linux-kernel - [patch] memcg: charged pages always have valid per-memcg zone info

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Date:	Wed,  9 Feb 2011 11:44:35 +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] memcg: charged pages always have valid per-memcg zone info

page_cgroup_zoneinfo() will never return NULL for a charged page,
remove the check for it in mem_cgroup_get_reclaim_stat_from_page().

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

Andrew, this is a follow-up to 'memcg: no uncharged pages reach
page_cgroup_zoneinfo'.

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 686f1ce..6d007d6 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1017,9 +1017,6 @@ mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 	/* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
 	smp_rmb();
 	mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
-	if (!mz)
-		return NULL;
-
 	return &mz->reclaim_stat;
 }
 
-- 
1.7.4

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