#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
+#include <linux/debug_locks.h>
/*
* In the DEBUG case we are using the "NULL fastpath" for mutexes,
*
* It is not allowed to initialize an already locked mutex.
*/
-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);
* branch is predicted by the CPU as default-untaken.
*/
static void fastcall noinline __sched
-__mutex_lock_slowpath(atomic_t *lock_count __IP_DECL__);
+__mutex_lock_slowpath(atomic_t *lock_count);
/***
* mutex_lock - acquire the mutex
*
* This function is similar to (but not equivalent to) down().
*/
-void fastcall __sched mutex_lock(struct mutex *lock)
+void inline fastcall __sched mutex_lock(struct mutex *lock)
{
might_sleep();
/*
EXPORT_SYMBOL(mutex_lock);
static void fastcall noinline __sched
-__mutex_unlock_slowpath(atomic_t *lock_count __IP_DECL__);
+__mutex_unlock_slowpath(atomic_t *lock_count);
/***
* mutex_unlock - release the mutex
* Lock a mutex (possibly interruptible), slowpath:
*/
static inline int __sched
-__mutex_lock_common(struct mutex *lock, long state __IP_DECL__)
+__mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
{
struct task_struct *task = current;
struct mutex_waiter waiter;
unsigned int old_val;
unsigned long flags;
- debug_mutex_init_waiter(&waiter);
-
spin_lock_mutex(&lock->wait_lock, flags);
- debug_mutex_add_waiter(lock, &waiter, task->thread_info, ip);
+ debug_mutex_lock_common(lock, &waiter);
+ mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+ debug_mutex_add_waiter(lock, &waiter, task->thread_info);
/* add waiting tasks to the end of the waitqueue (FIFO): */
list_add_tail(&waiter.list, &lock->wait_list);
if (unlikely(state == TASK_INTERRUPTIBLE &&
signal_pending(task))) {
mutex_remove_waiter(lock, &waiter, task->thread_info);
+ mutex_release(&lock->dep_map, 1, _RET_IP_);
spin_unlock_mutex(&lock->wait_lock, flags);
debug_mutex_free_waiter(&waiter);
/* got the lock - rejoice! */
mutex_remove_waiter(lock, &waiter, task->thread_info);
- debug_mutex_set_owner(lock, task->thread_info __IP__);
+ debug_mutex_set_owner(lock, task->thread_info);
/* set it to 0 if there are no waiters left: */
if (likely(list_empty(&lock->wait_list)))
debug_mutex_free_waiter(&waiter);
- DEBUG_WARN_ON(list_empty(&lock->held_list));
- DEBUG_WARN_ON(lock->owner != task->thread_info);
-
return 0;
}
static void fastcall noinline __sched
-__mutex_lock_slowpath(atomic_t *lock_count __IP_DECL__)
+__mutex_lock_slowpath(atomic_t *lock_count)
{
struct mutex *lock = container_of(lock_count, struct mutex, count);
- __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE __IP__);
+ __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);
}
+EXPORT_SYMBOL_GPL(mutex_lock_nested);
+#endif
+
/*
* Release the lock, slowpath:
*/
-static fastcall noinline void
-__mutex_unlock_slowpath(atomic_t *lock_count __IP_DECL__)
+static fastcall inline void
+__mutex_unlock_common_slowpath(atomic_t *lock_count, int nested)
{
struct mutex *lock = container_of(lock_count, struct mutex, count);
unsigned long flags;
- DEBUG_WARN_ON(lock->owner != current_thread_info());
-
spin_lock_mutex(&lock->wait_lock, flags);
+ mutex_release(&lock->dep_map, nested, _RET_IP_);
+ debug_mutex_unlock(lock);
/*
* some architectures leave the lock unlocked in the fastpath failure
if (__mutex_slowpath_needs_to_unlock())
atomic_set(&lock->count, 1);
- debug_mutex_unlock(lock);
-
if (!list_empty(&lock->wait_list)) {
/* get the first entry from the wait-list: */
struct mutex_waiter *waiter =
spin_unlock_mutex(&lock->wait_lock, flags);
}
+/*
+ * Release the lock, slowpath:
+ */
+static fastcall noinline void
+__mutex_unlock_slowpath(atomic_t *lock_count)
+{
+ __mutex_unlock_common_slowpath(lock_count, 1);
+}
+
/*
* Here come the less common (and hence less performance-critical) APIs:
* mutex_lock_interruptible() and mutex_trylock().
*/
static int fastcall noinline __sched
-__mutex_lock_interruptible_slowpath(atomic_t *lock_count __IP_DECL__);
+__mutex_lock_interruptible_slowpath(atomic_t *lock_count);
/***
* mutex_lock_interruptible - acquire the mutex, interruptable
EXPORT_SYMBOL(mutex_lock_interruptible);
static int fastcall noinline __sched
-__mutex_lock_interruptible_slowpath(atomic_t *lock_count __IP_DECL__)
+__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 __IP__);
+ return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, 0);
}
/*
spin_lock_mutex(&lock->wait_lock, flags);
prev = atomic_xchg(&lock->count, -1);
- if (likely(prev == 1))
- debug_mutex_set_owner(lock, current_thread_info() __RET_IP__);
+ 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.openpandora.org / pandora-kernel.git / blobdiff