--- zzzz-none-000/linux-4.9.279/include/linux/mutex-debug.h	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/include/linux/mutex-debug.h	2023-02-08 11:43:43.000000000 +0000
@@ -10,7 +10,12 @@
  */
 
 #define __DEBUG_MUTEX_INITIALIZER(lockname)				\
-	, .magic = &lockname
+	, .magic = &lockname						\
+	, .owner_info = {						\
+		.pid = NULL,						\
+		.ip = 0,						\
+	}								\
+	, .owner_lock = __SPIN_LOCK_UNLOCKED(lockname.owner_lock)
 
 #define mutex_init(mutex)						\
 do {									\
@@ -21,4 +26,7 @@
 
 extern void mutex_destroy(struct mutex *lock);
 
+extern int debug_mutex_task_blocked_by(struct task_struct *blocking_task,
+				       struct callerinfo *owner_info);
+extern void show_blocking_mutex_holder(struct task_struct *task);
 #endif