From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> There is a system that node's pfn are overlapped like as following. -----pfn--------> N0 N1 N2 N0 N1 N2 Therefore, we need to care this overlapping when iterating pfn range. In __pageblock_pfn_to_page(), there is a check for this but it's not sufficient. This check cannot distinguish the case that zone id is the same but node id is different. This patch fixes it. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> --- mm/page_alloc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 8120f07..93293b4 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1173,8 +1173,7 @@ struct page *__pageblock_pfn_to_page(unsigned long start_pfn, end_page = pfn_to_page(end_pfn); - /* This gives a shorter code than deriving page_zone(end_page) */ - if (page_zone_id(start_page) != page_zone_id(end_page)) + if (zone != page_zone(end_page)) return NULL; return start_page; -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>