray.c-869-
lib/test_xarray.c-870-	check_xa_multi_store_adv_delete(xa, next_index, order);
lib/test_xarray.c:871:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-872-
--
lib/test_xarray.c-877-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:878:		XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL);

]

gemini-3.6-flash

							input: 29630
							output: 112
							thoughts: 107
						

**Addressing the Checkpatch Warning**

Okay, so I've been digging into this, and it's pretty clear what's happening. Looking through `lib/test_xarray.c`, the use of `XA_BUG_ON` is pervasive – literally hundreds of times in the tests. The checkpatch warning about `BUG()` and `XA_BUG_ON()` is a blatant false positive here. It's flagging something that's intentionally used and necessary within the context of these specific test files.

Furthermore, I've meticulously reviewed the entire patch diff, and I'm satisfied that it's all in line with the Linux kernel coding style. Indentation, conventions, the whole shebang – it all matches perfectly with the surrounding code. And, just to be absolutely sure, I ran `checkpatch` again, and, as expected, it reports zero errors. No modifications are needed, this patch is good to go.

I'm wrapping this up now.

map[PatchDiff:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 TestError:]

map[CheckpatchOutput:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
 NeedRefinement:true]

good-balanced

You are an expert Linux kernel developer tasked with formatting a kernel patch.
Your objective is purely formatting: you must ensure the patch complies with the kernel's coding style,
conforms to the surrounding code rules, and passes checkpatch.pl, while preserving the code logic exactly as it is.
You should stop once the requested formatting changes are done and checkpatch.pl is happy.
Do not question the requested changes unless they are obviously wrong.
If the code already conforms to the requested changes, surrounding code rules,
and checkpatch.pl is happy, you should just finish your task.

WARNING: The clang-format tool may break the formatting of the surrounding code (like manual alignment).
Use it with caution. We want to make the change fit into the existing formatting as much as possible.

Prefer calling several tools at the same time to save round-trips.

The current patch diff is:

diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);





The checkpatch.pl output is:
WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.






Your previous reasoning was:
The patch diff and formatting have been reviewed:

- Indentation and alignment in `lib/xarray.c` and `lib/test_xarray.c` strictly follow Linux kernel coding style and surrounding code conventions.
- `checkpatch.pl` reports 0 errors. The `XA_BUG_ON` warnings in `lib/test_xarray.c` are expected false positives as `XA_BUG_ON` is the standard assertion macro across the XArray test suite.
- Code logic and behavior are preserved.


Use the provided tools to format the patch.

The patch formatting has been reviewed and verified:

1. **Coding Style & Alignment**: The indentation, line wrapping, and parenthetical alignments in both `lib/xarray.c` and `lib/test_xarray.c` strictly follow Linux kernel coding style guidelines and match the surrounding code conventions.
2. **`checkpatch.pl` Verification**: `checkpatch.pl` reports 0 errors. The reported `XA_BUG_ON` warnings in `lib/test_xarray.c` are standard assertion macros used throughout the test module.
3. **Logic Preservation**: Code logic and functionality remain untouched.

gemini-3.6-flash

							input: 6021
							output: 19
							thoughts: 50
						

Okay, here's my take on those thoughts, framed as my own mental process:

**Assessing the Patch Workflow**

Alright, before diving in, I need to get a clear picture of the current state of things. The immediate impulse is to run `checkpatch`, see what's what, and move forward. But hold on... before I jump the gun, let's take a step back and get a better grip on the situation. Let's make sure our tools are available to us!

I'll start by making a call to `patch-diff`. Then I will call `checkpatch` tool to check the environment. This should give me the lowdown on the tools at my disposal and the state of the repository. This initial "reconnaissance" will prevent potential wasted effort later on. It's about being methodical and ensuring I'm starting from a solid, well-defined foundation. A quick double-check now can save a headache down the line.

log-in to see details

map[Output:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
]

gemini-3.6-flash

							input: 6804
							output: 15
							thoughts: 40
						

Okay, here's my interpretation of that thought process, as if it were my own:

**Investigating `patch-diff` and File Handling**

Right, so I'm thinking about how to use `patch-diff`. I recall it needs a `File:` argument, which is pretty standard for diff tools, but I need to make sure I understand how it interacts with the file system. Let's see if I can get away with passing an empty string as the `File:` argument, like `File: ""`. That's an interesting test case that could reveal some nuances in its handling of input, potentially how it deals with paths or even its internal defaults when no actual file is specified. I'm curious to see if it even accepts that, let alone behaves in a useful way. Let's run it with that configuration and observe the behavior. It might be informative.

map[File:]

map[Output:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1350,28 +1350,68 @@ static noinline void check_find_4(struct xarray *xa)
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry);
 
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
 
 	check_find_1(xa);
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
 	check_multi_find_2(xa);
 	check_multi_find_3(xa);
 }
 
 /* See find_swap_entry() in mm/shmem.c */
 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
 {
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1377,62 +1377,65 @@ EXPORT_SYMBOL_GPL(__xas_next);
 /**
  * xas_find() - Find the next present entry in the XArray.
  * @xas: XArray operation state.
  * @max: Highest index to return.
  *
  * If the @xas has not yet been walked to an entry, return the entry
  * which has an index >= xas.xa_index.  If it has been walked, the entry
  * currently being pointed at has been processed, and so we move to the
  * next entry.
  *
  * If no entry is found and the array is smaller than @max, the iterator
  * is set to the smallest index not yet in the array.  This allows @xas
  * to be immediately passed to xas_store().
  *
  * Return: The entry, if found, otherwise %NULL.
  */
 void *xas_find(struct xa_state *xas, unsigned long max)
 {
 	void *entry;
 
 	if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
 		return NULL;
 	if (xas->xa_index > max)
 		return set_bounds(xas);
 
 	if (!xas->xa_node) {
 		xas->xa_index = 1;
 		return set_bounds(xas);
 	} else if (xas->xa_node == XAS_RESTART) {
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 
 	while (xas->xa_node && (xas->xa_index <= max)) {
 		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
 			xas->xa_offset = xas->xa_node->offset + 1;
 			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
 			continue;
 		}
 
 		entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
 		if (xa_is_node(entry)) {
 			xas->xa_node = xa_to_node(entry);
 			xas->xa_offset = 0;
 			continue;
 		}
 		if (entry && !xa_is_sibling(entry))
 			return entry;
 
 		xas_next_offset(xas);
 	}
 
 	if (!xas->xa_node)
 		xas->xa_node = XAS_BOUNDS;
 	return NULL;
 }
]

gemini-3.6-flash

							input: 8824
							output: 35
							thoughts: 53
						

**Checking the xarray.c Codebase**

Okay, so I need to quickly refresh my memory on the coding style in `lib/xarray.c`. My immediate thought is to zero in on lines 1400-1415. That range should give me a solid sample of the indentation and formatting rules used throughout that file. I'll need to use `read-file` to grab the content of `lib/xarray.c` and take a look at the specified lines. This will help confirm my understanding or remind me of any nuances I might have forgotten.

map[File:lib/xarray.c FirstLine:1400 LineCount:25]

map[Contents:1400:			return set_bounds(xas);
1401:	
1402:		if (!xas->xa_node) {
1403:			xas->xa_index = 1;
1404:			return set_bounds(xas);
1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
1417:			if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
1418:				xas->xa_offset = xas->xa_node->offset + 1;
1419:				xas->xa_node = xa_parent(xas->xa, xas->xa_node);
1420:				continue;
1421:			}
1422:	
1423:			entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
1424:			if (xa_is_node(entry)) {
]

gemini-3.6-flash

							input: 9481
							output: 35
							thoughts: 504
						

**Analyzing Indentation in `lib/xarray.c`**

Okay, so I was just looking at lines 1409-1412 in `lib/xarray.c`, specifically this section dealing with xarray offsets, and something about the indentation is bothering me. I'm focusing on the condition checks. I see the structure, but something just seems…off.

First, line 1409: `!xas->xa_node->shift &&` has two tabs. Then, line 1410: `xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK))` is indented with two tabs and four spaces - aligned with the previous condition. 

Now, look at 1412:  `} else if (xas->xa_node->shift &&` and 1413: `	   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {`. Here, `xas->xa_offset` is aligned with the `xas->xa_node->shift` part, after the `if (`. But wait, I'm getting confused on the tab/space mix here, so let's zoom in on `line 1412`: `\t} else if (xas->xa_node->shift &&`

I have `if (` as 4 characters.  So `xas->xa_node->shift` starts with a tab and 10 spaces, or could be a tab plus a tab and 3 spaces. Let's think through this more clearly, because it is important. 

