mm: memcontrol: don't pass a NULL memcg to mem_cgroup_end_move()

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mem_cgroup_end_move() checks if the passed memcg is NULL, along with a
lengthy comment to explain why this seemingly non-sensical situation is
even possible.

Check in cancel_attach() itself whether can_attach() set up the move
context or not, it's a lot more obvious from there.  Then remove the check
and comment in mem_cgroup_end_move().

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-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>

...

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Johannes Weiner 2014-12-10 15:44:08 -08:00 • committed by Linus Torvalds

parent 354a4783a2

commit 4e2f245d38

1 changed files with 3 additions and 7 deletions

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mm/memcontrol.c

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