1 files changed, 6 insertions, 0 deletions

diff --git a/include/litmus/locking.h b/include/litmus/locking.h
index 4d7b870cb443..27eafd002556 100644
--- a/include/litmus/locking.h
+++ b/include/litmus/locking.h
@@ -1,6 +1,8 @@
 #ifndef LITMUS_LOCKING_H
 #define LITMUS_LOCKING_H
 
+#include <linux/list.h>
+
 struct litmus_lock_ops;
 
 /* Generic base struct for LITMUS^RT userspace semaphores.
@@ -9,6 +11,10 @@ struct litmus_lock_ops;
 struct litmus_lock {
         struct litmus_lock_ops *ops;
         int type;
+    
+#ifdef CONFIG_LITMUS_NESTED_LOCKING
+    struct list_head lock_chain;
+#endif
 };
 
 struct litmus_lock_ops {