locking/mutex: Consolidate core headers, remove kernel/locking/mutex-debug.h

Having two header files which contain just the non-debug and debug variants
is mostly waste of disc space and has no real value. Stick the debug
variants into the common mutex.h file as counterpart to the stubs for the
non-debug case.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211303.995350521@linutronix.de

kernel/locking/mutex-debug.c

 /*
- * kernel/mutex-debug.c
- *
  * Debugging code for mutexes
  *
  * Started by Ingo Molnar:
@@ -22,7 +20,7 @@
 #include <linux/interrupt.h>
 #include <linux/debug_locks.h>
 
-#include "mutex-debug.h"
+#include "mutex.h"
 
 /*
  * Must be called with lock->wait_lock held.

kernel/locking/mutex-debug.h

-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Mutexes: blocking mutual exclusion locks
- *
- * started by Ingo Molnar:
- *
- *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
- *
- * This file contains mutex debugging related internal declarations,
- * prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
- * More details are in kernel/mutex-debug.c.
- */
-
-/*
- * This must be called with lock->wait_lock held.
- */
-extern void debug_mutex_lock_common(struct mutex *lock,
-				    struct mutex_waiter *waiter);
-extern void debug_mutex_wake_waiter(struct mutex *lock,
-				    struct mutex_waiter *waiter);
-extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
-extern void debug_mutex_add_waiter(struct mutex *lock,
-				   struct mutex_waiter *waiter,
-				   struct task_struct *task);
-extern void debug_mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
-				struct task_struct *task);
-extern void debug_mutex_unlock(struct mutex *lock);
-extern void debug_mutex_init(struct mutex *lock, const char *name,
-			     struct lock_class_key *key);

kernel/locking/mutex.c

@@ -30,11 +30,11 @@
 #include <linux/debug_locks.h>
 #include <linux/osq_lock.h>
 
+#include "mutex.h"
+
 #ifdef CONFIG_DEBUG_MUTEXES
-# include "mutex-debug.h"
 # define MUTEX_WARN_ON(cond) DEBUG_LOCKS_WARN_ON(cond)
 #else
-# include "mutex.h"
 # define MUTEX_WARN_ON(cond)
 #endif
 

kernel/locking/mutex.h

@@ -5,19 +5,28 @@
  * started by Ingo Molnar:
  *
  *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
- *
- * This file contains mutex debugging related internal prototypes, for the
- * !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs:
  */
 
-#define debug_mutex_wake_waiter(lock, waiter)		do { } while (0)
-#define debug_mutex_free_waiter(waiter)			do { } while (0)
-#define debug_mutex_add_waiter(lock, waiter, ti)	do { } while (0)
-#define debug_mutex_remove_waiter(lock, waiter, ti)     do { } while (0)
-#define debug_mutex_unlock(lock)			do { } while (0)
-#define debug_mutex_init(lock, name, key)		do { } while (0)
-
-static inline void
-debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
-{
-}
+#ifdef CONFIG_DEBUG_MUTEXES
+extern void debug_mutex_lock_common(struct mutex *lock,
+				    struct mutex_waiter *waiter);
+extern void debug_mutex_wake_waiter(struct mutex *lock,
+				    struct mutex_waiter *waiter);
+extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
+extern void debug_mutex_add_waiter(struct mutex *lock,
+				   struct mutex_waiter *waiter,
+				   struct task_struct *task);
+extern void debug_mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
+				      struct task_struct *task);
+extern void debug_mutex_unlock(struct mutex *lock);
+extern void debug_mutex_init(struct mutex *lock, const char *name,
+			     struct lock_class_key *key);
+#else /* CONFIG_DEBUG_MUTEXES */
+# define debug_mutex_lock_common(lock, waiter)		do { } while (0)
+# define debug_mutex_wake_waiter(lock, waiter)		do { } while (0)
+# define debug_mutex_free_waiter(waiter)		do { } while (0)
+# define debug_mutex_add_waiter(lock, waiter, ti)	do { } while (0)
+# define debug_mutex_remove_waiter(lock, waiter, ti)	do { } while (0)
+# define debug_mutex_unlock(lock)			do { } while (0)
+# define debug_mutex_init(lock, name, key)		do { } while (0)
+#endif /* !CONFIG_DEBUG_MUTEXES */