From: Joonsoo Kim <iamjoonsoo....@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....@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
