linux-kernel - [PATCH next] memcg: remove PCG_FILE

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Message-ID: <alpine.LSU.2.00.1202282127110.4875@eggly.anvils>
Date:	Tue, 28 Feb 2012 21:28:40 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH next] memcg: remove PCG_FILE_MAPPED fix cosmetic fix

mem_cgroup_move_account() begins with "anon = PageAnon(page)", and
then anon is used thereafter: testing PageAnon(page) in the middle
makes the reader wonder if there's some race to guard against - no.

Signed-off-by: Hugh Dickins <hughd@...gle.com>
---

 mm/memcontrol.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 3.3-rc5-next/mm/memcontrol.c	2012-02-27 09:56:59.072001463 -0800
+++ linux/mm/memcontrol.c	2012-02-28 20:45:43.488100423 -0800
@@ -2560,7 +2560,7 @@ static int mem_cgroup_move_account(struc
 
 	move_lock_mem_cgroup(from, &flags);
 
-	if (!PageAnon(page) && page_mapped(page)) {
+	if (!anon && page_mapped(page)) {
 		/* Update mapped_file data for mem_cgroup */
 		preempt_disable();
 		__this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
--
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