mm/oom_kill.c: document oom_lock
Add comments describing oom_lock's scope. Requested-by: NDavid Rientjes <rientjes@google.com> Link: http://lkml.kernel.org/r/20180711120121.25635-1-mhocko@kernel.orgSigned-off-by: NMichal Hocko <mhocko@suse.com> Reviewed-by: NAndrew Morton <akpm@linux-foundation.org> Cc: David Rientjes <rientjes@google.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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