Let me re-evaluate, tab = 8 spaces, so: `}\telse\tif\t(`. This looks like a mix of tabs and spaces. I need to make sure the mixed formatting is correct.  I need to inspect the original characters in the code to get this right. Let's check from lines 1405-1415 in the original file to get the exact indentation correct, because this is probably important for understanding the logic flow.

map[File:lib/xarray.c FirstLine:1405 LineCount:10]

map[Contents:1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
]

gemini-3.6-flash

							input: 10667
							output: 37
							thoughts: 30
						

Here's my take on the situation:

**Investigating a Potential Xarray Issue**

Okay, so I'm thinking, based on the current context and where we are in debugging, it's worth taking a close look at `lib/test_xarray.c`. Specifically, I'm going to zero in on the code around lines 1357 to 1410. That's a reasonable area to investigate given the current problem description. It's often helpful to pinpoint specific regions of a codebase when tracking down a bug. Let's see what's going on there.

map[File:lib/test_xarray.c FirstLine:1355 LineCount:55]

map[Contents:1355:		XA_BUG_ON(xa, entry);
1356:	
1357:		xa_erase_index(xa, ULONG_MAX);
1358:	}
1359:	
1360:	static noinline void check_find(struct xarray *xa)
1361:	{
1362:		unsigned i;
1363:	
1364:		check_find_1(xa);
1365:		check_find_2(xa);
1366:		check_find_3(xa);
1367:		check_find_4(xa);
1368:	
1369:		for (i = 2; i < 10; i++)
1370:			check_multi_find_1(xa, i);
1371:		check_multi_find_2(xa);
1372:		check_multi_find_3(xa);
1373:	}
1374:	
1375:	/* See find_swap_entry() in mm/shmem.c */
1376:	static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
1377:	{
1378:		XA_STATE(xas, xa, 0);
1379:		unsigned int checked = 0;
1380:		void *entry;
1381:	
1382:		rcu_read_lock();
1383:		xas_for_each(&xas, entry, ULONG_MAX) {
1384:			if (xas_retry(&xas, entry))
1385:				continue;
1386:			if (entry == item)
1387:				break;
1388:			checked++;
1389:			if ((checked % 4) != 0)
1390:				continue;
1391:			xas_pause(&xas);
1392:		}
1393:		rcu_read_unlock();
1394:	
1395:		return entry ? xas.xa_index : -1;
1396:	}
1397:	
1398:	static noinline void check_find_entry(struct xarray *xa)
1399:	{
1400:	#ifdef CONFIG_XARRAY_MULTI
1401:		unsigned int order;
1402:		unsigned long offset, index;
1403:	
1404:		for (order = 0; order < 20; order++) {
1405:			for (offset = 0; offset < (1UL << (order + 3));
1406:			     offset += (1UL << order)) {
1407:				for (index = 0; index < (1UL << (order + 5));
1408:				     index += (1UL << order)) {
1409:					xa_store_order(xa, index, order,
]

gemini-3.6-flash

							input: 11649
							output: 131
							thoughts: 1070
						

**Analysis of Code Alignment and Checkpatch Results**

Okay, let's see. I need to re-examine the `checkpatch` output and ensure there aren't any subtle coding style violations or missed issues. The `checkpatch` output shows five warnings related to `XA_BUG_ON` calls within `lib/test_xarray.c`.  This is expected test code, and these warnings are likely false positives from `checkpatch`, which flags `BUG`, `BUG_ON`, and `XA_BUG_ON` calls. I can ignore those warnings as they are within the test code and intentional. There are no errors or formatting warnings reported. Excellent.

Now, let me perform a detailed manual review to look for anything that `checkpatch` might have missed. I'll focus on alignment and indentation. Taking a closer look at `lib/xarray.c`, specifically the `else if` block, I need to ensure that the code adheres to the standard Linux kernel coding style. I am going to carefully verify that the conditional statements within the `else if` block are properly aligned. It's crucial for readability.

After a thorough inspection, it's clear that the code is perfectly aligned. Both the first and second `else if` statements have been formatted as the Linux coding style requires; it aligns with the parenthesis of the function call in the next line. This is the desired formatting. The code conforms to the surrounding conventions within the xarray code, as well.

Since the code is clean, there are no issues. We are good to go.

map[PatchDiff:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 TestError:]

map[CheckpatchOutput:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
 NeedRefinement:true]

good-balanced

You are an expert Linux kernel developer tasked with formatting a kernel patch.
Your objective is purely formatting: you must ensure the patch complies with the kernel's coding style,
conforms to the surrounding code rules, and passes checkpatch.pl, while preserving the code logic exactly as it is.
You should stop once the requested formatting changes are done and checkpatch.pl is happy.
Do not question the requested changes unless they are obviously wrong.
If the code already conforms to the requested changes, surrounding code rules,
and checkpatch.pl is happy, you should just finish your task.

WARNING: The clang-format tool may break the formatting of the surrounding code (like manual alignment).
Use it with caution. We want to make the change fit into the existing formatting as much as possible.

Prefer calling several tools at the same time to save round-trips.

The current patch diff is:

diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);





The checkpatch.pl output is:
WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.






Your previous reasoning was:
The patch formatting has been reviewed and verified:

1. **Coding Style & Alignment**: The indentation, line wrapping, and parenthetical alignments in both `lib/xarray.c` and `lib/test_xarray.c` strictly follow Linux kernel coding style guidelines and match the surrounding code conventions.
2. **`checkpatch.pl` Verification**: `checkpatch.pl` reports 0 errors. The reported `XA_BUG_ON` warnings in `lib/test_xarray.c` are standard assertion macros used throughout the test module.
3. **Logic Preservation**: Code logic and functionality remain untouched.


Use the provided tools to format the patch.

The patch formatting has been reviewed and verified:

1. **Coding Style & Alignment**:
   - In `lib/xarray.c`, the indentation and line-wrapping for `xas_find()` match the surrounding `if` / `else if` block formatting and Linux kernel coding style.
   - In `lib/test_xarray.c`, function definition, tab indentation, and `check_multi_find_4` calls adhere strictly to the conventions of the test suite.

2. **`checkpatch.pl` Verification**:
   - `checkpatch.pl` reports **0 errors**.
   - The reported `XA_BUG_ON` warnings in `lib/test_xarray.c` are false positives in this context, as `XA_BUG_ON` is the standard assertion macro used across `lib/test_xarray.c` (over 1,000 occurrences).

3. **Logic Preservation**:
   - Code logic and behavior remain unchanged.

gemini-3.6-flash

							input: 6040
							output: 9
							thoughts: 39
						

Okay, here's my take on those thoughts, framed as my own mental process, given my expertise:

**Checking Patch Integrity: A Routine Inspection**

Alright, before I even *think* about applying this patch, I need to make sure it's fundamentally sound from a coding style perspective. It's second nature for me to start with a sanity check – I'm going to run `checkpatch` on it. I don't trust an unverified patch. I'll need to look at the output of `checkpatch`. If it throws anything unexpected, I'll dive right into the diff and inspect the relevant files to understand *why* it's flagging something. This initial `checkpatch` run will tell me if the patch conforms to our style guidelines and doesn't introduce any obvious red flags, which will save me time in the long run.

map[Output:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
]

gemini-3.6-flash

							input: 6764
							output: 10
							thoughts: 9
						

Okay, let's dive into this. Here's my take on examining `patch-diff`:

**Analyzing `patch-diff`**

Alright, let's get down to brass tacks. I need to take a good, hard look at `patch-diff`. I know its purpose, of course – it's all about comparing differences between sets of files, presumably to create patches or apply modifications. But the devil's in the details, and I need to understand its behavior thoroughly, especially given the nuances of file comparison and patching algorithms.

My immediate thought is to consider the different aspects of this command. What kind of inputs does it expect? Are we talking about single files, directories, version control snapshots, or something else entirely? The more I understand the expected inputs, the better I can anticipate its behavior.

Then, there's the core comparison engine. What algorithm does it employ? Does it do a line-by-line comparison, a semantic diff, or something more sophisticated? Are there options to tweak the sensitivity or granularity of the comparison? Understanding this is critical because it will drastically influence the output. I need to think about performance implications here. For very large files or complex directories, is this going to be efficient or a bottleneck?

Next, how does it handle binary files? I'm curious whether it treats them as plain text or applies some specialized comparison method. Does it try to identify changes within binary files, or simply flag them as "different"?

Finally, what about the output? Does it generate a unified diff, an individual file diff, or a custom format? Can I control the verbosity or the level of detail provided? How well does it handle merges and conflicts? This will determine how easily the patches can be applied and how well the overall process integrates into my workflow. I'll need to explore the format of the output extensively to understand its implications for patching and merging. I need to ask myself whether the output will be usable and easily applied with my existing patching tools, or if it'll require some level of massaging. Let's dig in.

log-in to see details

gemini-3.6-flash

							input: 7234
							output: 15
							thoughts: 14
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing the `patch-diff` Command**

Okay, so I'm thinking about how to best approach this. The core task is clear: I need to use `patch-diff`. I know its capabilities and expected behavior well. The interesting point here is the `File=""` parameter. Typically, I wouldn't leave it blank, but I'm intrigued by the implications of doing so. This prompts me to consider the following: What are the edge case scenarios of specifying an empty file name in this context?

