linux-kernel - [RFC 06/16] mm/page_alloc: watch out zone range overlap

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Date:	Thu, 12 Feb 2015 16:32:10 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Laura Abbott <lauraa@...eaurora.org>,
	Minchan Kim <minchan@...nel.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Hui Zhu <zhuhui@...omi.com>, Gioh Kim <gioh.kim@....com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Ritesh Harjani <ritesh.list@...il.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [RFC 06/16] mm/page_alloc: watch out zone range overlap

In the following patches, new zone, ZONE_CMA, will be introduced and
it would be overlapped with other zones. Currently, many places
iterating pfn range doesn't consider possibility of zone overlap and
this would cause a problem such as printing wrong statistics information.
To prevent this situation, this patch add some code to consider zone
overlapping before adding ZONE_CMA.

setup_zone_migrate_reserve() reserve some pages for specific zone so
should consider zone overlap.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/page_alloc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c784035..1c45934b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4040,8 +4040,8 @@ static void setup_zone_migrate_reserve(struct zone *zone)
 			continue;
 		page = pfn_to_page(pfn);
 
-		/* Watch out for overlapping nodes */
-		if (page_to_nid(page) != zone_to_nid(zone))
+		/* Watch out for overlapping zones */
+		if (page_zone(page) != zone)
 			continue;
 
 		block_migratetype = get_pageblock_migratetype(page);
-- 
1.7.9.5

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