*
* It is not allowed to initialize an already locked mutex.
*/
-__always_inline void fastcall __mutex_init(struct mutex *lock, const char *name)
+void
+__mutex_init(struct mutex *lock, const char *name, struct lock_class_key *key)
{
atomic_set(&lock->count, 1);
spin_lock_init(&lock->wait_lock);
INIT_LIST_HEAD(&lock->wait_list);
- debug_mutex_init(lock, name);
+ debug_mutex_init(lock, name, key);
}
EXPORT_SYMBOL(__mutex_init);
+#ifndef CONFIG_DEBUG_LOCK_ALLOC
/*
* We split the mutex lock/unlock logic into separate fastpath and
* slowpath functions, to reduce the register pressure on the fastpath.
}
EXPORT_SYMBOL(mutex_lock);
+#endif
static void fastcall noinline __sched
__mutex_unlock_slowpath(atomic_t *lock_count);
* Lock a mutex (possibly interruptible), slowpath:
*/
static inline int __sched
-__mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
+__mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
+ unsigned long ip)
{
struct task_struct *task = current;
struct mutex_waiter waiter;
spin_lock_mutex(&lock->wait_lock, flags);
debug_mutex_lock_common(lock, &waiter);
- debug_mutex_add_waiter(lock, &waiter, task->thread_info);
+ mutex_acquire(&lock->dep_map, subclass, 0, ip);
+ debug_mutex_add_waiter(lock, &waiter, task_thread_info(task));
/* add waiting tasks to the end of the waitqueue (FIFO): */
list_add_tail(&waiter.list, &lock->wait_list);
waiter.task = task;
+ old_val = atomic_xchg(&lock->count, -1);
+ if (old_val == 1)
+ goto done;
+
+ lock_contended(&lock->dep_map, ip);
+
for (;;) {
/*
* Lets try to take the lock again - this is needed even if
*/
if (unlikely(state == TASK_INTERRUPTIBLE &&
signal_pending(task))) {
- mutex_remove_waiter(lock, &waiter, task->thread_info);
+ mutex_remove_waiter(lock, &waiter, task_thread_info(task));
+ mutex_release(&lock->dep_map, 1, ip);
spin_unlock_mutex(&lock->wait_lock, flags);
debug_mutex_free_waiter(&waiter);
spin_lock_mutex(&lock->wait_lock, flags);
}
+done:
+ lock_acquired(&lock->dep_map);
/* got the lock - rejoice! */
- mutex_remove_waiter(lock, &waiter, task->thread_info);
- debug_mutex_set_owner(lock, task->thread_info);
+ mutex_remove_waiter(lock, &waiter, task_thread_info(task));
+ debug_mutex_set_owner(lock, task_thread_info(task));
/* set it to 0 if there are no waiters left: */
if (likely(list_empty(&lock->wait_list)))
return 0;
}
-static void fastcall noinline __sched
-__mutex_lock_slowpath(atomic_t *lock_count)
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+void __sched
+mutex_lock_nested(struct mutex *lock, unsigned int subclass)
{
- struct mutex *lock = container_of(lock_count, struct mutex, count);
+ might_sleep();
+ __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, subclass, _RET_IP_);
+}
+
+EXPORT_SYMBOL_GPL(mutex_lock_nested);
- __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, 0);
+int __sched
+mutex_lock_interruptible_nested(struct mutex *lock, unsigned int subclass)
+{
+ might_sleep();
+ return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, subclass, _RET_IP_);
}
+EXPORT_SYMBOL_GPL(mutex_lock_interruptible_nested);
+#endif
+
/*
* Release the lock, slowpath:
*/
static fastcall inline void
-__mutex_unlock_common_slowpath(atomic_t *lock_count)
+__mutex_unlock_common_slowpath(atomic_t *lock_count, int nested)
{
struct mutex *lock = container_of(lock_count, struct mutex, count);
unsigned long flags;
spin_lock_mutex(&lock->wait_lock, flags);
+ mutex_release(&lock->dep_map, nested, _RET_IP_);
debug_mutex_unlock(lock);
/*
static fastcall noinline void
__mutex_unlock_slowpath(atomic_t *lock_count)
{
- __mutex_unlock_common_slowpath(lock_count);
+ __mutex_unlock_common_slowpath(lock_count, 1);
}
+#ifndef CONFIG_DEBUG_LOCK_ALLOC
/*
* Here come the less common (and hence less performance-critical) APIs:
* mutex_lock_interruptible() and mutex_trylock().
EXPORT_SYMBOL(mutex_lock_interruptible);
+static void fastcall noinline __sched
+__mutex_lock_slowpath(atomic_t *lock_count)
+{
+ struct mutex *lock = container_of(lock_count, struct mutex, count);
+
+ __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, 0, _RET_IP_);
+}
+
static int fastcall noinline __sched
__mutex_lock_interruptible_slowpath(atomic_t *lock_count)
{
struct mutex *lock = container_of(lock_count, struct mutex, count);
- return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, 0);
+ return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, 0, _RET_IP_);
}
+#endif
/*
* Spinlock based trylock, we take the spinlock and check whether we
spin_lock_mutex(&lock->wait_lock, flags);
prev = atomic_xchg(&lock->count, -1);
- if (likely(prev == 1))
+ if (likely(prev == 1)) {
debug_mutex_set_owner(lock, current_thread_info());
-
+ mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_);
+ }
/* Set it back to 0 if there are no waiters: */
if (likely(list_empty(&lock->wait_list)))
atomic_set(&lock->count, 0);
* This function must not be used in interrupt context. The
* mutex must be released by the same task that acquired it.
*/
-int fastcall mutex_trylock(struct mutex *lock)
+int fastcall __sched mutex_trylock(struct mutex *lock)
{
return __mutex_fastpath_trylock(&lock->count,
__mutex_trylock_slowpath);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff