locking/rtmutex: Remove empty and unused debug stubs

No users or useless and therefore just ballast.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210326153943.549192485@linutronix.de

include/linux/rtmutex.h

@@ -40,18 +40,9 @@ struct rt_mutex_waiter;
 struct hrtimer_sleeper;
 
 #ifdef CONFIG_DEBUG_RT_MUTEXES
- extern int rt_mutex_debug_check_no_locks_freed(const void *from,
-						unsigned long len);
- extern void rt_mutex_debug_check_no_locks_held(struct task_struct *task);
- extern void rt_mutex_debug_task_free(struct task_struct *tsk);
+extern void rt_mutex_debug_task_free(struct task_struct *tsk);
 #else
- static inline int rt_mutex_debug_check_no_locks_freed(const void *from,
-						       unsigned long len)
- {
-	return 0;
- }
-# define rt_mutex_debug_check_no_locks_held(task)	do { } while (0)
-# define rt_mutex_debug_task_free(t)			do { } while (0)
+static inline void rt_mutex_debug_task_free(struct task_struct *tsk) { }
 #endif
 
 #define rt_mutex_init(mutex) \
@@ -88,7 +79,6 @@ static inline int rt_mutex_is_locked(struct rt_mutex *lock)
 }
 
 extern void __rt_mutex_init(struct rt_mutex *lock, const char *name, struct lock_class_key *key);
-extern void rt_mutex_destroy(struct rt_mutex *lock);
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 extern void rt_mutex_lock_nested(struct rt_mutex *lock, unsigned int subclass);

kernel/locking/rtmutex-debug.c

@@ -38,20 +38,11 @@ void rt_mutex_debug_task_free(struct task_struct *task)
 	DEBUG_LOCKS_WARN_ON(task->pi_blocked_on);
 }
 
-void debug_rt_mutex_lock(struct rt_mutex *lock)
-{
-}
-
 void debug_rt_mutex_unlock(struct rt_mutex *lock)
 {
 	DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current);
 }
 
-void
-debug_rt_mutex_proxy_lock(struct rt_mutex *lock, struct task_struct *powner)
-{
-}
-
 void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock)
 {
 	DEBUG_LOCKS_WARN_ON(!rt_mutex_owner(lock));

kernel/locking/rtmutex-debug.h

@@ -13,10 +13,7 @@
 extern void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter);
 extern void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter);
 extern void debug_rt_mutex_init(struct rt_mutex *lock, const char *name, struct lock_class_key *key);
-extern void debug_rt_mutex_lock(struct rt_mutex *lock);
 extern void debug_rt_mutex_unlock(struct rt_mutex *lock);
-extern void debug_rt_mutex_proxy_lock(struct rt_mutex *lock,
-				      struct task_struct *powner);
 extern void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock);
 
 static inline bool debug_rt_mutex_detect_deadlock(struct rt_mutex_waiter *waiter,

kernel/locking/rtmutex.c

@@ -885,9 +885,6 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
 	raw_spin_unlock(&task->pi_lock);
 
 takeit:
-	/* We got the lock. */
-	debug_rt_mutex_lock(lock);
-
 	/*
 	 * This either preserves the RT_MUTEX_HAS_WAITERS bit if there
 	 * are still waiters or clears it.
@@ -1580,20 +1577,6 @@ void __sched rt_mutex_futex_unlock(struct rt_mutex *lock)
 		rt_mutex_postunlock(&wake_q);
 }
 
-/**
- * rt_mutex_destroy - mark a mutex unusable
- * @lock: the mutex to be destroyed
- *
- * This function marks the mutex uninitialized, and any subsequent
- * use of the mutex is forbidden. The mutex must not be locked when
- * this function is called.
- */
-void rt_mutex_destroy(struct rt_mutex *lock)
-{
-	WARN_ON(rt_mutex_is_locked(lock));
-}
-EXPORT_SYMBOL_GPL(rt_mutex_destroy);
-
 /**
  * __rt_mutex_init - initialize the rt_mutex
  *
@@ -1635,7 +1618,6 @@ void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
 				struct task_struct *proxy_owner)
 {
 	__rt_mutex_init(lock, NULL, NULL);
-	debug_rt_mutex_proxy_lock(lock, proxy_owner);
 	rt_mutex_set_owner(lock, proxy_owner);
 }
 

kernel/locking/rtmutex.h

@@ -13,8 +13,6 @@
 
 #define debug_rt_mutex_init_waiter(w)			do { } while (0)
 #define debug_rt_mutex_free_waiter(w)			do { } while (0)
-#define debug_rt_mutex_lock(l)				do { } while (0)
-#define debug_rt_mutex_proxy_lock(l,p)			do { } while (0)
 #define debug_rt_mutex_proxy_unlock(l)			do { } while (0)
 #define debug_rt_mutex_unlock(l)			do { } while (0)
 #define debug_rt_mutex_init(m, n, k)			do { } while (0)