From 9d43f5aec9506d98ad492a783aa8a18226c5d474 Mon Sep 17 00:00:00 2001 From: Joonsoo Kim Date: Thu, 19 May 2016 17:12:13 -0700 Subject: [PATCH] mm/page_owner: add zone range overlapping check There is a system thats node's pfns are overlapped as follows: -----pfn--------> N0 N1 N2 N0 N1 N2 Therefore, we need to care this overlapping when iterating pfn range. There are one place in page_owner.c that iterates pfn range and it doesn't consider this overlapping. Add it. Without this patch, above system could over count early allocated page number before page_owner is activated. Signed-off-by: Joonsoo Kim Acked-by: Vlastimil Babka Cc: Rik van Riel Cc: Johannes Weiner Cc: Mel Gorman Cc: Laura Abbott Cc: Minchan Kim Cc: Marek Szyprowski Cc: Michal Nazarewicz Cc: "Aneesh Kumar K.V" Cc: "Rafael J. Wysocki" Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_owner.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/page_owner.c b/mm/page_owner.c index ac3d8d129974..438768c092ac 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -301,6 +301,9 @@ static void init_pages_in_zone(pg_data_t *pgdat, struct zone *zone) page = pfn_to_page(pfn); + if (page_zone(page) != zone) + continue; + /* * We are safe to check buddy flag and order, because * this is init stage and only single thread runs. -- 2.34.1