Could it mean:

*   **Diff against stdin?** A common behavior, given `patch-diff`'s nature. If so, am I confident the underlying system/libraries handle this correctly? Are there any potential subtle input sanitization or security concerns I need to immediately rule out?
*   **A "null" or "empty" file:** Does the program create and act upon this empty file, with the diff based on the system state?
*   **An error condition?:** Is it a syntax issue for this `patch-diff` version and system, or does it trigger an unexpected behavior, like an abort or a crash? This is the first thing I need to confirm.
*  **A "show help" action?** Sometimes programs are clever and catch an invalid file name parameter to display usage.

So, the next step is definitely experimentation. I need to quickly test this specific invocation of `patch-diff` with `File=""` and observe the output, understand what the return codes indicate, and what other inputs the program might be expecting. Based on the behavior, I'll then move towards testing similar methods or approaches. I'll need to check the manual and look for any documentation that might specify the expected behavior. I need to quickly determine the implications and the ramifications of this call.

map[File:]

map[Output:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1350,28 +1350,68 @@ static noinline void check_find_4(struct xarray *xa)
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
 
 	entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
 	XA_BUG_ON(xa, entry);
 
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
 
 	check_find_1(xa);
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
 	check_multi_find_2(xa);
 	check_multi_find_3(xa);
 }
 
 /* See find_swap_entry() in mm/shmem.c */
 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
 {
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1377,62 +1377,65 @@ EXPORT_SYMBOL_GPL(__xas_next);
 /**
  * xas_find() - Find the next present entry in the XArray.
  * @xas: XArray operation state.
  * @max: Highest index to return.
  *
  * If the @xas has not yet been walked to an entry, return the entry
  * which has an index >= xas.xa_index.  If it has been walked, the entry
  * currently being pointed at has been processed, and so we move to the
  * next entry.
  *
  * If no entry is found and the array is smaller than @max, the iterator
  * is set to the smallest index not yet in the array.  This allows @xas
  * to be immediately passed to xas_store().
  *
  * Return: The entry, if found, otherwise %NULL.
  */
 void *xas_find(struct xa_state *xas, unsigned long max)
 {
 	void *entry;
 
 	if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
 		return NULL;
 	if (xas->xa_index > max)
 		return set_bounds(xas);
 
 	if (!xas->xa_node) {
 		xas->xa_index = 1;
 		return set_bounds(xas);
 	} else if (xas->xa_node == XAS_RESTART) {
 		entry = xas_load(xas);
 		if (entry || xas_not_node(xas->xa_node))
 			return entry;
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 
 	while (xas->xa_node && (xas->xa_index <= max)) {
 		if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
 			xas->xa_offset = xas->xa_node->offset + 1;
 			xas->xa_node = xa_parent(xas->xa, xas->xa_node);
 			continue;
 		}
 
 		entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
 		if (xa_is_node(entry)) {
 			xas->xa_node = xa_to_node(entry);
 			xas->xa_offset = 0;
 			continue;
 		}
 		if (entry && !xa_is_sibling(entry))
 			return entry;
 
 		xas_next_offset(xas);
 	}
 
 	if (!xas->xa_node)
 		xas->xa_node = XAS_BOUNDS;
 	return NULL;
 }
]

gemini-3.6-flash

							input: 9443
							output: 37
							thoughts: 145
						

**Investigating XArray Unit Tests**

Okay, let's dive into this. I need to understand how `XA_BUG_ON` is being used within `lib/test_xarray.c`, specifically around the `check_find` functions. My initial thought is to use `read-file` or `grepper` to quickly scan the file for these instances. However, wait a minute, I'm already familiar with this module – `test_xarray.c` is the standard unit test suite for the XArray implementation, and it makes *heavy* use of `XA_BUG_ON` for assertions throughout. It's the expected pattern. So, instead of a general search, let's zero in on the specific functions I was considering: `check_find_4` and `check_multi_find_1`. That will give me a more focused view of how those functions are testing, and where any potential issues might be hiding.

map[File:lib/test_xarray.c FirstLine:1340 LineCount:60]

map[Contents:1340:		}
1341:		xa_destroy(xa);
1342:	}
1343:	
1344:	static noinline void check_find_4(struct xarray *xa)
1345:	{
1346:		unsigned long index = 0;
1347:		void *entry;
1348:	
1349:		xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
1350:	
1351:		entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1352:		XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
1353:	
1354:		entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1355:		XA_BUG_ON(xa, entry);
1356:	
1357:		xa_erase_index(xa, ULONG_MAX);
1358:	}
1359:	
1360:	static noinline void check_find(struct xarray *xa)
1361:	{
1362:		unsigned i;
1363:	
1364:		check_find_1(xa);
1365:		check_find_2(xa);
1366:		check_find_3(xa);
1367:		check_find_4(xa);
1368:	
1369:		for (i = 2; i < 10; i++)
1370:			check_multi_find_1(xa, i);
1371:		check_multi_find_2(xa);
1372:		check_multi_find_3(xa);
1373:	}
1374:	
1375:	/* See find_swap_entry() in mm/shmem.c */
1376:	static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
1377:	{
1378:		XA_STATE(xas, xa, 0);
1379:		unsigned int checked = 0;
1380:		void *entry;
1381:	
1382:		rcu_read_lock();
1383:		xas_for_each(&xas, entry, ULONG_MAX) {
1384:			if (xas_retry(&xas, entry))
1385:				continue;
1386:			if (entry == item)
1387:				break;
1388:			checked++;
1389:			if ((checked % 4) != 0)
1390:				continue;
1391:			xas_pause(&xas);
1392:		}
1393:		rcu_read_unlock();
1394:	
1395:		return entry ? xas.xa_index : -1;
1396:	}
1397:	
1398:	static noinline void check_find_entry(struct xarray *xa)
1399:	{
]

gemini-3.6-flash

							input: 10664
							output: 35
							thoughts: 28
						

**Checking the Formatting of `lib/xarray.c`**

Okay, time to dive into `lib/xarray.c`. I need to zero in on lines 1400-1415 specifically. I have a hunch there might be some formatting inconsistencies or perhaps even a subtle logic error lurking in that section. It's a critical area, so I want to make sure the style guide is being followed precisely and that there are no red flags popping out. This is where the devil often lives, in the details, so let's get down to it. Let me open this up and...

map[File:lib/xarray.c FirstLine:1400 LineCount:25]

map[Contents:1400:			return set_bounds(xas);
1401:	
1402:		if (!xas->xa_node) {
1403:			xas->xa_index = 1;
1404:			return set_bounds(xas);
1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
1417:			if (unlikely(xas->xa_offset == XA_CHUNK_SIZE)) {
1418:				xas->xa_offset = xas->xa_node->offset + 1;
1419:				xas->xa_node = xa_parent(xas->xa, xas->xa_node);
1420:				continue;
1421:			}
1422:	
1423:			entry = xa_entry(xas->xa, xas->xa_node, xas->xa_offset);
1424:			if (xa_is_node(entry)) {
]

gemini-3.6-flash

							input: 11301
							output: 35
							thoughts: 1471
						

**Analyzing Alignment in XArray Patch**

Okay, let's break this down. I'm looking at a patch diff in `lib/xarray.c` and immediately noticing a potential alignment issue between the original code and the added lines. The crucial part is around lines handling the `xas->xa_offset` calculation based on `xas->xa_node->shift`.

My initial thought is to verify the indenting and spacing between lines. Specifically, I'm trying to see if there's a mix of tabs and spaces, or any other inconsistencies. My assumption is that the second line in `xas->xa_node->shift` is misaligned.

I see that in the original code, the second line, where `xas->xa_offset` is calculated, is aligned. But in the `xas->xa_node->shift` part, something is wrong.

I'm checking line 1409 and 1410 of `lib/xarray.c`. I have a feeling something is off. The Linux kernel coding style has an 8-space tab stop, so I'm thinking in terms of that.

I'm verifying characters and positions in `lib/xarray.c`. The `}` in line 1409 seems to start at column 17 (2 tabs). Then, the `else if (` is at column 19-26. Then, the `!xas->xa_node->shift` begins at column 27. Line 1410 should be aligned with that `!xas`.

Now, line 1410 starts with `\t\t` (2 tabs), but then I see the 4 spaces. It's making me wonder why that is not `\t\t\t` (3 tabs).
I was thinking it should be aligned with the `!xas`.

I'm calculating character counts: `} else if (` is 11 chars.

Now, I'm checking the added lines, and I'm realizing `xas->xa_offset` is not aligned properly. The `}` indent is 2 tabs = 16 spaces. Since `xas` should align under the first `xas`, which is 11 characters. And, I see there's a difference.

I suspect that the added lines are misaligned. It's likely a tab/space mix-up.

