[07/11] sh, rwsem: provide __down_write_killable
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Message ID 1459508695-14915-8-git-send-email-mhocko@kernel.org
State New
Headers show

Commit Message

Michal Hocko April 1, 2016, 11:04 a.m. UTC
From: Michal Hocko <mhocko@suse.com>

which 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(+)

Patch
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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;