A little more detail here wouldn't hurt.

Signed-off-by: J. Bruce Fields
---
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

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