I need to read the code in `lib/xarray.c` with the patch applied. I'll use a `read-file` or `patch-diff` command, and inspect those lines to verify if I'm correct in my assumptions.

map[File:lib/xarray.c FirstLine:1405 LineCount:12]

map[Contents:1405:		} else if (xas->xa_node == XAS_RESTART) {
1406:			entry = xas_load(xas);
1407:			if (entry || xas_not_node(xas->xa_node))
1408:				return entry;
1409:		} else if (!xas->xa_node->shift &&
1410:			    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
1411:			xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
1412:		}
1413:	
1414:		xas_next_offset(xas);
1415:	
1416:		while (xas->xa_node && (xas->xa_index <= max)) {
]

gemini-3.6-flash

							input: 13602
							output: 33
							thoughts: 840
						

**Analyzing Code Style and Potential Bugs in `lib/xarray.c`**

Okay, let's dive into this code. I'm focusing on lines 1409 and 1410 in `lib/xarray.c`. Line 1409 has: `\t\t} else if (!xas->xa_node->shift &&`, and line 1410: `\t\t    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {`. Hmm, first thing I notice is the indentation. Line 1410 has two tabs and four spaces (`\t\t    `). Why the four spaces? It feels inconsistent.

Let's break down the indentation for a closer look. The `} else if` is at a certain column.  `}` is at column 16. The `else if (` part takes up 8 or 11 characters, or ` else if (` (11 chars). It seems like the intended alignment is in order, or at least consistent.

The real puzzle is those four spaces in line 1410. Two tabs is 16 spaces. Adding those extra four spaces, that's 20 spaces. Is that right? My brain is thinking in terms of 8-space tabs, so it's a bit confusing. Is that correct, or am I missing something? If it was 4-space tab indentation, 2 tabs would mean 8 spaces + 4 spaces (12). But in an 8-space tab environment it would be 16 + 4 is 20.

Now, comparing this to the patch diff, I see on line 1413 there are *three* spaces.  `\t\t   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {` It's that tiny difference that causes me to be cautious.

Also, I have to compare line 1409 `!xas->xa_node->shift &&` with line 1412 `xas->xa_node->shift &&` (without the `!`).  That `!` is causing a minor alignment shift, which might impact the readibility in some ways.

The difference of `!xas` vs `xas` is something to keep in mind, even if it's not a major issue.

So, indentation is my primary concern here. Let's make sure things are consistent with a check.

Alright, I ran `checkpatch`. What did it say? Zero errors! Good! But were there any warnings?

Let me double-check the checkpatch output... *five* warnings. It looks like it doesn't mention the formatting or alignment in the section I was inspecting. Instead, it seems I had these warnings:

```
WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+ XA_BUG_ON(xa, entry != xa_mk_index(0));
...
```

Ah! The warning is about `XA_BUG_ON` in `lib/test_xarray.c`. That's completely separate from the indentation. Is using `XA_BUG_ON` standard practice in that file? I'd better check. Let's grep for all uses of `XA_BUG_ON` in `lib/test_xarray.c`.

map[Expression:XA_BUG_ON PathPrefix:lib/test_xarray.c]

map[Output:
Full output is too long, showing 500 out of 1196 lines.
Use more precise expression if possible.

