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408894e [PATCH] mutex subsystem, debugging code
Ingo Molnar authored
1 /*
2 * kernel/mutex-debug.c
3 *
4 * Debugging code for mutexes
5 *
6 * Started by Ingo Molnar:
7 *
8 * Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
9 *
10 * lock debugging, locking tree, deadlock detection started by:
11 *
12 * Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey
13 * Released under the General Public License (GPL).
14 */
15 #include <linux/mutex.h>
16 #include <linux/delay.h>
9984de1 @paulgortmaker kernel: Map most files to use export.h instead of module.h
paulgortmaker authored
17 #include <linux/export.h>
a7807a3 [PATCH] poison: add & use more constants
Randy Dunlap authored
18 #include <linux/poison.h>
d43c36d headers: remove sched.h from interrupt.h
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19 #include <linux/sched.h>
408894e [PATCH] mutex subsystem, debugging code
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20 #include <linux/spinlock.h>
21 #include <linux/kallsyms.h>
22 #include <linux/interrupt.h>
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23 #include <linux/debug_locks.h>
408894e [PATCH] mutex subsystem, debugging code
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24
25 #include "mutex-debug.h"
26
27 /*
28 * Must be called with lock->wait_lock held.
29 */
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30 void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
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31 {
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32 memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter));
408894e [PATCH] mutex subsystem, debugging code
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33 waiter->magic = waiter;
34 INIT_LIST_HEAD(&waiter->list);
35 }
36
37 void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter)
38 {
9e7f4d4 [PATCH] lockdep: rename DEBUG_WARN_ON()
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39 SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock));
40 DEBUG_LOCKS_WARN_ON(list_empty(&lock->wait_list));
41 DEBUG_LOCKS_WARN_ON(waiter->magic != waiter);
42 DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list));
408894e [PATCH] mutex subsystem, debugging code
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43 }
44
45 void debug_mutex_free_waiter(struct mutex_waiter *waiter)
46 {
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47 DEBUG_LOCKS_WARN_ON(!list_empty(&waiter->list));
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48 memset(waiter, MUTEX_DEBUG_FREE, sizeof(*waiter));
408894e [PATCH] mutex subsystem, debugging code
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49 }
50
51 void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter,
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52 struct thread_info *ti)
408894e [PATCH] mutex subsystem, debugging code
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53 {
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54 SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock));
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55
408894e [PATCH] mutex subsystem, debugging code
Ingo Molnar authored
56 /* Mark the current thread as blocked on the lock: */
57 ti->task->blocked_on = waiter;
58 }
59
60 void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
61 struct thread_info *ti)
62 {
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63 DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list));
64 DEBUG_LOCKS_WARN_ON(waiter->task != ti->task);
65 DEBUG_LOCKS_WARN_ON(ti->task->blocked_on != waiter);
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66 ti->task->blocked_on = NULL;
67
68 list_del_init(&waiter->list);
69 waiter->task = NULL;
70 }
71
72 void debug_mutex_unlock(struct mutex *lock)
73 {
2ee91f1 [PATCH] lockdep: show more details about self-test failures
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74 if (unlikely(!debug_locks))
75 return;
76
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77 DEBUG_LOCKS_WARN_ON(lock->magic != lock);
c6eb3dd mutex: Use p->on_cpu for the adaptive spin
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78 DEBUG_LOCKS_WARN_ON(lock->owner != current);
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79 DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next);
0d66bf6 mutex: implement adaptive spinning
Peter Zijlstra authored
80 mutex_clear_owner(lock);
408894e [PATCH] mutex subsystem, debugging code
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81 }
82
ef5d470 [PATCH] lockdep: prove mutex locking correctness
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83 void debug_mutex_init(struct mutex *lock, const char *name,
84 struct lock_class_key *key)
408894e [PATCH] mutex subsystem, debugging code
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85 {
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86 #ifdef CONFIG_DEBUG_LOCK_ALLOC
408894e [PATCH] mutex subsystem, debugging code
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87 /*
88 * Make sure we are not reinitializing a held lock:
89 */
9a11b49 [PATCH] lockdep: better lock debugging
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90 debug_check_no_locks_freed((void *)lock, sizeof(*lock));
4dfbb9d Lockdep: add lockdep_set_class_and_subclass() and lockdep_set_subclass()
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91 lockdep_init_map(&lock->dep_map, name, key, 0);
ef5d470 [PATCH] lockdep: prove mutex locking correctness
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92 #endif
408894e [PATCH] mutex subsystem, debugging code
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93 lock->magic = lock;
94 }
95
96 /***
97 * mutex_destroy - mark a mutex unusable
98 * @lock: the mutex to be destroyed
99 *
100 * This function marks the mutex uninitialized, and any subsequent
101 * use of the mutex is forbidden. The mutex must not be locked when
102 * this function is called.
103 */
7ad5b3a @hharrison kernel: remove fastcall in kernel/*
hharrison authored
104 void mutex_destroy(struct mutex *lock)
408894e [PATCH] mutex subsystem, debugging code
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105 {
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106 DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock));
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107 lock->magic = NULL;
108 }
109
110 EXPORT_SYMBOL_GPL(mutex_destroy);
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