diff --git a/[refs] b/[refs]
index 5c42b37a5f68..564c4fb354c6 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b40b5162ac4e5b94d16cd9fb0a87168b1633c7dd
+refs/heads/master: dc07e721a26ec7e0adb66340f1763d220cfbbd0c
diff --git a/trunk/include/linux/spinlock.h b/trunk/include/linux/spinlock.h
index 576a5f77d3bd..1129ee0a7180 100644
--- a/trunk/include/linux/spinlock.h
+++ b/trunk/include/linux/spinlock.h
@@ -341,6 +341,9 @@ static inline void double_spin_unlock(spinlock_t *l1, spinlock_t *l2,
  * atomic_dec_and_lock - lock on reaching reference count zero
  * @atomic: the atomic counter
  * @lock: the spinlock in question
+ *
+ * Decrements @atomic by 1.  If the result is 0, returns true and locks
+ * @lock.  Returns false for all other cases.
  */
 extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
 #define atomic_dec_and_lock(atomic, lock) \