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authorLinus Torvalds <torvalds@linux-foundation.org>2008-04-11 13:24:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-11 13:24:16 -0700
commit14897e35fdc045fff9baabf0354570da22386706 (patch)
tree32cf1fcd7696e2018a05f2e4f8d5d20166af21ab /include/linux
parentb0fac02370cffad956ff3de5e8ed4df7e7b875d7 (diff)
parent14dadf1d5eb5bea2dd115852cfee880505c1c169 (diff)
Merge branch 'docs' of git://git.lwn.net/linux-2.6
* 'docs' of git://git.lwn.net/linux-2.6: Add additional examples in Documentation/spinlocks.txt Move sched-rt-group.txt to scheduler/ Documentation: move rpc-cache.txt to filesystems/ Documentation: move nfsroot.txt to filesystems/ Spell out behavior of atomic_dec_and_lock() in kerneldoc Fix a typo in highres.txt Fixes to the seq_file document Fill out information on patch tags in SubmittingPatches Add the seq_file documentation
Diffstat (limited to 'include/linux')
-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) \