vga16fb, drm: vga16fb->drm handoff

[safe/jmp/linux-2.6] / include / linux / mutex.h

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index bc6da10..878cab4 100644 (file)
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -50,8 +50,10 @@ struct mutex {
        atomic_t                count;
        spinlock_t              wait_lock;
        struct list_head        wait_list;
-#ifdef CONFIG_DEBUG_MUTEXES
+#if defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_SMP)
        struct thread_info      *owner;
+#endif
+#ifdef CONFIG_DEBUG_MUTEXES
        const char              *name;
        void                    *magic;
 #endif
@@ -68,7 +70,6 @@ struct mutex_waiter {
        struct list_head        list;
        struct task_struct      *task;
 #ifdef CONFIG_DEBUG_MUTEXES
-       struct mutex            *lock;
        void                    *magic;
 #endif
 };
@@ -144,8 +145,11 @@ extern int __must_check mutex_lock_killable(struct mutex *lock);
 /*
  * NOTE: mutex_trylock() follows the spin_trylock() convention,
  *       not the down_trylock() convention!
+ *
+ * Returns 1 if the mutex has been acquired successfully, and 0 on contention.
  */
 extern int mutex_trylock(struct mutex *lock);
 extern void mutex_unlock(struct mutex *lock);
+extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);
 
 #endif