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| author | Andrew Morton <akpm@linux-foundation.org> | 2009-04-30 00:59:58 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-30 09:01:34 +0200 |
| commit | a511e3f968c462a55ef58697257f5347c73d306e (patch) | |
| tree | 7b331c694e0149f4f9e692eaec1726d28cedac8d /include | |
| parent | locking, rtmutex.c: Documentation cleanup (diff) | |
| download | linux-a511e3f968c462a55ef58697257f5347c73d306e.tar.xz linux-a511e3f968c462a55ef58697257f5347c73d306e.zip | |
mutex: add atomic_dec_and_mutex_lock(), fix
include/linux/mutex.h:136: warning: 'mutex_lock' declared inline after being called
include/linux/mutex.h:136: warning: previous declaration of 'mutex_lock' was here
uninline it.
[ Impact: clean up and uninline, address compiler warning ]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Eric Paris <eparis@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <200904292318.n3TNIsi6028340@imap1.linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mutex.h | 24 |
1 files changed, 1 insertions, 23 deletions
diff --git a/include/linux/mutex.h b/include/linux/mutex.h index 93054fc3635c..878cab4f5fcc 100644 --- a/include/linux/mutex.h +++ b/include/linux/mutex.h @@ -150,28 +150,6 @@ extern int __must_check mutex_lock_killable(struct mutex *lock); */ extern int mutex_trylock(struct mutex *lock); extern void mutex_unlock(struct mutex *lock); - -/** - * atomic_dec_and_mutex_lock - return holding mutex if we dec to 0 - * @cnt: the atomic which we are to dec - * @lock: the mutex to return holding if we dec to 0 - * - * return true and hold lock if we dec to 0, return false otherwise - */ -static inline int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock) -{ - /* dec if we can't possibly hit 0 */ - if (atomic_add_unless(cnt, -1, 1)) - return 0; - /* we might hit 0, so take the lock */ - mutex_lock(lock); - if (!atomic_dec_and_test(cnt)) { - /* when we actually did the dec, we didn't hit 0 */ - mutex_unlock(lock); - return 0; - } - /* we hit 0, and we hold the lock */ - return 1; -} +extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock); #endif |