linux/kernel/mutex-debug.c at master · fabgithub/linux · GitHub

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* kernel/mutex-debug.c

* Debugging code for mutexes

* Started by Ingo Molnar:

* lock debugging, locking tree, deadlock detection started by:

* Released under the General Public License (GPL).

#include <linux/mutex.h>

#include <linux/delay.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-debug.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);

}

void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter)

{

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));

}

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 thread_info *ti)

{

SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock));

/* Mark the current thread as blocked on the lock: */

ti->task->blocked_on = waiter;

}

void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,

struct thread_info *ti)

{

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);

ti->task->blocked_on = NULL;

list_del_init(&waiter->list);

waiter->task = NULL;

}

void debug_mutex_unlock(struct mutex *lock)

{

if (unlikely(!debug_locks))

return;

DEBUG_LOCKS_WARN_ON(lock->magic != lock);

DEBUG_LOCKS_WARN_ON(lock->owner != current);

DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next);

mutex_clear_owner(lock);

}

void debug_mutex_init(struct mutex *lock, const char *name,

struct lock_class_key *key)

{

#ifdef CONFIG_DEBUG_LOCK_ALLOC

* Make sure we are not reinitializing a held lock:

debug_check_no_locks_freed((void *)lock, sizeof(*lock));

lockdep_init_map(&lock->dep_map, name, key, 0);

#endif

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.

void mutex_destroy(struct mutex *lock)

{

DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock));

lock->magic = NULL;

}

EXPORT_SYMBOL_GPL(mutex_destroy);

linux/kernel/mutex-debug.c at master · fabgithub/linux · GitHub

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