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authorIngo Molnar <mingo@elte.hu>2006-07-03 00:24:55 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:04 -0700
commitef5d4707b9065c0cf8a69fa3716893f3b75201ba (patch)
tree9ec92f31356bf404486c1b26df9fa40bd784f983 /kernel/mutex.c
parent8a25d5debff2daee280e83e09d8c25d67c26a972 (diff)
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[PATCH] lockdep: prove mutex locking correctness
Use the lock validator framework to prove mutex locking correctness. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/mutex.c')
-rw-r--r--kernel/mutex.c28
1 files changed, 22 insertions, 6 deletions
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 43a50c18701..8c71cf72a49 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -39,13 +39,14 @@
*
* 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);
@@ -131,6 +132,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
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);
/* add waiting tasks to the end of the waitqueue (FIFO): */
@@ -158,6 +160,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
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);
@@ -194,16 +197,28 @@ __mutex_lock_slowpath(atomic_t *lock_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);
+}
+
+EXPORT_SYMBOL_GPL(mutex_lock_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);
/*
@@ -236,7 +251,7 @@ __mutex_unlock_common_slowpath(atomic_t *lock_count)
static fastcall noinline void
__mutex_unlock_slowpath(atomic_t *lock_count)
{
- __mutex_unlock_common_slowpath(lock_count);
+ __mutex_unlock_common_slowpath(lock_count, 1);
}
/*
@@ -287,9 +302,10 @@ static inline int __mutex_trylock_slowpath(atomic_t *lock_count)
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);