linux-kernel - [PATCH v2] memory-hotplug: fix NR_FREE

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Message-ID: <509B75FF.6070806@cn.fujitsu.com>
Date:	Thu, 08 Nov 2012 17:06:07 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	linux-mm@...ck.org, lkml <linux-kernel@...r.kernel.org>
CC:	Jiang Liu <liuj97@...il.com>, Len Brown <len.brown@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Yasuaki ISIMATU <isimatu.yasuaki@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	lai jiangshan <laijs@...fujitsu.com>,
	Wen congyang <wency@...fujitsu.com>
Subject: [PATCH v2] memory-hotplug: fix NR_FREE_PAGES mismatch's fix


When a page is freed and put into pcp list, get_freepage_migratetype()
doesn't return MIGRATE_ISOLATE even if this pageblock is isolated.
So we should use get_freepage_migratetype() instead of mt to check
whether it is isolated.
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 027afd0..795875f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -667,7 +667,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
 			/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
 			__free_one_page(page, zone, 0, mt);
 			trace_mm_page_pcpu_drain(page, 0, mt);
-			if (likely(mt != MIGRATE_ISOLATE)) {
+			if (likely(get_pageblock_migratetype(page) != MIGRATE_ISOLATE)) {
 				__mod_zone_page_state(zone, NR_FREE_PAGES, 1);
 				if (is_migrate_cma(mt))
 					__mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1);
-- 
1.8.0
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