mm,oom_reaper: don't call mmput_async() without atomic_inc_not_zero()

Commit e2fe145 ("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@I-love.SAKURA.ne.jp Signed-off-by: Tetsuo Handa <[email protected]> Acked-by: Michal Hocko <[email protected]> Cc: Arnd Bergmann <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
ambv · Jun 25, 2016 · 491a1c6 · 491a1c6
1 parent 63c04ee
commit 491a1c6
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
@@ -478,6 +478,7 @@ static bool __oom_reap_task(struct task_struct *tsk)
 	mm = p->mm;
 	if (!atomic_inc_not_zero(&mm->mm_users)) {
 		task_unlock(p);
+		mm = NULL;
 		goto unlock_oom;
 	}