rtmutex: Cleanup deadlock detector debug logic

[deliverable/linux.git] / kernel / locking / rtmutex_common.h

diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h
index cd3ec209d0c8fc4cd9afeba88d4f39d9e309fe5f..8552125014073cf07d7fd30428c232a21998048d 100644 (file)
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -101,6 +101,21 @@ static inline struct task_struct *rt_mutex_owner(struct rt_mutex *lock)
                ((unsigned long)lock->owner & ~RT_MUTEX_OWNER_MASKALL);
 }
 
+/*
+ * Constants for rt mutex functions which have a selectable deadlock
+ * detection.
+ *
+ * RT_MUTEX_MIN_CHAINWALK:     Stops the lock chain walk when there are
+ *                             no further PI adjustments to be made.
+ *
+ * RT_MUTEX_FULL_CHAINWALK:    Invoke deadlock detection with a full
+ *                             walk of the lock chain.
+ */
+enum rtmutex_chainwalk {
+       RT_MUTEX_MIN_CHAINWALK,
+       RT_MUTEX_FULL_CHAINWALK,
+};
+
 /*
  * PI-futex support (proxy locking functions, etc.):
  */