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percpu-rwsem: introduce percpu_down_read_trylock()

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Add percpu_down_read_trylock(), it will have the user soon.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
This commit is contained in:
Oleg Nesterov 2015-07-21 17:45:57 +02:00
parent 0e28e01f1e
commit 9287f6925a
2 changed files with 14 additions and 0 deletions
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1
include/linux/percpu-rwsem.h
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@ -16,6 +16,7 @@ struct percpu_rw_semaphore {
};
extern void percpu_down_read(struct percpu_rw_semaphore *);
extern int percpu_down_read_trylock(struct percpu_rw_semaphore *);
extern void percpu_up_read(struct percpu_rw_semaphore *);
extern void percpu_down_write(struct percpu_rw_semaphore *);