Merge branch 'core/locking' into perfcounters/core

Merge reason: we moved a mutex.h commit that originated from the
              perfcounters tree into core/locking - but now merge
	      back that branch to solve a merge artifact and to
	      pick up cleanups of this commit that happened in
	      core/locking.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 23 deletions

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 93054fc3635c..878cab4f5fcc 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -150,28 +150,6 @@ extern int __must_check mutex_lock_killable(struct mutex *lock);
  */
 extern int mutex_trylock(struct mutex *lock);
 extern void mutex_unlock(struct mutex *lock);
-
-/**
- * atomic_dec_and_mutex_lock - return holding mutex if we dec to 0
- * @cnt: the atomic which we are to dec
- * @lock: the mutex to return holding if we dec to 0
- *
- * return true and hold lock if we dec to 0, return false otherwise
- */
-static inline int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock)
-{
-        /* dec if we can't possibly hit 0 */
-        if (atomic_add_unless(cnt, -1, 1))
-                return 0;
-        /* we might hit 0, so take the lock */
-        mutex_lock(lock);
-        if (!atomic_dec_and_test(cnt)) {
-                /* when we actually did the dec, we didn't hit 0 */
-                mutex_unlock(lock);
-                return 0;
-        }
-        /* we hit 0, and we hold the lock */
-        return 1;
-}
+extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);
 
 #endif