diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 36a168e..426056a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -614,6 +614,10 @@
 			list = &pcp->lists[migratetype];
 		} while (list_empty(list));
 
+		/* This is the only non-empty list. Free them all. */
+		if (batch_free == MIGRATE_PCPTYPES)
+			batch_free = to_free;
+
 		do {
 			page = list_entry(list->prev, struct page, lru);
 			/* must delete as __free_one_page list manipulates */