linux-kernel - [PATCH 5/6] memcg: simplify mem_cgroup_dirty

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Date:	Tue,  9 Nov 2010 01:24:30 -0800
From:	Greg Thelen <gthelen@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Johannes Weiner <hannes@...xchg.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Minchan Kim <minchan.kim@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Greg Thelen <gthelen@...gle.com>
Subject: [PATCH 5/6] memcg: simplify mem_cgroup_dirty_info()

Because mem_cgroup_page_stat() no longer returns negative numbers
to indicate failure, mem_cgroup_dirty_info() does not need to check
for such failures.

Signed-off-by: Greg Thelen <gthelen@...gle.com>
---
 mm/memcontrol.c |   14 +++-----------
 1 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f8df350..ccdbb7e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1258,8 +1258,6 @@ bool mem_cgroup_dirty_info(unsigned long sys_available_mem,
 	__mem_cgroup_dirty_param(&dirty_param, memcg);
 
 	value = mem_cgroup_page_stat(memcg, MEMCG_NR_DIRTYABLE_PAGES);
-	if (value < 0)
-		goto done;
 
 	available_mem = min((unsigned long)value, sys_available_mem);
 
@@ -1279,15 +1277,9 @@ bool mem_cgroup_dirty_info(unsigned long sys_available_mem,
 			(dirty_param.dirty_background_ratio *
 			       available_mem) / 100;
 
-	value = mem_cgroup_page_stat(memcg, MEMCG_NR_RECLAIM_PAGES);
-	if (value < 0)
-		goto done;
-	info->nr_reclaimable = value;
-
-	value = mem_cgroup_page_stat(memcg, MEMCG_NR_WRITEBACK);
-	if (value < 0)
-		goto done;
-	info->nr_writeback = value;
+	info->nr_reclaimable =
+		mem_cgroup_page_stat(memcg, MEMCG_NR_RECLAIM_PAGES);
+	info->nr_writeback = mem_cgroup_page_stat(memcg, MEMCG_NR_WRITEBACK);
 
 	valid = true;
 
-- 
1.7.3.1

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