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 */
14 struct 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
24 extern void debug_mutex_lock_common(struct mutex *lock,
25 struct mutex_waiter *waiter);
26 extern void debug_mutex_wake_waiter(struct mutex *lock,
27 struct mutex_waiter *waiter);
28 extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
29 extern void debug_mutex_add_waiter(struct mutex *lock,
30 struct mutex_waiter *waiter,
31 struct task_struct *task);
32 extern void debug_mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
33 struct task_struct *task);
34 extern void debug_mutex_unlock(struct mutex *lock);
35 extern 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
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