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| author |   Yuyang Du <duyuyang@gmail.com> | 2019-05-06 16:19:24 +0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2019-06-03 11:55:43 +0200 |
| commit | f6ec8829ac9d59b637366c13038f15d6f6156fe1 (patch) | |
| tree | 66564bff3b185212908d1c4c164d0304af2d9f12 /include/linux/lockdep.h | |
| parent | locking/lockdep: Use lockdep_init_task for task initiation consistently (diff) | |
| download | wireguard-linux-f6ec8829ac9d59b637366c13038f15d6f6156fe1.tar.xz wireguard-linux-f6ec8829ac9d59b637366c13038f15d6f6156fe1.zip | |
locking/lockdep: Define INITIAL_CHAIN_KEY for chain keys to start with
Chain keys are computed using Jenkins hash function, which needs an initial
hash to start with. Dedicate a macro to make this clear and configurable. A
later patch changes this initial chain key.
Signed-off-by: Yuyang Du <duyuyang@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: bvanassche@acm.org
Cc: frederic@kernel.org
Cc: ming.lei@redhat.com
Cc: will.deacon@arm.com
Link: https://lkml.kernel.org/r/20190506081939.74287-9-duyuyang@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/lockdep.h')
| -rw-r--r-- | include/linux/lockdep.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 5d05b8149f19..d4e69595dbd4 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -229,6 +229,7 @@ struct lock_chain { * bitfield and hitting the BUG in hlock_class(). */ #define MAX_LOCKDEP_KEYS ((1UL << MAX_LOCKDEP_KEYS_BITS) - 1) +#define INITIAL_CHAIN_KEY 0 struct held_lock { /* |