[PATCH 1/2] memcg: use existing function to judge root mem cgroup

[Wanpeng Li]

From: Wanpeng Li <liwp@xxxxxxxxxxxxxxxxxx>

Signed-off-by: Wanpeng Li <liwp.linux@xxxxxxxxx>
---
 mm/memcontrol.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f72b5e5..776fc57 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4873,7 +4873,7 @@ mem_cgroup_create(struct cgroup *cont)
 			goto free_out;
 
 	/* root ? */
-	if (cont->parent == NULL) {
+	if (!(mem_cgroup_is_root(cont))) {
 		int cpu;
 		enable_swap_cgroup();
 		parent = NULL;
-- 
1.7.9.5

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