diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3c5505a..3cccd05 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1411,8 +1411,7 @@
 
 extern unsigned long do_brk(unsigned long, unsigned long);
 
-/* filemap.c */
-extern unsigned long page_unuse(struct page *);
+/* truncate.c */
 extern void truncate_inode_pages(struct address_space *, loff_t);
 extern void truncate_inode_pages_range(struct address_space *,
 				       loff_t lstart, loff_t lend);