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106 lines
2.8 KiB
106 lines
2.8 KiB
/* |
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* Debugging code for mutexes |
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* |
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* Started by Ingo Molnar: |
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* |
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* Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <[email protected]> |
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* |
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* lock debugging, locking tree, deadlock detection started by: |
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* |
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* Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey |
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* Released under the General Public License (GPL). |
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*/ |
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#include <linux/mutex.h> |
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#include <linux/delay.h> |
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#include <linux/export.h> |
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#include <linux/poison.h> |
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#include <linux/sched.h> |
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#include <linux/spinlock.h> |
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#include <linux/kallsyms.h> |
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#include <linux/interrupt.h> |
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#include <linux/debug_locks.h> |
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#include "mutex.h" |
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/* |
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* Must be called with lock->wait_lock held. |
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*/ |
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void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter) |
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{ |
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memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter)); |
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waiter->magic = waiter; |
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INIT_LIST_HEAD(&waiter->list); |
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waiter->ww_ctx = MUTEX_POISON_WW_CTX; |
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} |
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void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter) |
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{ |
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lockdep_assert_held(&lock->wait_lock); |
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DEBUG_LOCKS_WARN_ON(list_empty(&lock->wait_list)); |
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DEBUG_LOCKS_WARN_ON(waiter->magic != waiter); |
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DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list)); |
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} |
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void debug_mutex_free_waiter(struct mutex_waiter *waiter) |
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{ |
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DEBUG_LOCKS_WARN_ON(!list_empty(&waiter->list)); |
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memset(waiter, MUTEX_DEBUG_FREE, sizeof(*waiter)); |
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} |
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void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter, |
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struct task_struct *task) |
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{ |
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lockdep_assert_held(&lock->wait_lock); |
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/* Mark the current thread as blocked on the lock: */ |
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task->blocked_on = waiter; |
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} |
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void debug_mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter, |
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struct task_struct *task) |
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{ |
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DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list)); |
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DEBUG_LOCKS_WARN_ON(waiter->task != task); |
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DEBUG_LOCKS_WARN_ON(task->blocked_on != waiter); |
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task->blocked_on = NULL; |
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INIT_LIST_HEAD(&waiter->list); |
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waiter->task = NULL; |
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} |
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void debug_mutex_unlock(struct mutex *lock) |
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{ |
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if (likely(debug_locks)) { |
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DEBUG_LOCKS_WARN_ON(lock->magic != lock); |
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DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next); |
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} |
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} |
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void debug_mutex_init(struct mutex *lock, const char *name, |
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struct lock_class_key *key) |
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{ |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC |
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/* |
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* Make sure we are not reinitializing a held lock: |
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*/ |
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debug_check_no_locks_freed((void *)lock, sizeof(*lock)); |
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lockdep_init_map_wait(&lock->dep_map, name, key, 0, LD_WAIT_SLEEP); |
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#endif |
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lock->magic = lock; |
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} |
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/*** |
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* mutex_destroy - mark a mutex unusable |
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* @lock: the mutex to be destroyed |
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* |
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* This function marks the mutex uninitialized, and any subsequent |
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* use of the mutex is forbidden. The mutex must not be locked when |
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* this function is called. |
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*/ |
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void mutex_destroy(struct mutex *lock) |
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{ |
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DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock)); |
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lock->magic = NULL; |
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} |
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EXPORT_SYMBOL_GPL(mutex_destroy);
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