diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2019-10-30 22:01:26 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-02-11 15:10:53 +0300 |
| commit | 1751060e2527462714359573a39dca10451ffbf8 (patch) | |
| tree | b0b07336c5f17d355e20c3c94c1ccee6a65bcd85 /kernel/locking | |
| parent | 810507fe6fd5ff3de429121adff49523fabb643a (diff) | |
| download | linux-1751060e2527462714359573a39dca10451ffbf8.tar.xz | |
locking/percpu-rwsem, lockdep: Make percpu-rwsem use its own lockdep_map
As preparation for replacing the embedded rwsem, give percpu-rwsem its
own lockdep_map.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Davidlohr Bueso <dbueso@suse.de>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Waiman Long <longman@redhat.com>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://lkml.kernel.org/r/20200131151539.927625541@infradead.org
Diffstat (limited to 'kernel/locking')
| -rw-r--r-- | kernel/locking/percpu-rwsem.c | 16 | ||||
| -rw-r--r-- | kernel/locking/rwsem.c | 4 | ||||
| -rw-r--r-- | kernel/locking/rwsem.h | 2 |
3 files changed, 16 insertions, 6 deletions
diff --git a/kernel/locking/percpu-rwsem.c b/kernel/locking/percpu-rwsem.c index 364d38a0c444..aa2b118d2f88 100644 --- a/kernel/locking/percpu-rwsem.c +++ b/kernel/locking/percpu-rwsem.c @@ -11,7 +11,7 @@ #include "rwsem.h" int __percpu_init_rwsem(struct percpu_rw_semaphore *sem, - const char *name, struct lock_class_key *rwsem_key) + const char *name, struct lock_class_key *key) { sem->read_count = alloc_percpu(int); if (unlikely(!sem->read_count)) @@ -19,9 +19,13 @@ int __percpu_init_rwsem(struct percpu_rw_semaphore *sem, /* ->rw_sem represents the whole percpu_rw_semaphore for lockdep */ rcu_sync_init(&sem->rss); - __init_rwsem(&sem->rw_sem, name, rwsem_key); + init_rwsem(&sem->rw_sem); rcuwait_init(&sem->writer); sem->readers_block = 0; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + debug_check_no_locks_freed((void *)sem, sizeof(*sem)); + lockdep_init_map(&sem->dep_map, name, key, 0); +#endif return 0; } EXPORT_SYMBOL_GPL(__percpu_init_rwsem); @@ -142,10 +146,12 @@ static bool readers_active_check(struct percpu_rw_semaphore *sem) void percpu_down_write(struct percpu_rw_semaphore *sem) { + rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_); + /* Notify readers to take the slow path. */ rcu_sync_enter(&sem->rss); - down_write(&sem->rw_sem); + __down_write(&sem->rw_sem); /* * Notify new readers to block; up until now, and thus throughout the @@ -168,6 +174,8 @@ EXPORT_SYMBOL_GPL(percpu_down_write); void percpu_up_write(struct percpu_rw_semaphore *sem) { + rwsem_release(&sem->dep_map, _RET_IP_); + /* * Signal the writer is done, no fast path yet. * @@ -183,7 +191,7 @@ void percpu_up_write(struct percpu_rw_semaphore *sem) /* * Release the write lock, this will allow readers back in the game. */ - up_write(&sem->rw_sem); + __up_write(&sem->rw_sem); /* * Once this completes (at least one RCU-sched grace period hence) the diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c index 0d9b6be9ecc8..30df8dff217b 100644 --- a/kernel/locking/rwsem.c +++ b/kernel/locking/rwsem.c @@ -1383,7 +1383,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem) /* * lock for writing */ -static inline void __down_write(struct rw_semaphore *sem) +inline void __down_write(struct rw_semaphore *sem) { long tmp = RWSEM_UNLOCKED_VALUE; @@ -1446,7 +1446,7 @@ inline void __up_read(struct rw_semaphore *sem) /* * unlock after writing */ -static inline void __up_write(struct rw_semaphore *sem) +inline void __up_write(struct rw_semaphore *sem) { long tmp; diff --git a/kernel/locking/rwsem.h b/kernel/locking/rwsem.h index 2534ce49f648..d0d33a59622d 100644 --- a/kernel/locking/rwsem.h +++ b/kernel/locking/rwsem.h @@ -6,5 +6,7 @@ extern void __down_read(struct rw_semaphore *sem); extern void __up_read(struct rw_semaphore *sem); +extern void __down_write(struct rw_semaphore *sem); +extern void __up_write(struct rw_semaphore *sem); #endif /* __INTERNAL_RWSEM_H */ |