Messages in this thread Patch in this message | | | Date | Wed, 6 Aug 2008 15:15:08 +0100 (BST) | From | Hugh Dickins <> | Subject | [PATCH] memcg: fix oops in mem_cgroup_shrink_usage |
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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> ---
mm/memcontrol.c | 2 ++ 1 file changed, 2 insertions(+)
--- 2.6.27-rc2/mm/memcontrol.c 2008-08-06 08:36:20.000000000 +0100 +++ linux/mm/memcontrol.c 2008-08-06 09:05:26.000000000 +0100 @@ -796,6 +796,8 @@ int mem_cgroup_shrink_usage(struct mm_st 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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