diff --git a/mm/internal.h b/mm/internal.h
index 8c6fd44..f7b35a0 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -90,6 +90,8 @@
  */
 extern int isolate_lru_page(struct page *page);
 extern void putback_lru_page(struct page *page);
+extern unsigned long zone_reclaimable_pages(struct zone *zone);
+extern bool zone_reclaimable(struct zone *zone);
 
 /*
  * in mm/page_alloc.c