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 | |