diff --git a/include/linux/mm.h b/include/linux/mm.h
index 082b68c..8cbc0aa 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -794,6 +794,8 @@
 extern int vmtruncate(struct inode * inode, loff_t offset);
 extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end);
 
+int truncate_inode_page(struct address_space *mapping, struct page *page);
+
 #ifdef CONFIG_MMU
 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 			unsigned long address, unsigned int flags);