diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index d5fbd860c8cd2..49dccd9050f12 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -765,7 +765,7 @@ static loff_t iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i)
 		 * same page as we're writing to, without it being marked
 		 * up-to-date.
 		 */
-		if (unlikely(fault_in_iov_iter_readable(i, bytes))) {
+		if (unlikely(fault_in_iov_iter_readable(i, bytes) == bytes)) {
 			status = -EFAULT;
 			break;
 		}
diff --git a/mm/filemap.c b/mm/filemap.c
index 8426434042f4d..647d72bf23b63 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3779,7 +3779,7 @@ ssize_t generic_perform_write(struct file *file,
 		 * same page as we're writing to, without it being marked
 		 * up-to-date.
 		 */
-		if (unlikely(fault_in_iov_iter_readable(i, bytes))) {
+		if (unlikely(fault_in_iov_iter_readable(i, bytes) == bytes)) {
 			status = -EFAULT;
 			break;
 		}