tree 439c803ef6cdb6fde9a8dbef510506f519a50338
parent c01f46c7c725f0a1330673bc3c767b89a3b2dbc0
author Johannes Weiner <hannes@cmpxchg.org> 1418255070 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1418262068 -0800

mm: memcontrol: pull the NULL check from __mem_cgroup_same_or_subtree()

The NULL in mm_match_cgroup() comes from a possibly exiting mm->owner.  It
makes a lot more sense to check where it's looked up, rather than check
for it in __mem_cgroup_same_or_subtree() where it's unexpected.

No other callsite passes NULL to __mem_cgroup_same_or_subtree().

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>