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Linux/kernel/locking/mutex-debug.c

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  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>
 17 #include <linux/export.h>
 18 #include <linux/poison.h>
 19 #include <linux/sched.h>
 20 #include <linux/spinlock.h>
 21 #include <linux/kallsyms.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/debug_locks.h>
 24 
 25 #include "mutex-debug.h"
 26 
 27 /*
 28  * Must be called with lock->wait_lock held.
 29  */
 30 void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
 31 {
 32         memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter));
 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 {
 39         lockdep_assert_held(&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));
 43 }
 44 
 45 void debug_mutex_free_waiter(struct mutex_waiter *waiter)
 46 {
 47         DEBUG_LOCKS_WARN_ON(!list_empty(&waiter->list));
 48         memset(waiter, MUTEX_DEBUG_FREE, sizeof(*waiter));
 49 }
 50 
 51 void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter,
 52                             struct task_struct *task)
 53 {
 54         lockdep_assert_held(&lock->wait_lock);
 55 
 56         /* Mark the current thread as blocked on the lock: */
 57         task->blocked_on = waiter;
 58 }
 59 
 60 void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
 61                          struct task_struct *task)
 62 {
 63         DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list));
 64         DEBUG_LOCKS_WARN_ON(waiter->task != task);
 65         DEBUG_LOCKS_WARN_ON(task->blocked_on != waiter);
 66         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 {
 74         if (likely(debug_locks)) {
 75                 DEBUG_LOCKS_WARN_ON(lock->magic != lock);
 76                 DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next);
 77         }
 78 }
 79 
 80 void debug_mutex_init(struct mutex *lock, const char *name,
 81                       struct lock_class_key *key)
 82 {
 83 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 84         /*
 85          * Make sure we are not reinitializing a held lock:
 86          */
 87         debug_check_no_locks_freed((void *)lock, sizeof(*lock));
 88         lockdep_init_map(&lock->dep_map, name, key, 0);
 89 #endif
 90         lock->magic = lock;
 91 }
 92 
 93 /***
 94  * mutex_destroy - mark a mutex unusable
 95  * @lock: the mutex to be destroyed
 96  *
 97  * This function marks the mutex uninitialized, and any subsequent
 98  * use of the mutex is forbidden. The mutex must not be locked when
 99  * this function is called.
100  */
101 void mutex_destroy(struct mutex *lock)
102 {
103         DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock));
104         lock->magic = NULL;
105 }
106 
107 EXPORT_SYMBOL_GPL(mutex_destroy);
108 

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