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-rw-r--r--mm/page_alloc.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 253a450c400..fd631c2536a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -286,22 +286,27 @@ __find_combined_index(unsigned long page_idx, unsigned int order)
* we can do coalesce a page and its buddy if
* (a) the buddy is not in a hole &&
* (b) the buddy is in the buddy system &&
- * (c) a page and its buddy have the same order.
+ * (c) a page and its buddy have the same order &&
+ * (d) a page and its buddy are in the same zone.
*
* For recording whether a page is in the buddy system, we use PG_buddy.
* Setting, clearing, and testing PG_buddy is serialized by zone->lock.
*
* For recording page's order, we use page_private(page).
*/
-static inline int page_is_buddy(struct page *page, int order)
+static inline int page_is_buddy(struct page *page, struct page *buddy,
+ int order)
{
#ifdef CONFIG_HOLES_IN_ZONE
- if (!pfn_valid(page_to_pfn(page)))
+ if (!pfn_valid(page_to_pfn(buddy)))
return 0;
#endif
- if (PageBuddy(page) && page_order(page) == order) {
- BUG_ON(page_count(page) != 0);
+ if (page_zone_id(page) != page_zone_id(buddy))
+ return 0;
+
+ if (PageBuddy(buddy) && page_order(buddy) == order) {
+ BUG_ON(page_count(buddy) != 0);
return 1;
}
return 0;
@@ -352,7 +357,7 @@ static inline void __free_one_page(struct page *page,
struct page *buddy;
buddy = __page_find_buddy(page, page_idx, order);
- if (!page_is_buddy(buddy, order))
+ if (!page_is_buddy(page, buddy, order))
break; /* Move the buddy up one level. */
list_del(&buddy->lru);