patches/0007-locking-rtmutex-Add-rtmutex_lock_killable.patch

From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 9 Jun 2011 11:43:52 +0200
Subject: [PATCH 07/23] locking/rtmutex: Add rtmutex_lock_killable()

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 <tglx@linutronix.de>
---
 include/linux/rtmutex.h  |    1 +
 kernel/locking/rtmutex.c |   17 +++++++++++++++++
 2 files changed, 18 insertions(+)

--- a/include/linux/rtmutex.h
+++ b/include/linux/rtmutex.h
@@ -99,6 +99,7 @@ extern void rt_mutex_lock(struct rt_mute
 #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_trylock(struct rt_mutex *lock);
 
 extern void rt_mutex_unlock(struct rt_mutex *lock);
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1538,6 +1538,23 @@ int __sched __rt_mutex_futex_trylock(str
 }
 
 /**
+ * rt_mutex_lock_killable - lock a rt_mutex killable
+ *
+ * @lock:		the rt_mutex to be locked
+ *
+ * Returns:
+ *  0		on success
+ * -EINTR	when interrupted by a signal
+ */
+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_trylock - try to lock a rt_mutex
  *
  * @lock:	the rt_mutex to be locked