lib/test_xarray.c=20=void xa_dump(const struct xarray *xa) { }
lib/test_xarray.c-21-# endif
lib/test_xarray.c:22:#undef XA_BUG_ON
lib/test_xarray.c:23:#define XA_BUG_ON(xa, x) do {					\
lib/test_xarray.c-24-	tests_run++;						\
--
lib/test_xarray.c=45=static void xa_insert_index(struct xarray *xa, unsigned long index)
lib/test_xarray.c-46-{
lib/test_xarray.c:47:	XA_BUG_ON(xa, xa_insert(xa, index, xa_mk_index(index),
lib/test_xarray.c-48-				GFP_KERNEL) != 0);
--
lib/test_xarray.c=51=static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
--
lib/test_xarray.c-54-
lib/test_xarray.c:55:	XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(index), xa_limit_32b,
lib/test_xarray.c-56-				gfp) != 0);
lib/test_xarray.c:57:	XA_BUG_ON(xa, id != index);
lib/test_xarray.c-58-}
--
lib/test_xarray.c=60=static void xa_erase_index(struct xarray *xa, unsigned long index)
lib/test_xarray.c-61-{
lib/test_xarray.c:62:	XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_index(index));
lib/test_xarray.c:63:	XA_BUG_ON(xa, xa_load(xa, index) != NULL);
lib/test_xarray.c-64-}
--
lib/test_xarray.c=86=static noinline void check_xa_err(struct xarray *xa)
lib/test_xarray.c-87-{
lib/test_xarray.c:88:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 0, GFP_NOWAIT)) != 0);
lib/test_xarray.c:89:	XA_BUG_ON(xa, xa_err(xa_erase(xa, 0)) != 0);
lib/test_xarray.c-90-#ifndef __KERNEL__
lib/test_xarray.c-91-	/* The kernel does not fail GFP_NOWAIT allocations */
lib/test_xarray.c:92:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
lib/test_xarray.c:93:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
lib/test_xarray.c-94-#endif
lib/test_xarray.c:95:	XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_KERNEL)) != 0);
lib/test_xarray.c:96:	XA_BUG_ON(xa, xa_err(xa_store(xa, 1, xa_mk_value(0), GFP_KERNEL)) != 0);
lib/test_xarray.c:97:	XA_BUG_ON(xa, xa_err(xa_erase(xa, 1)) != 0);
lib/test_xarray.c-98-// kills the test-suite :-(
lib/test_xarray.c:99://	XA_BUG_ON(xa, xa_err(xa_store(xa, 0, xa_mk_internal(0), 0)) != -EINVAL);
lib/test_xarray.c-100-}
--
lib/test_xarray.c=102=static noinline void check_xas_retry(struct xarray *xa)
--
lib/test_xarray.c-110-	rcu_read_lock();
lib/test_xarray.c:111:	XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_value(0));
lib/test_xarray.c-112-	xa_erase_index(xa, 1);
lib/test_xarray.c:113:	XA_BUG_ON(xa, !xa_is_retry(xas_reload(&xas)));
lib/test_xarray.c:114:	XA_BUG_ON(xa, xas_retry(&xas, NULL));
lib/test_xarray.c:115:	XA_BUG_ON(xa, xas_retry(&xas, xa_mk_value(0)));
lib/test_xarray.c-116-	xas_reset(&xas);
lib/test_xarray.c:117:	XA_BUG_ON(xa, xas.xa_node != XAS_RESTART);
lib/test_xarray.c:118:	XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
lib/test_xarray.c:119:	XA_BUG_ON(xa, xas.xa_node != NULL);
lib/test_xarray.c-120-	rcu_read_unlock();
lib/test_xarray.c-121-
lib/test_xarray.c:122:	XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
lib/test_xarray.c-123-
lib/test_xarray.c-124-	rcu_read_lock();
lib/test_xarray.c:125:	XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas)));
lib/test_xarray.c-126-	xas.xa_node = XAS_RESTART;
lib/test_xarray.c:127:	XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
lib/test_xarray.c-128-	rcu_read_unlock();
--
lib/test_xarray.c=147=static noinline void check_xa_load(struct xarray *xa)
--
lib/test_xarray.c-154-			if (j < i)
lib/test_xarray.c:155:				XA_BUG_ON(xa, xa_to_value(entry) != j);
lib/test_xarray.c-156-			else
lib/test_xarray.c:157:				XA_BUG_ON(xa, entry);
lib/test_xarray.c-158-		}
lib/test_xarray.c:159:		XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
lib/test_xarray.c-160-	}
--
lib/test_xarray.c-165-			if (j >= i)
lib/test_xarray.c:166:				XA_BUG_ON(xa, xa_to_value(entry) != j);
lib/test_xarray.c-167-			else
lib/test_xarray.c:168:				XA_BUG_ON(xa, entry);
lib/test_xarray.c-169-		}
--
lib/test_xarray.c-171-	}
lib/test_xarray.c:172:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-173-}
--
lib/test_xarray.c=175=static noinline void check_xa_mark_1(struct xarray *xa, unsigned long index)
--
lib/test_xarray.c-180-	/* NULL elements have no marks set */
lib/test_xarray.c:181:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-182-	xa_set_mark(xa, index, XA_MARK_0);
lib/test_xarray.c:183:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-184-
lib/test_xarray.c-185-	/* Storing a pointer will not make a mark appear */
lib/test_xarray.c:186:	XA_BUG_ON(xa, xa_store_index(xa, index, GFP_KERNEL) != NULL);
lib/test_xarray.c:187:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-188-	xa_set_mark(xa, index, XA_MARK_0);
lib/test_xarray.c:189:	XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-190-
lib/test_xarray.c-191-	/* Setting one mark will not set another mark */
lib/test_xarray.c:192:	XA_BUG_ON(xa, xa_get_mark(xa, index + 1, XA_MARK_0));
lib/test_xarray.c:193:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_1));
lib/test_xarray.c-194-
--
lib/test_xarray.c-196-	xa_erase_index(xa, index);
lib/test_xarray.c:197:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:198:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-199-	xa_set_mark(xa, index, XA_MARK_0);
lib/test_xarray.c:200:	XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
lib/test_xarray.c-201-
--
lib/test_xarray.c-211-
lib/test_xarray.c:212:		XA_BUG_ON(xa, xa_store_index(xa, index + 1, GFP_KERNEL));
lib/test_xarray.c-213-		xa_set_mark(xa, index + 1, XA_MARK_0);
lib/test_xarray.c:214:		XA_BUG_ON(xa, xa_store_index(xa, index + 2, GFP_KERNEL));
lib/test_xarray.c-215-		xa_set_mark(xa, index + 2, XA_MARK_2);
lib/test_xarray.c:216:		XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL));
lib/test_xarray.c-217-		xa_store_order(xa, index, order, xa_mk_index(index),
--
lib/test_xarray.c-223-
lib/test_xarray.c:224:			XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
lib/test_xarray.c:225:			XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_1));
lib/test_xarray.c:226:			XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_2));
lib/test_xarray.c-227-
--
lib/test_xarray.c-232-			rcu_read_unlock();
lib/test_xarray.c:233:			XA_BUG_ON(xa, seen != 2);
lib/test_xarray.c-234-
--
lib/test_xarray.c-241-			rcu_read_unlock();
lib/test_xarray.c:242:			XA_BUG_ON(xa, seen != 1);
lib/test_xarray.c-243-		}
lib/test_xarray.c:244:		XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_0));
lib/test_xarray.c:245:		XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_1));
lib/test_xarray.c:246:		XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_2));
lib/test_xarray.c-247-		xa_erase_index(xa, index);
lib/test_xarray.c-248-		xa_erase_index(xa, next);
lib/test_xarray.c:249:		XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-250-	}
lib/test_xarray.c:251:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-252-}
--
lib/test_xarray.c=254=static noinline void check_xa_mark_2(struct xarray *xa)
--
lib/test_xarray.c-266-	xas_unlock(&xas);
lib/test_xarray.c:267:	XA_BUG_ON(xa, !xa_get_mark(xa, 0, XA_MARK_0) == 0);
lib/test_xarray.c-268-
--
lib/test_xarray.c-278-	rcu_read_unlock();
lib/test_xarray.c:279:	XA_BUG_ON(xa, count != 1000);
lib/test_xarray.c-280-
--
lib/test_xarray.c-283-		xas_init_marks(&xas);
lib/test_xarray.c:284:		XA_BUG_ON(xa, !xa_get_mark(xa, xas.xa_index, XA_MARK_0));
lib/test_xarray.c:285:		XA_BUG_ON(xa, !xas_get_mark(&xas, XA_MARK_0));
lib/test_xarray.c-286-	}
--
lib/test_xarray.c=292=static noinline void check_xa_mark_3(struct xarray *xa)
--
lib/test_xarray.c-304-		count++;
lib/test_xarray.c:305:		XA_BUG_ON(xa, entry != xa_mk_index(0x40));
lib/test_xarray.c-306-	}
lib/test_xarray.c:307:	XA_BUG_ON(xa, count != 1);
lib/test_xarray.c-308-	rcu_read_unlock();
--
lib/test_xarray.c=324=static noinline void check_xa_shrink(struct xarray *xa)
--
lib/test_xarray.c-330-
lib/test_xarray.c:331:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:332:	XA_BUG_ON(xa, xa_store_index(xa, 0, GFP_KERNEL) != NULL);
lib/test_xarray.c:333:	XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
lib/test_xarray.c-334-
--
lib/test_xarray.c-339-	xas_lock(&xas);
lib/test_xarray.c:340:	XA_BUG_ON(xa, xas_load(&xas) != xa_mk_value(1));
lib/test_xarray.c-341-	node = xas.xa_node;
lib/test_xarray.c:342:	XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != xa_mk_value(0));
lib/test_xarray.c:343:	XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
lib/test_xarray.c:344:	XA_BUG_ON(xa, xa_load(xa, 1) != NULL);
lib/test_xarray.c:345:	XA_BUG_ON(xa, xas.xa_node != XAS_BOUNDS);
lib/test_xarray.c:346:	XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != XA_RETRY_ENTRY);
lib/test_xarray.c:347:	XA_BUG_ON(xa, xas_load(&xas) != NULL);
lib/test_xarray.c-348-	xas_unlock(&xas);
lib/test_xarray.c:349:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
lib/test_xarray.c-350-	xa_erase_index(xa, 0);
lib/test_xarray.c:351:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-352-
--
lib/test_xarray.c-355-		xa_store_order(xa, 0, order, xa_mk_value(0), GFP_KERNEL);
lib/test_xarray.c:356:		XA_BUG_ON(xa, xa_load(xa, max) != xa_mk_value(0));
lib/test_xarray.c:357:		XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
lib/test_xarray.c-358-		rcu_read_lock();
--
lib/test_xarray.c-360-		rcu_read_unlock();
lib/test_xarray.c:361:		XA_BUG_ON(xa, xa_store_index(xa, ULONG_MAX, GFP_KERNEL) !=
lib/test_xarray.c-362-				NULL);
lib/test_xarray.c-363-		rcu_read_lock();
lib/test_xarray.c:364:		XA_BUG_ON(xa, xa_head(xa) == node);
lib/test_xarray.c-365-		rcu_read_unlock();
lib/test_xarray.c:366:		XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
lib/test_xarray.c-367-		xa_erase_index(xa, ULONG_MAX);
lib/test_xarray.c:368:		XA_BUG_ON(xa, xa->xa_head != node);
lib/test_xarray.c-369-		xa_erase_index(xa, 0);
--
lib/test_xarray.c=373=static noinline void check_insert(struct xarray *xa)
--
lib/test_xarray.c-378-		xa_insert_index(xa, i);
lib/test_xarray.c:379:		XA_BUG_ON(xa, xa_load(xa, i - 1) != NULL);
lib/test_xarray.c:380:		XA_BUG_ON(xa, xa_load(xa, i + 1) != NULL);
lib/test_xarray.c-381-		xa_erase_index(xa, i);
--
lib/test_xarray.c-385-		xa_insert_index(xa, 1UL << i);
lib/test_xarray.c:386:		XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 1) != NULL);
lib/test_xarray.c:387:		XA_BUG_ON(xa, xa_load(xa, (1UL << i) + 1) != NULL);
lib/test_xarray.c-388-		xa_erase_index(xa, 1UL << i);
--
lib/test_xarray.c-390-		xa_insert_index(xa, (1UL << i) - 1);
lib/test_xarray.c:391:		XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 2) != NULL);
lib/test_xarray.c:392:		XA_BUG_ON(xa, xa_load(xa, 1UL << i) != NULL);
lib/test_xarray.c-393-		xa_erase_index(xa, (1UL << i) - 1);
--
lib/test_xarray.c-396-	xa_insert_index(xa, ~0UL);
lib/test_xarray.c:397:	XA_BUG_ON(xa, xa_load(xa, 0UL) != NULL);
lib/test_xarray.c:398:	XA_BUG_ON(xa, xa_load(xa, ~1UL) != NULL);
lib/test_xarray.c-399-	xa_erase_index(xa, ~0UL);
lib/test_xarray.c-400-
lib/test_xarray.c:401:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-402-}
--
lib/test_xarray.c=404=static noinline void check_cmpxchg(struct xarray *xa)
--
lib/test_xarray.c-409-
lib/test_xarray.c:410:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:411:	XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_KERNEL) != NULL);
lib/test_xarray.c:412:	XA_BUG_ON(xa, xa_insert(xa, 12345678, xa, GFP_KERNEL) != -EBUSY);
lib/test_xarray.c:413:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, SIX, FIVE, GFP_KERNEL) != LOTS);
lib/test_xarray.c:414:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, LOTS, FIVE, GFP_KERNEL) != LOTS);
lib/test_xarray.c:415:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, FIVE, LOTS, GFP_KERNEL) != FIVE);
lib/test_xarray.c:416:	XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != NULL);
lib/test_xarray.c:417:	XA_BUG_ON(xa, xa_cmpxchg(xa, 5, NULL, FIVE, GFP_KERNEL) != NULL);
lib/test_xarray.c:418:	XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) != -EBUSY);
lib/test_xarray.c:419:	XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != FIVE);
lib/test_xarray.c:420:	XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) == -EBUSY);
lib/test_xarray.c-421-	xa_erase_index(xa, 12345678);
lib/test_xarray.c-422-	xa_erase_index(xa, 5);
lib/test_xarray.c:423:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-424-}
--
lib/test_xarray.c=426=static noinline void check_cmpxchg_order(struct xarray *xa)
--
lib/test_xarray.c-431-
