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authorHugh Dickins <hugh@veritas.com>2008-08-12 15:08:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-12 16:07:28 -0700
commit9623e078c1f4692a91531af2f639ec8aff8f0472 (patch)
treeee2ab90d674accd462600d52b14b386df5d748a1 /mm/memcontrol.c
parent3ee1062b4ee82a56294808a065b64f4bc6781a56 (diff)
downloadblackbird-op-linux-9623e078c1f4692a91531af2f639ec8aff8f0472.tar.gz
blackbird-op-linux-9623e078c1f4692a91531af2f639ec8aff8f0472.zip
memcg: fix oops in mem_cgroup_shrink_usage
Got an oops in mem_cgroup_shrink_usage() when testing loop over tmpfs: yes, of course, loop0 has no mm: other entry points check but this didn't. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: 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>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 7056c3bdb478..0f1f7a7374ba 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -796,6 +796,8 @@ int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask)
if (mem_cgroup_subsys.disabled)
return 0;
+ if (!mm)
+ return 0;
rcu_read_lock();
mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
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