From: Thomas Gleixner Date: Thu, 9 Jun 2011 11:43:52 +0200 Subject: [PATCH 135/353] rtmutex: Add rtmutex_lock_killable() Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=6d3b7dcdca0aece78c9009364661eb06688b6933 Add "killable" type to rtmutex. We need this since rtmutex are used as "normal" mutexes which do use this type. Signed-off-by: Thomas Gleixner --- include/linux/rtmutex.h | 1 + kernel/locking/rtmutex.c | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h index 6fd615a0eea9..81ece6a8291a 100644 --- a/include/linux/rtmutex.h +++ b/include/linux/rtmutex.h @@ -115,6 +115,7 @@ extern void rt_mutex_lock(struct rt_mutex *lock); #endif extern int rt_mutex_lock_interruptible(struct rt_mutex *lock); +extern int rt_mutex_lock_killable(struct rt_mutex *lock); extern int rt_mutex_timed_lock(struct rt_mutex *lock, struct hrtimer_sleeper *timeout); diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index 069f025180b8..81bae2e3d82e 100644 --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -1562,6 +1562,25 @@ int __sched __rt_mutex_futex_trylock(struct rt_mutex *lock) return __rt_mutex_slowtrylock(lock); } +/** + * rt_mutex_lock_killable - lock a rt_mutex killable + * + * @lock: the rt_mutex to be locked + * @detect_deadlock: deadlock detection on/off + * + * Returns: + * 0 on success + * -EINTR when interrupted by a signal + * -EDEADLK when the lock would deadlock (when deadlock detection is on) + */ +int __sched rt_mutex_lock_killable(struct rt_mutex *lock) +{ + might_sleep(); + + return rt_mutex_fastlock(lock, TASK_KILLABLE, rt_mutex_slowlock); +} +EXPORT_SYMBOL_GPL(rt_mutex_lock_killable); + /** * rt_mutex_timed_lock - lock a rt_mutex interruptible * the timeout structure is provided