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 */
46

source code of linux/kernel/locking/mutex.h