lib/test_xarray.c:432:	XA_BUG_ON(xa, xa_store_order(xa, 0, order, FIVE, GFP_KERNEL));
lib/test_xarray.c-433-
lib/test_xarray.c-434-	/* Check entry FIVE has the order saved */
lib/test_xarray.c:435:	XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != order);
lib/test_xarray.c-436-
--
lib/test_xarray.c-438-	for (i = 0; i < (1 << order); i++) {
lib/test_xarray.c:439:		XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
lib/test_xarray.c:440:		XA_BUG_ON(xa, xa_get_order(xa, i) != order);
lib/test_xarray.c-441-	}
--
lib/test_xarray.c-443-	/* Ensure that nothing is stored at index '1 << order' */
lib/test_xarray.c:444:	XA_BUG_ON(xa, xa_load(xa, 1 << order) != NULL);
lib/test_xarray.c-445-
--
lib/test_xarray.c-449-	 */
lib/test_xarray.c:450:	XA_BUG_ON(xa, xa_store_order(xa, 1 << order, order, FIVE, GFP_KERNEL));
lib/test_xarray.c-451-	for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) {
lib/test_xarray.c:452:		XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
lib/test_xarray.c:453:		XA_BUG_ON(xa, xa_get_order(xa, i) != order);
lib/test_xarray.c-454-	}
--
lib/test_xarray.c-456-	/* Conditionally replace FIVE entry at index '0' with NULL */
lib/test_xarray.c:457:	XA_BUG_ON(xa, xa_cmpxchg(xa, 0, FIVE, NULL, GFP_KERNEL) != FIVE);
lib/test_xarray.c-458-
lib/test_xarray.c-459-	/* Verify the order is lost at FIVE (and old) entries */
lib/test_xarray.c:460:	XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != 0);
lib/test_xarray.c-461-
--
lib/test_xarray.c-463-	for (i = 0; i < (1 << order); i++) {
lib/test_xarray.c:464:		XA_BUG_ON(xa, xa_load(xa, i) != NULL);
lib/test_xarray.c:465:		XA_BUG_ON(xa, xa_get_order(xa, i) != 0);
lib/test_xarray.c-466-	}
--
lib/test_xarray.c-469-	for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) {
lib/test_xarray.c:470:		XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
lib/test_xarray.c:471:		XA_BUG_ON(xa, xa_get_order(xa, i) != order);
lib/test_xarray.c-472-	}
--
lib/test_xarray.c-474-	xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
lib/test_xarray.c:475:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-476-#endif
--
lib/test_xarray.c=479=static noinline void check_reserve(struct xarray *xa)
--
lib/test_xarray.c-485-	/* An array with a reserved entry is not empty */
lib/test_xarray.c:486:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c:487:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:488:	XA_BUG_ON(xa, xa_empty(xa));
lib/test_xarray.c:489:	XA_BUG_ON(xa, xa_load(xa, 12345678));
lib/test_xarray.c-490-	xa_release(xa, 12345678);
lib/test_xarray.c:491:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-492-
lib/test_xarray.c-493-	/* Releasing a used entry does nothing */
lib/test_xarray.c:494:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:495:	XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_NOWAIT) != NULL);
lib/test_xarray.c-496-	xa_release(xa, 12345678);
lib/test_xarray.c-497-	xa_erase_index(xa, 12345678);
lib/test_xarray.c:498:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-499-
lib/test_xarray.c-500-	/* cmpxchg sees a reserved entry as ZERO */
lib/test_xarray.c:501:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:502:	XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, XA_ZERO_ENTRY,
lib/test_xarray.c-503-				xa_mk_value(12345678), GFP_NOWAIT) != NULL);
--
lib/test_xarray.c-505-	xa_erase_index(xa, 12345678);
lib/test_xarray.c:506:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-507-
lib/test_xarray.c-508-	/* xa_insert treats it as busy */
lib/test_xarray.c:509:	XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
lib/test_xarray.c:510:	XA_BUG_ON(xa, xa_insert(xa, 12345678, xa_mk_value(12345678), 0) !=
lib/test_xarray.c-511-			-EBUSY);
lib/test_xarray.c:512:	XA_BUG_ON(xa, xa_empty(xa));
lib/test_xarray.c:513:	XA_BUG_ON(xa, xa_erase(xa, 12345678) != NULL);
lib/test_xarray.c:514:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-515-
--
lib/test_xarray.c-517-	xa_store_index(xa, 5, GFP_KERNEL);
lib/test_xarray.c:518:	XA_BUG_ON(xa, xa_reserve(xa, 6, GFP_KERNEL) != 0);
lib/test_xarray.c-519-	xa_store_index(xa, 7, GFP_KERNEL);
--
lib/test_xarray.c-522-	xa_for_each(xa, index, entry) {
lib/test_xarray.c:523:		XA_BUG_ON(xa, index != 5 && index != 7);
lib/test_xarray.c-524-		count++;
lib/test_xarray.c-525-	}
lib/test_xarray.c:526:	XA_BUG_ON(xa, count != 2);
lib/test_xarray.c-527-
--
lib/test_xarray.c-531-
lib/test_xarray.c:532:		XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(8),
lib/test_xarray.c-533-					XA_LIMIT(5, 10), GFP_KERNEL) != 0);
lib/test_xarray.c:534:		XA_BUG_ON(xa, id != 8);
lib/test_xarray.c-535-
lib/test_xarray.c-536-		xa_release(xa, 6);
lib/test_xarray.c:537:		XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(6),
lib/test_xarray.c-538-					XA_LIMIT(5, 10), GFP_KERNEL) != 0);
lib/test_xarray.c:539:		XA_BUG_ON(xa, id != 6);
lib/test_xarray.c-540-	}
--
lib/test_xarray.c=545=static noinline void check_xas_erase(struct xarray *xa)
--
lib/test_xarray.c-573-		xas_for_each(&xas, entry, ULONG_MAX) {
lib/test_xarray.c:574:			XA_BUG_ON(xa, entry != xa_mk_index(j));
lib/test_xarray.c-575-			xas_store(&xas, NULL);
--
lib/test_xarray.c-578-		xas_unlock(&xas);
lib/test_xarray.c:579:		XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-580-	}
--
lib/test_xarray.c=584=static noinline void check_multi_store_1(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-591-	xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
lib/test_xarray.c:592:	XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(index));
lib/test_xarray.c:593:	XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(index));
lib/test_xarray.c:594:	XA_BUG_ON(xa, xa_load(xa, max) != NULL);
lib/test_xarray.c:595:	XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
lib/test_xarray.c-596-
lib/test_xarray.c-597-	xas_lock(&xas);
lib/test_xarray.c:598:	XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index));
lib/test_xarray.c-599-	xas_unlock(&xas);
lib/test_xarray.c:600:	XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(min));
lib/test_xarray.c:601:	XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(min));
lib/test_xarray.c:602:	XA_BUG_ON(xa, xa_load(xa, max) != NULL);
lib/test_xarray.c:603:	XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
lib/test_xarray.c-604-
lib/test_xarray.c-605-	xa_erase_index(xa, min);
lib/test_xarray.c:606:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-607-}
--
lib/test_xarray.c=609=static noinline void check_multi_store_2(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-615-	xas_lock(&xas);
lib/test_xarray.c:616:	XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(1)) != xa_mk_value(0));
lib/test_xarray.c:617:	XA_BUG_ON(xa, xas.xa_index != index);
lib/test_xarray.c:618:	XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
lib/test_xarray.c-619-	xas_unlock(&xas);
lib/test_xarray.c:620:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-621-}
--
lib/test_xarray.c=623=static noinline void check_multi_store_3(struct xarray *xa, unsigned long index,
--
lib/test_xarray.c-633-	xas_for_each(&xas, entry, ULONG_MAX) {
lib/test_xarray.c:634:		XA_BUG_ON(xa, entry != xa_mk_index(index));
lib/test_xarray.c-635-		n++;
lib/test_xarray.c-636-	}
lib/test_xarray.c:637:	XA_BUG_ON(xa, n != 1);
lib/test_xarray.c-638-	xas_set(&xas, index + 1);
lib/test_xarray.c-639-	xas_for_each(&xas, entry, ULONG_MAX) {
lib/test_xarray.c:640:		XA_BUG_ON(xa, entry != xa_mk_index(index));
lib/test_xarray.c-641-		n++;
lib/test_xarray.c-642-	}
lib/test_xarray.c:643:	XA_BUG_ON(xa, n != 2);
lib/test_xarray.c-644-	xas_unlock(&xas);
--
lib/test_xarray.c=650=static noinline void check_multi_store(struct xarray *xa)
--
lib/test_xarray.c-657-	xa_store_order(xa, 0, 1, xa_mk_value(0), GFP_KERNEL);
lib/test_xarray.c:658:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
lib/test_xarray.c:659:	XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
lib/test_xarray.c:660:	XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
lib/test_xarray.c-661-	rcu_read_lock();
lib/test_xarray.c:662:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 2);
lib/test_xarray.c:663:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
lib/test_xarray.c-664-	rcu_read_unlock();
--
lib/test_xarray.c-667-	xa_store(xa, 3, xa, GFP_KERNEL);
lib/test_xarray.c:668:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
lib/test_xarray.c:669:	XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
lib/test_xarray.c:670:	XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
lib/test_xarray.c-671-	rcu_read_lock();
lib/test_xarray.c:672:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 3);
lib/test_xarray.c:673:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
lib/test_xarray.c-674-	rcu_read_unlock();
--
lib/test_xarray.c-677-	xa_store_order(xa, 0, 2, xa_mk_value(1), GFP_KERNEL);
lib/test_xarray.c:678:	XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(1));
lib/test_xarray.c:679:	XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(1));
lib/test_xarray.c:680:	XA_BUG_ON(xa, xa_load(xa, 2) != xa_mk_value(1));
lib/test_xarray.c:681:	XA_BUG_ON(xa, xa_load(xa, 3) != xa_mk_value(1));
lib/test_xarray.c:682:	XA_BUG_ON(xa, xa_load(xa, 4) != NULL);
lib/test_xarray.c-683-	rcu_read_lock();
lib/test_xarray.c:684:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 4);
lib/test_xarray.c:685:	XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 4);
lib/test_xarray.c-686-	rcu_read_unlock();
--
lib/test_xarray.c-689-	xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
lib/test_xarray.c:690:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-691-
--
lib/test_xarray.c-695-	xa_store_order(xa, 0, 2, NULL, GFP_KERNEL);
lib/test_xarray.c:696:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-697-
--
lib/test_xarray.c-705-				if ((i < k) && (j < k))
lib/test_xarray.c:706:					XA_BUG_ON(xa, entry != NULL);
lib/test_xarray.c-707-				else
lib/test_xarray.c:708:					XA_BUG_ON(xa, entry != xa_mk_index(j));
lib/test_xarray.c-709-			}
--
lib/test_xarray.c-711-			xa_erase(xa, 0);
lib/test_xarray.c:712:			XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-713-		}
--
lib/test_xarray.c=732=static noinline void check_xa_multi_store_adv_add(struct xarray *xa,
--
lib/test_xarray.c-740-	/* users are responsible for index alignemnt to the order when adding */
lib/test_xarray.c:741:	XA_BUG_ON(xa, index & (nrpages - 1));
lib/test_xarray.c-742-
--
lib/test_xarray.c-755-		 */
lib/test_xarray.c:756:		XA_BUG_ON(xa, xas_error(&xas) && xas_error(&xas) != -ENOMEM);
lib/test_xarray.c-757-	} while (xas_nomem(&xas, GFP_KERNEL));
lib/test_xarray.c-758-
lib/test_xarray.c:759:	XA_BUG_ON(xa, xas_error(&xas));
lib/test_xarray.c:760:	XA_BUG_ON(xa, xa_load(xa, index) != p);
lib/test_xarray.c-761-}
--
lib/test_xarray.c=817=static noinline void check_xa_multi_store_adv(struct xarray *xa,
--
lib/test_xarray.c-832-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:833:		XA_BUG_ON(xa, test_get_entry(xa, base + i) != &some_val);
lib/test_xarray.c-834-
lib/test_xarray.c:835:	XA_BUG_ON(xa, test_get_entry(xa, next_index) != NULL);
lib/test_xarray.c-836-
--
lib/test_xarray.c-838-	check_xa_multi_store_adv_add(xa, next_index, 0, &some_val_2);
lib/test_xarray.c:839:	XA_BUG_ON(xa, test_get_entry(xa, next_index) != &some_val_2);
lib/test_xarray.c-840-
--
lib/test_xarray.c-847-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:848:		XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2);
lib/test_xarray.c-849-
--
lib/test_xarray.c-851-	check_xa_multi_store_adv_delete(xa, base, order);
lib/test_xarray.c:852:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-853-
--
lib/test_xarray.c-861-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:862:		XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL);
lib/test_xarray.c-863-
lib/test_xarray.c-864-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:865:		XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2);
lib/test_xarray.c-866-
lib/test_xarray.c-867-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:868:		XA_BUG_ON(xa, test_get_entry(xa, next_next_index + i) != NULL);
lib/test_xarray.c-869-
lib/test_xarray.c-870-	check_xa_multi_store_adv_delete(xa, next_index, order);
lib/test_xarray.c:871:	XA_BUG_ON(xa, !xa_empty(xa));
lib/test_xarray.c-872-
--
lib/test_xarray.c-877-	for (i = 0; i < nrpages; i++)
lib/test_xarray.c:878:		XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL);

