linux-kernel - [PATCH 10/21] memcg-add-null-check-to-page_cgroup

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Date:	Wed, 3 Dec 2008 13:58:42 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH  10/21] memcg-add-null-check-to-page_cgroup_zoneinfo.patch

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.

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Acked-by: Rik van Riel <riel@...hat.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
 mm/memcontrol.c |    3 +++
 1 file changed, 3 insertions(+)

Index: mmotm-2.6.28-Dec02/mm/memcontrol.c
===================================================================
--- mmotm-2.6.28-Dec02.orig/mm/memcontrol.c
+++ mmotm-2.6.28-Dec02/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);
 }
 

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