linux-kernel - [PATCH 3/2][BUGFIX] fix memory isolation notifier return value check

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Message-Id: <20100903165713.88249349.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 3 Sep 2010 16:57:13 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	Haicheng Li <haicheng.li@...ux.intel.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mel Gorman <mel@...ux.vnet.ibm.com>
Subject: [PATCH 3/2][BUGFIX] fix memory isolation notifier return value
 check

Sorry, the 3rd patch for this set.
==

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Even if notifier cannot find any pages, it doesn't mean
no pages are available...(For example, there is no notifier.)
Anyway, we check all pages in the range, later.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 mm/page_alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: mmotm-0827/mm/page_alloc.c
===================================================================
--- mmotm-0827.orig/mm/page_alloc.c
+++ mmotm-0827/mm/page_alloc.c
@@ -5360,7 +5360,7 @@ int set_migratetype_isolate(struct page 
 	 */
 	notifier_ret = memory_isolate_notify(MEM_ISOLATE_COUNT, &arg);
 	notifier_ret = notifier_to_errno(notifier_ret);
-	if (notifier_ret || !arg.pages_found)
+	if (notifier_ret)
 		goto out;
 	immobile = __count_unmovable_pages(zone ,page);
 

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