1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Mutexes: blocking mutual exclusion locks
 4 *
 5 * started by Ingo Molnar:
 6 *
 7 *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 
 
 
 8 */
 9
10/*
11 * This is the control structure for tasks blocked on mutex, which resides
12 * on the blocked task's kernel stack:
13 */
14struct mutex_waiter {
15	struct list_head	list;
16	struct task_struct	*task;
17	struct ww_acquire_ctx	*ww_ctx;
18#ifdef CONFIG_DEBUG_MUTEXES
19	void			*magic;
20#endif
21};
22
23#ifdef CONFIG_DEBUG_MUTEXES
24extern void debug_mutex_lock_common(struct mutex *lock,
25				    struct mutex_waiter *waiter);
26extern void debug_mutex_wake_waiter(struct mutex *lock,
27				    struct mutex_waiter *waiter);
28extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
29extern void debug_mutex_add_waiter(struct mutex *lock,
30				   struct mutex_waiter *waiter,
31				   struct task_struct *task);
32extern void debug_mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
33				      struct task_struct *task);
34extern void debug_mutex_unlock(struct mutex *lock);
35extern void debug_mutex_init(struct mutex *lock, const char *name,
36			     struct lock_class_key *key);
37#else /* CONFIG_DEBUG_MUTEXES */
38# define debug_mutex_lock_common(lock, waiter)		do { } while (0)
39# define debug_mutex_wake_waiter(lock, waiter)		do { } while (0)
40# define debug_mutex_free_waiter(waiter)		do { } while (0)
41# define debug_mutex_add_waiter(lock, waiter, ti)	do { } while (0)
42# define debug_mutex_remove_waiter(lock, waiter, ti)	do { } while (0)
43# define debug_mutex_unlock(lock)			do { } while (0)
44# define debug_mutex_init(lock, name, key)		do { } while (0)
45#endif /* !CONFIG_DEBUG_MUTEXES */

 
 1/*
 2 * Mutexes: blocking mutual exclusion locks
 3 *
 4 * started by Ingo Molnar:
 5 *
 6 *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 7 *
 8 * This file contains mutex debugging related internal prototypes, for the
 9 * !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs:
10 */
11
12#define spin_lock_mutex(lock, flags) \
13		do { spin_lock(lock); (void)(flags); } while (0)
14#define spin_unlock_mutex(lock, flags) \
15		do { spin_unlock(lock); (void)(flags); } while (0)
16#define mutex_remove_waiter(lock, waiter, task) \
17		__list_del((waiter)->list.prev, (waiter)->list.next)
18
19#define debug_mutex_wake_waiter(lock, waiter)		do { } while (0)
20#define debug_mutex_free_waiter(waiter)			do { } while (0)
21#define debug_mutex_add_waiter(lock, waiter, ti)	do { } while (0)
22#define debug_mutex_unlock(lock)			do { } while (0)
23#define debug_mutex_init(lock, name, key)		do { } while (0)
24
25static inline void
26debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
27{
28}