[PATCH] Spell out behavior of atomic_dec_and_lock() in kerneldoc

["J. Bruce Fields" <bfields@citi.umich.edu>]

A little more detail here wouldn't hurt.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
---
 include/linux/spinlock.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 576a5f7..1129ee0 100644
--- a/include/linux/spinlock.h
+++ b/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) \
-- 
1.5.5.rc1