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kernel/mutex-debug.c
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/* * kernel/mutex-debug.c * * Debugging code for mutexes * * Started by Ingo Molnar: * * Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> * * lock debugging, locking tree, deadlock detection started by: * * Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey * Released under the General Public License (GPL). */ #include <linux/mutex.h> |
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#include <linux/delay.h> #include <linux/module.h> |
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#include <linux/poison.h> |
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#include <linux/spinlock.h> #include <linux/kallsyms.h> #include <linux/interrupt.h> |
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#include <linux/debug_locks.h> |
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#include "mutex-debug.h" /* |
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* Must be called with lock->wait_lock held. */ |
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void debug_mutex_set_owner(struct mutex *lock, struct thread_info *new_owner) |
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{ lock->owner = new_owner; |
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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; INIT_LIST_HEAD(&waiter->list); } void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter) { |
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SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock)); DEBUG_LOCKS_WARN_ON(list_empty(&lock->wait_list)); DEBUG_LOCKS_WARN_ON(waiter->magic != waiter); DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list)); |
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} void debug_mutex_free_waiter(struct mutex_waiter *waiter) { |
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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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} void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter, |
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struct thread_info *ti) |
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{ |
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SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock)); |
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/* Mark the current thread as blocked on the lock: */ ti->task->blocked_on = waiter; waiter->lock = lock; } void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter, struct thread_info *ti) { |
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DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list)); DEBUG_LOCKS_WARN_ON(waiter->task != ti->task); DEBUG_LOCKS_WARN_ON(ti->task->blocked_on != waiter); |
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ti->task->blocked_on = NULL; list_del_init(&waiter->list); waiter->task = NULL; } void debug_mutex_unlock(struct mutex *lock) { |
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if (unlikely(!debug_locks)) return; |
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DEBUG_LOCKS_WARN_ON(lock->owner != current_thread_info()); |
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DEBUG_LOCKS_WARN_ON(lock->magic != lock); DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next); DEBUG_LOCKS_WARN_ON(lock->owner != current_thread_info()); |
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} |
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void debug_mutex_init(struct mutex *lock, const char *name, struct lock_class_key *key) |
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{ |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC |
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/* * Make sure we are not reinitializing a held lock: */ |
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debug_check_no_locks_freed((void *)lock, sizeof(*lock)); |
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lockdep_init_map(&lock->dep_map, name, key, 0); |
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#endif |
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lock->owner = NULL; |
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lock->magic = lock; } /*** * mutex_destroy - mark a mutex unusable * @lock: the mutex to be destroyed * * This function marks the mutex uninitialized, and any subsequent * use of the mutex is forbidden. The mutex must not be locked when * this function is called. */ |
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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; } EXPORT_SYMBOL_GPL(mutex_destroy); |