diff --git a/drivers/md/md.h b/drivers/md/md.h
index fe275ec346471356b18a57498e6c50102f58629e..ea67637f70825dc04dd9744720f24e1d06ebcc03 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -510,10 +510,12 @@ struct mddev {
 
 	bool	has_superblocks:1;
 
+#ifndef __GENKSYMS__
 	/* Used to synchronize idle and frozen for action_store() */
 	struct mutex sync_mutex;
 	/* The sequence number for sync thread */
 	atomic_t sync_seq;
+#endif
 };
 
 enum recovery_flags {