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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109/* * 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>#include <linux/delay.h>#include <linux/device.h>#include <linux/export.h>#include <linux/poison.h>#include <linux/sched.h>#include <linux/spinlock.h>#include <linux/kallsyms.h>#include <linux/interrupt.h>#include <linux/debug_locks.h>
#include "mutex.h"
/* * Must be called with lock->wait_lock held. */void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter){ memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter)); waiter->magic = waiter; INIT_LIST_HEAD(&waiter->list); waiter->ww_ctx = MUTEX_POISON_WW_CTX;}
void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter){ lockdep_assert_held(&lock->wait_lock); DEBUG_LOCKS_WARN_ON(!lock->first_waiter); DEBUG_LOCKS_WARN_ON(waiter->magic != waiter);}
void debug_mutex_free_waiter(struct mutex_waiter *waiter){ DEBUG_LOCKS_WARN_ON(!list_empty(&waiter->list)); memset(waiter, MUTEX_DEBUG_FREE, sizeof(*waiter));}
void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter, struct task_struct *task){ lockdep_assert_held(&lock->wait_lock);
/* Current thread can't be already blocked (since it's executing!) */ DEBUG_LOCKS_WARN_ON(get_task_blocked_on(task));}
void debug_mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter, struct task_struct *task){ struct mutex *blocked_on = get_task_blocked_on(task);
DEBUG_LOCKS_WARN_ON(waiter->task != task); DEBUG_LOCKS_WARN_ON(blocked_on && blocked_on != lock);
INIT_LIST_HEAD(&waiter->list); waiter->task = NULL;}
void debug_mutex_unlock(struct mutex *lock){ if (likely(debug_locks)) { DEBUG_LOCKS_WARN_ON(lock->magic != lock); }}
void debug_mutex_init(struct mutex *lock){ lock->magic = lock;}
static void devm_mutex_release(void *res){ mutex_destroy(res);}
int __devm_mutex_init(struct device *dev, struct mutex *lock){ return devm_add_action_or_reset(dev, devm_mutex_release, lock);}EXPORT_SYMBOL_GPL(__devm_mutex_init);
/*** * 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. */void mutex_destroy(struct mutex *lock){ DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock)); lock->magic = NULL;}
EXPORT_SYMBOL_GPL(mutex_destroy);