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locking/percpu-rwsem: Add percpu_is_write_locked() and percpu_is_read_locked()

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Implement simple accessors to probe percpu-rwsem's locked state:
percpu_is_write_locked(), percpu_is_read_locked().

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20220829124719.675715-11-elver@google.com
This commit is contained in:
Marco Elver
2022-08-29 14:47:15 +02:00
committed by Peter Zijlstra
parent f95e5a3d59
commit 01fe8a3f81
2 changed files with 12 additions and 0 deletions
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6
include/linux/percpu-rwsem.h
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@@ -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 *);