memcg: don't initialize kmem-cache destroying work for root caches
commit3e6b11df245180949938734bc192eaf32f3a06b3
authorAndrey Vagin <avagin@openvz.org>
Tue, 13 Aug 2013 23:00:47 +0000 (13 16:00 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 14 Aug 2013 00:57:47 +0000 (13 17:57 -0700)
treedb13eaaf91039956b19abe65ef53cfb04066274d
parent584d88b2cd3b60507e708d2452651e4d3caa1b81
memcg: don't initialize kmem-cache destroying work for root caches

struct memcg_cache_params has a union.  Different parts of this union
are used for root and non-root caches.  A part with destroying work is
used only for non-root caches.

I fixed the same problem in another place v3.9-rc1-16204-gf101a94, but
didn't notice this one.

This patch fixes the kernel panic:

[   46.848187] BUG: unable to handle kernel paging request at 000000fffffffeb8
[   46.849026] IP: [<ffffffff811a484c>] kmem_cache_destroy_memcg_children+0x6c/0xc0
[   46.849092] PGD 0
[   46.849092] Oops: 0000 [#1] SMP
...

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Cc: Glauber Costa <glommer@openvz.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: <stable@vger.kernel.org> [3.9.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/memcontrol.c