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mm: oom_kill: remove unnecessary locking in oom_enable() 

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>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Johannes Weiner 2015-06-24 16:57:04 -07:00 committed by Linus Torvalds
parent febd5949e1
commit 3f5ab8cfbf
1 changed files with 0 additions and 2 deletions
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mm/oom_kill.c
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@ -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))