tree 49bee7b2cfdf8fba2a543828369c9a9ebe865546
parent fcb2db81f89d0ff7ea0e3a3ca103ea59eb9449bd
author Hugh Dickins <hughd@google.com> 1324530287 +1100
committer Michal Hocko <mhocko@suse.cz> 1324980680 +0100

mm-memcg-lookup_page_cgroup-almost-never-returns-null fix

lookup_page_cgroup() returns NULL (or may return NULL) when
mem_cgroup_disabled(): stop oops in mem_cgroup_update_page_stat().  Let's
make it explicit for now, probably optimize such checks later.

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>