diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ce3315e22f35..9d49803d46af 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3600,16 +3600,11 @@ EXPORT_SYMBOL_GPL(split_page);
 
 int __isolate_free_page(struct page *page, unsigned int order)
 {
-	unsigned long watermark;
-	struct zone *zone;
-	int mt;
-
-	BUG_ON(!PageBuddy(page));
-
-	zone = page_zone(page);
-	mt = get_pageblock_migratetype(page);
+	struct zone *zone = page_zone(page);
+	int mt = get_pageblock_migratetype(page);
 
 	if (!is_migrate_isolate(mt)) {
+		unsigned long watermark;
 		/*
 		 * Obey watermarks as if the page was being allocated. We can
 		 * emulate a high-order watermark check with a raised order-0
@@ -3623,8 +3618,6 @@ int __isolate_free_page(struct page *page, unsigned int order)
 		__mod_zone_freepage_state(zone, -(1UL << order), mt);
 	}
 
-	/* Remove page from free list */
-
 	del_page_from_free_list(page, zone, order);
 
 	/*
@@ -3645,7 +3638,6 @@ int __isolate_free_page(struct page *page, unsigned int order)
 		}
 	}
 
-
 	return 1UL << order;
 }