Messages in this thread Patch in this message | | | From | js1304@gmail ... | Subject | [PATCH 1/6] mm/page_alloc: fix same zone check in __pageblock_pfn_to_page() | Date | Mon, 14 Mar 2016 16:31:32 +0900 |
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From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
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@lge.com> --- 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
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