1 files changed, 7 insertions, 0 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index af982f7cdb2a..feb791648a1f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -694,6 +694,9 @@ static int move_freepages(struct zone *zone,
 #endif
 
         for (page = start_page; page <= end_page;) {
+                /* Make sure we are not inadvertently changing nodes */
+                VM_BUG_ON(page_to_nid(page) != zone_to_nid(zone));
+
                 if (!pfn_valid_within(page_to_pfn(page))) {
                         page++;
                         continue;
@@ -2516,6 +2519,10 @@ static void setup_zone_migrate_reserve(struct zone *zone)
                         continue;
                 page = pfn_to_page(pfn);
 
+                /* Watch out for overlapping nodes */
+                if (page_to_nid(page) != zone_to_nid(zone))
+                        continue;
+
                 /* Blocks with reserved pages will never free, skip them. */
                 if (PageReserved(page))
                         continue;