[patch 01/12] mm: oom_kill: remove unnecessary locking in oom_enable()

[Johannes Weiner <hannes@cmpxchg.org>]

Setting oom_killer_disabled to false is atomic, there is no need for
further synchronization with ongoing allocations trying to OOM-kill.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/oom_kill.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 2b665da1b3c9..73763e489e86 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -488,9 +488,7 @@ bool oom_killer_disable(void)
  */
 void oom_killer_enable(void)
 {
-	down_write(&oom_sem);
 	oom_killer_disabled = false;
-	up_write(&oom_sem);
 }
 
 #define K(x) ((x) << (PAGE_SHIFT-10))
-- 
2.3.3