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memcg: use rcu_dereference to access mm->owner 

mm->owner should be accessed with rcu_dereference().

Reported-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-04-21 12:24:41 -07:00 committed by Linus Torvalds
parent c12ddba093
commit e638c13940
1 changed files with 1 additions and 1 deletions
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2
include/linux/memcontrol.h
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@ -75,7 +75,7 @@ int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
{ {
struct mem_cgroup *mem; struct mem_cgroup *mem;
rcu_read_lock(); rcu_read_lock();
mem = mem_cgroup_from_task((mm)->owner); mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
rcu_read_unlock(); rcu_read_unlock();
return cgroup == mem; return cgroup == mem;
} }