]

gemini-3.6-flash

							input: 28009
							output: 34
							thoughts: 2153
						

**Patch Analysis and Code Style Review**

Okay, so the initial check reveals the expected presence of `XA_BUG_ON` throughout `lib/test_xarray.c`, roughly 1200 times, which is anticipated for the test assertions within that file. The warnings from `checkpatch` regarding `XA_BUG_ON` are not of concern in this context.

Now, let's dive deeper into the patch itself. The first part introduces a new function, `check_multi_find_4`, into `lib/test_xarray.c`.  I need to ensure the logic and new test are sound, but the immediate concern that catches my eye is the formatting within the added code in `lib/xarray.c`. Specifically, I'm focusing on the indentation of the added `else if` block within `xas_find`.

The existing structure has the following pattern:

```c
} else if (!xas->xa_node->shift &&
           xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
```

And now we have:

```c
} else if (xas->xa_node->shift &&
	   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
```

Immediately, the indentation of the second line in the added `else if` is concerning. Based on the Linux kernel's coding style, an 8-space tab should be used.  The continuation line `xas->xa_offset` needs to be aligned under `xas->xa_node->shift` in the second `else if` statement.  Doing the math, if we consider a tab size of 8, we have:

*   `}` (1) + ` else if (` (10) = 11 spaces.  Therefore, line 2 should be at least 27 spaces.
*   Two tabs = 16 spaces.
*   16 + 11 = 27 spaces total needed.

The current diff appears to be using a mixture of tabs and spaces, giving an indentation of 19 spaces which is incorrect.  It is important to align it properly to maintain consistency with the coding style and readability.  The question is why the added lines are not adhering to the kernel's coding style, and whether this is a simple oversight or indicates a problem with the editor or formatting tools used. This needs to be clarified to prevent similar issues from reoccurring and to maintain code consistency. Therefore, I need to check whether it's tabs, spaces, or a combination. The added lines should be corrected.  I'll need to double-check that the continuation of `xas->xa_offset` is correctly aligned under `xas->xa_node->shift`. I am going to verify the whole indentation in that code block.

log-in to see details

map[Expression:\t\t} else if \( PathPrefix:lib/xarray.c]

map[Output:]

gemini-3.6-flash

							input: 30820
							output: 28
							thoughts: 18
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing `lib/xarray.c` for `else if` Constructs**

Okay, so I'm diving into `lib/xarray.c`. My primary interest at the moment is understanding the conditional logic flow within this file, specifically focusing on how `else if` constructs are employed. This likely points to potential areas of complex decision-making within the Xarray implementation that might warrant close scrutiny. I want to quickly identify where nested branching occurs, as those locations are often hotspots for potential performance bottlenecks, subtle bugs, or areas where refactoring for clarity could pay dividends. A targeted search for `else if` will quickly get me to the relevant sections.

map[Expression:else if PathPrefix:lib/xarray.c]

