On Thu, 15 Nov 2018 at 17:45, Chris Wilson <ch...@chris-wilson.co.uk> wrote:
>
> lockdep insists that if we give a lock a subclass, it must be used.
> Failure to do so triggers a self-consistency check when reading
> lockdep_stats:
>
> [ 49.902002] DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) !=
> nr_unused)
> [ 49.902009] WARNING: CPU: 3 PID: 383 at kernel/locking/lockdep_proc.c:249
> lockdep_stats_show+0x984/0xa10
> [ 49.902026] Modules linked in: nls_ascii nls_cp437 vfat fat
> crct10dif_pclmul crc32_pclmul crc32c_intel aesni_intel aes_x86_64 crypto_simd
> cryptd glue_helper intel_cstate intel_uncore intel_rapl_perf intel_gtt
> efivars prime_numbers ahci libahci i2c_i801 video button efivarfs [last
> unloaded: drm_kms_helper]
> [ 49.902059] CPU: 3 PID: 383 Comm: cat Tainted: G U
> 4.20.0-rc2+ #304
> [ 49.902068] Hardware name: Intel Corporation NUC7i5BNK/NUC7i5BNB, BIOS
> BNKBL357.86A.0052.2017.0918.1346 09/18/2017
> [ 49.902079] RIP: 0010:lockdep_stats_show+0x984/0xa10
> [ 49.902086] Code: 00 85 c0 0f 84 aa f8 ff ff 8b 05 77 37 e2 00 85 c0 0f 85
> 9c f8 ff ff 48 c7 c6 e0 57 bc 81 48 c7 c7 28 30 bb 81 e8 6b 77 fa ff <0f> 0b
> e9 82 f8 ff ff 48 c7 44 24 50 00 00 00 00 45 31 e4 31 db 31
> [ 49.902103] RSP: 0018:ffffc90000247d58 EFLAGS: 00010292
> [ 49.902110] RAX: 0000000000000044 RBX: 00000000000002f0 RCX:
> 0000000000000000
> [ 49.902118] RDX: 0000000000000002 RSI: 0000000000000001 RDI:
> ffffffff810b3464
> [ 49.902126] RBP: 0000000000000039 R08: 0000000000000002 R09:
> 0000000000000000
> [ 49.902133] R10: 0000000000000000 R11: 0000000000000000 R12:
> 0000000000007ead
> [ 49.902141] R13: 0000000000000001 R14: ffff88884c021000 R15:
> 0000000000000097
> [ 49.902150] FS: 00007fb347e66540(0000) GS:ffff88885e600000(0000)
> knlGS:0000000000000000
> [ 49.902159] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 49.902165] CR2: 00007fb347aeb000 CR3: 00000008544bd005 CR4:
> 00000000001606e0
>
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
> Cc: Michał Winiarski <michal.winiar...@intel.com>
> Cc: Matthew Auld <matthew.a...@intel.com>
Reviewed-by: Matthew Auld <matthew.a...@intel.com>
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