diff --git a/mm/truncate.c b/mm/truncate.c
index 2f03c3ac7ab7..2d6151fc8f08 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -603,7 +603,6 @@ void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to)
 	struct page *page;
 	pgoff_t index;
 
-	WARN_ON(!mutex_is_locked(&inode->i_mutex));
 	WARN_ON(to > inode->i_size);
 
 	if (from >= to || bsize == PAGE_CACHE_SIZE)