[RFC 07/12] sh, rwsem: provide __down_write_killable
From: Michal Hocko <mhocko@kernel.org>
Date: 2016-02-02 20:20:41
Also in:
linux-arch, linux-s390, linux-sh, lkml, sparclinux
Subsystem:
superh, the rest · Maintainers:
Yoshinori Sato, Rich Felker, John Paul Adrian Glaubitz, Linus Torvalds
From: Michal Hocko <mhocko@suse.com> which is uses the same fast path as __down_write except it falls back to rwsem_down_write_failed_killable slow path and return -EINTR if killed. Signed-off-by: Michal Hocko <mhocko@suse.com> --- arch/sh/include/asm/rwsem.h | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/arch/sh/include/asm/rwsem.h b/arch/sh/include/asm/rwsem.h
index f6c951c7a875..8a457b83d2a5 100644
--- a/arch/sh/include/asm/rwsem.h
+++ b/arch/sh/include/asm/rwsem.h@@ -54,6 +54,19 @@ static inline void __down_write(struct rw_semaphore *sem) rwsem_down_write_failed(sem); } +static inline int __down_write_killable(struct rw_semaphore *sem) +{ + int tmp; + + tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS, + (atomic_t *)(&sem->count)); + if (tmp != RWSEM_ACTIVE_WRITE_BIAS) + if (IS_ERR(rwsem_down_write_failed_killable(sem))) + return -EINTR; + + return 0; +} + static inline int __down_write_trylock(struct rw_semaphore *sem) { int tmp;
--
2.7.0