1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 9121595a8ebf..433da8a1a426 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -53,6 +53,9 @@ struct mutex {
 #if defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_SMP)
         struct task_struct      *owner;
 #endif
+#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
+        void                    *spin_mlock;    /* Spinner MCS lock */
+#endif
 #ifdef CONFIG_DEBUG_MUTEXES
         const char              *name;
         void                    *magic;