linux-kernel - [RFC][PATCH 2/7 v2] memcg: fix error code in hugetlb_force_memcg

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Message-ID: <4F9A33CB.8040304@jp.fujitsu.com>
Date:	Fri, 27 Apr 2012 14:51:07 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Glauber Costa <glommer@...allels.com>,
	Tejun Heo <tj@...nel.org>, Han Ying <yinghan@...gle.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kamezawa.hiroyuki@...il.com
Subject: [RFC][PATCH 2/7 v2] memcg: fix error code in hugetlb_force_memcg_empty()

EBUSY should be returned.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 mm/hugetlb.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 17ae2e4..4dd6b39 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1922,8 +1922,11 @@ int hugetlb_force_memcg_empty(struct cgroup *cgroup)
 	int ret = 0, idx = 0;
 
 	do {
-		if (cgroup_task_count(cgroup) || !list_empty(&cgroup->children))
+		if (cgroup_task_count(cgroup)
+			|| !list_empty(&cgroup->children)) {
+			ret = -EBUSY;
 			goto out;
+		}
 		/*
 		 * If the task doing the cgroup_rmdir got a signal
 		 * we don't really need to loop till the hugetlb resource
-- 
1.7.4.1


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