From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Subject: mm,oom_reaper: don't call mmput_async() without atomic_inc_not_zero()
Commit e2fe14564d3316d1 ("oom_reaper: close race with exiting task")
reduced frequency of needlessly selecting next OOM victim, but was
calling mmput_async() when atomic_inc_not_zero() failed.
Link: http://lkml.kernel.org/r/1464423365-5555-1-git-send-email-penguin-kernel@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/oom_kill.c | 1 +
1 file changed, 1 insertion(+)
diff -puN mm/oom_kill.c~mmoom_reaper-dont-call-mmput_async-without-atomic_inc_not_zero mm/oom_kill.c
--- a/mm/oom_kill.c~mmoom_reaper-dont-call-mmput_async-without-atomic_inc_not_zero
+++ a/mm/oom_kill.c
@@ -478,6 +478,7 @@ static bool __oom_reap_task(struct task_
mm = p->mm;
if (!atomic_inc_not_zero(&mm->mm_users)) {
task_unlock(p);
+ mm = NULL;
goto unlock_oom;
}
_
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