diff --git a/include/linux/mm.h b/include/linux/mm.h
index a4c66846..c36297f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -868,6 +868,7 @@
 int redirty_page_for_writepage(struct writeback_control *wbc,
 				struct page *page);
 void account_page_dirtied(struct page *page, struct address_space *mapping);
+void account_page_writeback(struct page *page);
 int set_page_dirty(struct page *page);
 int set_page_dirty_lock(struct page *page);
 int clear_page_dirty_for_io(struct page *page);