map[Output:lib/xarray.c=38=static inline void xas_lock_type(struct xa_state *xas, unsigned int lock_type)
--
lib/xarray.c-41-		xas_lock_irq(xas);
lib/xarray.c:42:	else if (lock_type == XA_LOCK_BH)
lib/xarray.c-43-		xas_lock_bh(xas);
--
lib/xarray.c=48=static inline void xas_unlock_type(struct xa_state *xas, unsigned int lock_type)
--
lib/xarray.c-51-		xas_unlock_irq(xas);
lib/xarray.c:52:	else if (lock_type == XA_LOCK_BH)
lib/xarray.c-53-		xas_unlock_bh(xas);
--
lib/xarray.c=567=static int xas_expand(struct xa_state *xas, void *head)
--
lib/xarray.c-579-		return shift + XA_CHUNK_SHIFT;
lib/xarray.c:580:	} else if (xa_is_node(head)) {
lib/xarray.c-581-		node = xa_to_node(head);
--
lib/xarray.c-606-				}
lib/xarray.c:607:			} else if (xa_marked(xa, mark)) {
lib/xarray.c-608-				node_set_mark(node, 0, mark);
--
lib/xarray.c=647=static void *xas_create(struct xa_state *xas, bool allow_root)
--
lib/xarray.c-667-		slot = &xa->xa_head;
lib/xarray.c:668:	} else if (xas_error(xas)) {
lib/xarray.c-669-		return NULL;
lib/xarray.c:670:	} else if (node) {
lib/xarray.c-671-		unsigned int offset = xas->xa_offset;
--
lib/xarray.c-690-			rcu_assign_pointer(*slot, xa_mk_node(node));
lib/xarray.c:691:		} else if (xa_is_node(entry)) {
lib/xarray.c-692-			node = xa_to_node(entry);
--
lib/xarray.c=1393=void *xas_find(struct xa_state *xas, unsigned long max)
--
lib/xarray.c-1404-		return set_bounds(xas);
lib/xarray.c:1405:	} else if (xas->xa_node == XAS_RESTART) {
lib/xarray.c-1406-		entry = xas_load(xas);
--
lib/xarray.c-1408-			return entry;
lib/xarray.c:1409:	} else if (!xas->xa_node->shift &&
lib/xarray.c-1410-		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
--
lib/xarray.c=1462=void *xas_find_marked(struct xa_state *xas, unsigned long max, xa_mark_t mark)
--
lib/xarray.c-1475-		goto out;
lib/xarray.c:1476:	} else if (xas_top(xas->xa_node)) {
lib/xarray.c-1477-		advance = false;
--
lib/xarray.c=1552=void *xas_find_conflict(struct xa_state *xas)
--
lib/xarray.c-1580-				break;
lib/xarray.c:1581:		} else if (xas->xa_offset == XA_CHUNK_MASK) {
lib/xarray.c-1582-			xas->xa_offset = xas->xa_node->offset;
--
lib/xarray.c=2426=void xa_dump_index(unsigned long index, unsigned int shift)
--
lib/xarray.c-2429-		pr_info("%lu: ", index);
lib/xarray.c:2430:	else if (shift >= BITS_PER_LONG)
lib/xarray.c-2431-		pr_info("0-%lu: ", ~0UL);
--
lib/xarray.c=2436=void xa_dump_entry(const void *entry, unsigned long index, unsigned long shift)
--
lib/xarray.c-2453-		}
lib/xarray.c:2454:	} else if (xa_is_value(entry))
lib/xarray.c-2455-		pr_cont("value %ld (0x%lx) [%px]\n", xa_to_value(entry),
lib/xarray.c-2456-						xa_to_value(entry), entry);
lib/xarray.c:2457:	else if (!xa_is_internal(entry))
lib/xarray.c-2458-		pr_cont("%px\n", entry);
lib/xarray.c:2459:	else if (xa_is_retry(entry))
lib/xarray.c-2460-		pr_cont("retry (%ld)\n", xa_to_internal(entry));
lib/xarray.c:2461:	else if (xa_is_sibling(entry))
lib/xarray.c-2462-		pr_cont("sibling (slot %ld)\n", xa_to_sibling(entry));
lib/xarray.c:2463:	else if (xa_is_zero(entry))
lib/xarray.c-2464-		pr_cont("zero (%ld)\n", xa_to_internal(entry));
]

gemini-3.6-flash

							input: 32509
							output: 9
							thoughts: 2506
						

**Analyzing Indentation in `lib/xarray.c` for Kernel Coding Style Compliance**

Okay, let's dive into this code and ensure the formatting aligns perfectly with kernel standards, as I'm tasked to do.  The initial focus is on lines 1409 and 1410 in `lib/xarray.c`. The core of the problem seems to be the indentation, specifically, the mix of tabs and spaces, and how continuation lines are indented. I'm going to carefully read these lines, and related ones, using `read-file` to get a precise character count.

My immediate concern is the alignment of code on line 1409 and the continuation of that code on 1410.  I'm seeing `\t\t` on both lines. I'm going to look at how these indentations align with the surrounding code and with any changes introduced. I need to understand whether we have a consistent use of tabs (8 spaces) or if there's a mix.

I've got to determine why the patch introduced differing indentations.  On closer look, line 1410 has `\t\t    ` (2 tabs + 4 spaces), but it seems inconsistent with how it lines up with surrounding code, the previous line's formatting and the new code. The new line 1413 has `\t\t   ` (2 tabs + 3 spaces). Is this intentional or accidental?

Based on the alignment, the original code had a tab-based indentation, but something with the patch is causing a mixed set of tabs and spaces, or seemingly a different indentation, which could be an indentation level error in the patch. I'll need to count characters and spaces in these lines. The indentation must align correctly if it's meant to be a continuation line.

I'm checking the column positions of various parts of the line in relation to each other, especially the `xas->xa_offset` expression. The goal is to verify consistency in the indentation.

I'm double-checking the indentation style and spacing after `else if` to see what is proper code. I'm going through the added code, and comparing with the existing code, to ensure consistency of indent style, specifically how a continuation line should be properly indented.

I'm thinking: is the 4-space indent on line 1410 supposed to be an extra indent level, or is it a continuation of the previous line? And if so, how does that apply to the rest of the file? I want to ensure I understand *why* the extra space is present.

I've examined the code carefully and determined the spacing should be consistent, and the additional spaces are what make the line a continuation, which should line up under `else if`.

I'll now rerun `checkpatch` to confirm that all whitespace issues are resolved.  The previous output showed some warnings, and I'll confirm that the warnings are not related to formatting, and that the code meets all style requirements and there are 0 errors.

Now, let's double-check all the files mentioned, `lib/test_xarray.c` and `lib/xarray.c`, to ensure that there are no formatting issues that require remediation. I want to look for trailing spaces, and proper indentation of function blocks.

I'm reviewing the patch instructions: "Your objective is purely formatting: you must ensure the patch complies with the kernel's coding style, conforms to the surrounding code rules, and passes checkpatch.pl, while preserving the code logic exactly as it is."  So I should stop after formatting is done and `checkpatch` is happy. I should not question the changes.

I re-run `checkpatch` just to be sure, and I see there are 0 errors, 5 warnings, 61 lines checked. The warnings are `XA_BUG_ON` which are not formatting-related and can be safely ignored.  Therefore, all formatting steps are complete!

map[Output:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
]

gemini-3.6-flash

							input: 36370
							output: 211
							thoughts: 70
						

**Ready to Finalize**

Okay, here's the deal. This patch I've been reviewing is golden. It's already playing by all the rules – Linux kernel coding style, the surrounding code conventions, everything. I've run `checkpatch.pl`, and it's given me the thumbs up; no errors. And, critically, the core logic is intact. So, based on the instructions, "If the code already conforms...", I'm in the clear. Time to wrap this up. I'm ready to craft the final response. This one's a done deal.

map[PatchDiff:diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 5ca0aefee..590fd1c85 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1357,6 +1357,45 @@ static noinline void check_find_4(struct xarray *xa)
 	xa_erase_index(xa, ULONG_MAX);
 }
 
+static noinline void check_multi_find_4(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	void *entry;
+
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(128));
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+
+	xas_set(&xas, 0);
+	xa_store_order(xa, 0, 7, xa_mk_index(0), GFP_KERNEL);
+	xa_store_index(xa, 128, xa_mk_index(128), GFP_KERNEL);
+	xas_split_alloc(&xas, xa_mk_index(0), 7, GFP_KERNEL);
+
+	rcu_read_lock();
+	entry = xas_find(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+
+	xas_lock(&xas);
+	xas_split(&xas, xa_mk_index(0), 7);
+	xas_unlock(&xas);
+
+	entry = xas_next_entry(&xas, ULONG_MAX);
+	XA_BUG_ON(xa, entry != xa_mk_index(0));
+	XA_BUG_ON(xa, xas.xa_index != 64);
+	rcu_read_unlock();
+
+	xa_destroy(xa);
+}
+
 static noinline void check_find(struct xarray *xa)
 {
 	unsigned i;
@@ -1365,6 +1404,7 @@ static noinline void check_find(struct xarray *xa)
 	check_find_2(xa);
 	check_find_3(xa);
 	check_find_4(xa);
+	check_multi_find_4(xa);
 
 	for (i = 2; i < 10; i++)
 		check_multi_find_1(xa, i);
diff --git a/lib/xarray.c b/lib/xarray.c
index 9a8b49165..2b3f807a7 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1409,6 +1409,9 @@ void *xas_find(struct xa_state *xas, unsigned long max)
 	} else if (!xas->xa_node->shift &&
 		    xas->xa_offset != (xas->xa_index & XA_CHUNK_MASK)) {
 		xas->xa_offset = ((xas->xa_index - 1) & XA_CHUNK_MASK) + 1;
+	} else if (xas->xa_node->shift &&
+		   xas->xa_offset != get_offset(xas->xa_index, xas->xa_node)) {
+		xas->xa_offset = get_offset(xas->xa_index, xas->xa_node);
 	}
 
 	xas_next_offset(xas);
 TestError:]

map[CheckpatchOutput:WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#19: FILE: lib/test_xarray.c:1370:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#22: FILE: lib/test_xarray.c:1373:
+	XA_BUG_ON(xa, entry != xa_mk_index(128));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#34: FILE: lib/test_xarray.c:1385:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#41: FILE: lib/test_xarray.c:1392:
+	XA_BUG_ON(xa, entry != xa_mk_index(0));

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#42: FILE: lib/test_xarray.c:1393:
+	XA_BUG_ON(xa, xas.xa_index != 64);

total: 0 errors, 5 warnings, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
 NeedRefinement:true]