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authorJ. Bruce Fields <bfields@citi.umich.edu>2008-04-07 15:59:05 -0400
committerJonathan Corbet <corbet@lwn.net>2008-04-11 13:17:46 -0600
commitdc07e721a26ec7e0adb66340f1763d220cfbbd0c (patch)
treeb31b5d9d826c4b2e161a0f3e833dab95abb5f6c1
parentb40b5162ac4e5b94d16cd9fb0a87168b1633c7dd (diff)
Spell out behavior of atomic_dec_and_lock() in kerneldoc
A little more detail here wouldn't hurt. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
-rw-r--r--include/linux/spinlock.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 576a5f77d3b..1129ee0a718 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) \