1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/md/md.h b/drivers/md/md.h
index f184b69ef337..87430fea2875 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -289,6 +289,7 @@ struct mddev_s
                                                                 * hot-adding a bitmap.  It should
                                                                 * eventually be settable by sysfs.
                                                                 */
+        struct mutex                    bitmap_mutex;
 
         struct list_head                all_mddevs;
 };