/***
* mutex_init - initialize the mutex
* @lock: the mutex to be initialized
+ * @key: the lock_class_key for the class; used by mutex lock debugging
*
* Initialize the mutex to unlocked state.
*
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.
* We also put the fastpath first in the kernel image, to make sure the
* branch is predicted by the CPU as default-untaken.
*/
-static void fastcall noinline __sched
+static __used noinline void __sched
__mutex_lock_slowpath(atomic_t *lock_count);
/***
*
* This function is similar to (but not equivalent to) down().
*/
-void inline fastcall __sched mutex_lock(struct mutex *lock)
+void inline __sched mutex_lock(struct mutex *lock)
{
might_sleep();
/*
}
EXPORT_SYMBOL(mutex_lock);
+#endif
-static void fastcall noinline __sched
-__mutex_unlock_slowpath(atomic_t *lock_count);
+static __used noinline void __sched __mutex_unlock_slowpath(atomic_t *lock_count);
/***
* mutex_unlock - release the mutex
*
* This function is similar to (but not equivalent to) up().
*/
-void fastcall __sched mutex_unlock(struct mutex *lock)
+void __sched mutex_unlock(struct mutex *lock)
{
/*
* The unlocking fastpath is the 0->1 transition from 'locked'
* 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);
- mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
- 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
* got a signal? (This code gets eliminated in the
* TASK_UNINTERRUPTIBLE case.)
*/
- if (unlikely(state == TASK_INTERRUPTIBLE &&
- signal_pending(task))) {
- mutex_remove_waiter(lock, &waiter, task->thread_info);
- mutex_release(&lock->dep_map, 1, _RET_IP_);
+ if (unlikely(signal_pending_state(state, task))) {
+ 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, ip);
/* 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)
-{
- struct mutex *lock = container_of(lock_count, struct mutex, count);
-
- __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, 0);
-}
-
#ifdef CONFIG_DEBUG_LOCK_ALLOC
void __sched
mutex_lock_nested(struct mutex *lock, unsigned int subclass)
{
might_sleep();
- __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, subclass);
+ __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, subclass, _RET_IP_);
}
EXPORT_SYMBOL_GPL(mutex_lock_nested);
+
+int __sched
+mutex_lock_killable_nested(struct mutex *lock, unsigned int subclass)
+{
+ might_sleep();
+ return __mutex_lock_common(lock, TASK_KILLABLE, subclass, _RET_IP_);
+}
+EXPORT_SYMBOL_GPL(mutex_lock_killable_nested);
+
+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
+static inline void
__mutex_unlock_common_slowpath(atomic_t *lock_count, int nested)
{
struct mutex *lock = container_of(lock_count, struct mutex, count);
/*
* Release the lock, slowpath:
*/
-static fastcall noinline void
+static __used noinline void
__mutex_unlock_slowpath(atomic_t *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().
*/
-static int fastcall noinline __sched
+static noinline int __sched
+__mutex_lock_killable_slowpath(atomic_t *lock_count);
+
+static noinline int __sched
__mutex_lock_interruptible_slowpath(atomic_t *lock_count);
/***
*
* This function is similar to (but not equivalent to) down_interruptible().
*/
-int fastcall __sched mutex_lock_interruptible(struct mutex *lock)
+int __sched mutex_lock_interruptible(struct mutex *lock)
{
might_sleep();
return __mutex_fastpath_lock_retval
EXPORT_SYMBOL(mutex_lock_interruptible);
-static int fastcall noinline __sched
+int __sched mutex_lock_killable(struct mutex *lock)
+{
+ might_sleep();
+ return __mutex_fastpath_lock_retval
+ (&lock->count, __mutex_lock_killable_slowpath);
+}
+EXPORT_SYMBOL(mutex_lock_killable);
+
+static __used noinline void __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 noinline int __sched
+__mutex_lock_killable_slowpath(atomic_t *lock_count)
+{
+ struct mutex *lock = container_of(lock_count, struct mutex, count);
+
+ return __mutex_lock_common(lock, TASK_KILLABLE, 0, _RET_IP_);
+}
+
+static noinline int __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
* This function must not be used in interrupt context. The
* mutex must be released by the same task that acquired it.
*/
-int fastcall __sched mutex_trylock(struct mutex *lock)
+int __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