Messages in this thread Patch in this message |  | | From | Joonsoo Kim <> | Subject | [RFC 06/16] mm/page_alloc: watch out zone range overlap | Date | Thu, 12 Feb 2015 16:32:10 +0900 |
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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@lge.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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