oom_reaper: avoid pointless atomic_inc_not_zero usage.
authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fri, 24 Jun 2016 21:48:38 +0000 (14:48 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 25 Jun 2016 00:23:52 +0000 (17:23 -0700)
commit9df10fb7b80bc2f540956ba01b5e7ee1012001a5
treea64cab11f81e017ca0b27d785e6922d008231403
parent491a1c65ae498dea0e39b24a46e528a78a8532ed
oom_reaper: avoid pointless atomic_inc_not_zero usage.

Since commit 36324a990cf5 ("oom: clear TIF_MEMDIE after oom_reaper
managed to unmap the address space") changed to use find_lock_task_mm()
for finding a mm_struct to reap, it is guaranteed that mm->mm_users > 0
because find_lock_task_mm() returns a task_struct with ->mm != NULL.
Therefore, we can safely use atomic_inc().

Link: http://lkml.kernel.org/r/1465024759-8074-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/oom_kill.c