linux-kernel - [patch 1/5] memcg: no uncharged pages reach page_cgroup

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Message-Id: <1296743166-9412-2-git-send-email-hannes@cmpxchg.org>
Date:	Thu,  3 Feb 2011 15:26:02 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: [patch 1/5] memcg: no uncharged pages reach page_cgroup_zoneinfo

All callsites check PCG_USED before passing pc->mem_cgroup, so the
latter is never NULL.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 mm/memcontrol.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e071d7e..85b4b5a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -370,9 +370,6 @@ page_cgroup_zoneinfo(struct page_cgroup *pc)
 	int nid = page_cgroup_nid(pc);
 	int zid = page_cgroup_zid(pc);
 
-	if (!mem)
-		return NULL;
-
 	return mem_cgroup_zoneinfo(mem, nid, zid);
 }
 
-- 
1.7.4

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