3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hillf Danton <redacted>

commit a41c58a6665cc995e237303b05db42100b71b65e upstream.

If the request is to create non-root group and we fail to meet it, we
should leave the root unchanged.

Signed-off-by: Hillf Danton <redacted>
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: KAMEZAWA Hiroyuki <redacted>
Acked-by: Michal Hocko <redacted>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Andrea Arcangeli <redacted>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 mm/memcontrol.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c

@@ -4963,9 +4963,9 @@ mem_cgroup_create(struct cgroup_subsys *
 		int cpu;
 		enable_swap_cgroup();
 		parent = NULL;
-		root_mem_cgroup = mem;
 		if (mem_cgroup_soft_limit_tree_init())
 			goto free_out;
+		root_mem_cgroup = mem;
 		for_each_possible_cpu(cpu) {
 			struct memcg_stock_pcp *stock =
 						&per_cpu(memcg_stock, cpu);

@@ -5004,7 +5004,6 @@ mem_cgroup_create(struct cgroup_subsys *
 	return &mem->css;
 free_out:
 	__mem_cgroup_free(mem);
-	root_mem_cgroup = NULL;
 	return ERR_PTR(error);
 }