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

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Date:	Fri, 22 Jun 2012 19:57:22 +0800
From:	Wanpeng Li <liwp.linux@...il.com>
To:	"linux-mm@...ck.org" <linux-mm@...ck.org>
Cc:	<cgroups@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Han Ying <yinghan@...gle.com>,
	Glauber Costa <glommer@...allels.com>,
	Tejun Heo <tj@...nel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Wanpeng Li <liwp.linux@...il.com>
Subject: [PATCH 1/2] memcg: use existing function to judge root mem cgroup

From: Wanpeng Li <liwp@...ux.vnet.ibm.com>

Signed-off-by: Wanpeng Li <liwp.linux@...il.com>
---
 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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