mm: memcontrol: pull the NULL check from __mem_cgroup_same_or_subtree()
authorJohannes Weiner <hannes@cmpxchg.org>
Wed, 10 Dec 2014 23:44:30 +0000 (15:44 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 11 Dec 2014 01:41:08 +0000 (17:41 -0800)
commit413918bb61b4fa027baa3e79546c47f15e4b9ea8
tree439c803ef6cdb6fde9a8dbef510506f519a50338
parentc01f46c7c725f0a1330673bc3c767b89a3b2dbc0
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>
include/linux/memcontrol.h
mm/memcontrol.c