diff options
| author | Marco Elver <[email protected]> | 2022-08-29 14:47:15 +0200 |
|---|---|---|
| committer | Peter Zijlstra <[email protected]> | 2022-08-30 10:56:23 +0200 |
| commit | 01fe8a3f818e1074a9a95d624be4549ee7ea2b2b (patch) | |
| tree | 1990719e80d616d0b780490ea75e5c091292dcf3 /include/linux | |
| parent | f95e5a3d59011eec1257d0e76de1e1f8969d426f (diff) | |
locking/percpu-rwsem: Add percpu_is_write_locked() and percpu_is_read_locked()
Implement simple accessors to probe percpu-rwsem's locked state:
percpu_is_write_locked(), percpu_is_read_locked().
Signed-off-by: Marco Elver <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Dmitry Vyukov <[email protected]>
Acked-by: Ian Rogers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/percpu-rwsem.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h index 5fda40f97fe9..36b942b67b7d 100644 --- a/include/linux/percpu-rwsem.h +++ b/include/linux/percpu-rwsem.h @@ -121,9 +121,15 @@ static inline void percpu_up_read(struct percpu_rw_semaphore *sem) preempt_enable(); } +extern bool percpu_is_read_locked(struct percpu_rw_semaphore *); extern void percpu_down_write(struct percpu_rw_semaphore *); extern void percpu_up_write(struct percpu_rw_semaphore *); +static inline bool percpu_is_write_locked(struct percpu_rw_semaphore *sem) +{ + return atomic_read(&sem->block); +} + extern int __percpu_init_rwsem(struct percpu_rw_semaphore *, const char *, struct lock_class_key *); |