X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=mm%2Fpage_alloc.c;h=21c272d517bc45a787de56bc7218d7581a3603d2;hb=687875fb7de4a95223af20ee024282fa9099f860;hp=0027d8f4a1bb8b1423f42e4d52cb3547debc315f;hpb=b3c9dd182ed3bdcdaf0e42625a35924b0497afdc;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0027d8f..21c272d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5414,6 +5414,17 @@ __count_immobile_pages(struct zone *zone, struct page *page, int count)
 bool is_pageblock_removable_nolock(struct page *page)
 {
 	struct zone *zone = page_zone(page);
+	unsigned long pfn = page_to_pfn(page);
+
+	/*
+	 * We have to be careful here because we are iterating over memory
+	 * sections which are not zone aware so we might end up outside of
+	 * the zone but still within the section.
+	 */
+	if (!zone || zone->zone_start_pfn > pfn ||
+			zone->zone_start_pfn + zone->spanned_pages <= pfn)
+		return false;
+
 	return __count_immobile_pages(zone, page, 0);
 }