From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m3.gw.fujitsu.co.jp ([10.0.50.73]) by fgwmail7.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id mB1CF0vJ032449 for (envelope-from kosaki.motohiro@jp.fujitsu.com); Mon, 1 Dec 2008 21:15:00 +0900 Received: from smail (m3 [127.0.0.1]) by outgoing.m3.gw.fujitsu.co.jp (Postfix) with ESMTP id 74E3B45DD7E for ; Mon, 1 Dec 2008 21:15:00 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (s3.gw.fujitsu.co.jp [10.0.50.93]) by m3.gw.fujitsu.co.jp (Postfix) with ESMTP id 54E6145DD7B for ; Mon, 1 Dec 2008 21:15:00 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 386881DB803B for ; Mon, 1 Dec 2008 21:15:00 +0900 (JST) Received: from m107.s.css.fujitsu.com (m107.s.css.fujitsu.com [10.249.87.107]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id E73061DB8037 for ; Mon, 1 Dec 2008 21:14:59 +0900 (JST) From: KOSAKI Motohiro Subject: [PATCH 05/11] memcg: add null check to page_cgroup_zoneinfo() In-Reply-To: <20081201205810.1CCA.KOSAKI.MOTOHIRO@jp.fujitsu.com> References: <20081201205810.1CCA.KOSAKI.MOTOHIRO@jp.fujitsu.com> Message-Id: <20081201211424.1CD9.KOSAKI.MOTOHIRO@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Date: Mon, 1 Dec 2008 21:14:59 +0900 (JST) Sender: owner-linux-mm@kvack.org Return-Path: To: LKML , linux-mm , Andrew Morton , Balbir Singh , KAMEZAWA Hiroyuki , Rik van Riel Cc: kosaki.motohiro@jp.fujitsu.com List-ID: if CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y, page_cgroup::mem_cgroup can be NULL. Therefore null checking is better. latter patch use this function. Signed-off-by: KOSAKI Motohiro --- mm/memcontrol.c | 3 +++ 1 file changed, 3 insertions(+) Index: b/mm/memcontrol.c =================================================================== --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -231,6 +231,9 @@ page_cgroup_zoneinfo(struct page_cgroup int nid = page_cgroup_nid(pc); int zid = page_cgroup_zid(pc); + if (!mem) + return NULL; + return mem_cgroup_zoneinfo(mem, nid, zid); } -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org