[PATCH 1/3] memcg: fix account leak at failure of memsw acconting.

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

This is required for 2.6.36-stable and later.
==
Commit 4b53433468c87794b523e4683fbd4e8e8aca1f63 removes
a cancel of charge at case: 
memory charge-> success.
mem+swap charge-> failure.

This leaks usage of memory. Fix it.

This patch is required for stable tree since 2.6.36.

CC: stable@kernel.org
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 mm/memcontrol.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6.38-rc2/mm/memcontrol.c
===================================================================
--- linux-2.6.38-rc2.orig/mm/memcontrol.c
+++ linux-2.6.38-rc2/mm/memcontrol.c
@@ -1832,6 +1832,7 @@ static int __mem_cgroup_do_charge(struct
 		if (likely(!ret))
 			return CHARGE_OK;
 
+		res_counter_uncharge(&mem->res, csize);
 		mem_over_limit = mem_cgroup_from_res_counter(fail_res, memsw);
 		flags |= MEM_CGROUP_RECLAIM_NOSWAP;
 	} else