diff --git a/fs/block_dev.c b/fs/block_dev.c
index f05bf16cd97..88928701959 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -928,6 +928,7 @@ EXPORT_SYMBOL_GPL(bd_unlink_disk_holder);
  * flush_disk - invalidates all buffer-cache entries on a disk
  *
  * @bdev:      struct block device to be flushed
+ * @kill_dirty: flag to guide handling of dirty inodes
  *
  * Invalidates all buffer-cache entries on a disk. It should be called
  * when a disk has been changed -- either by a media change or online