diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2014-05-22 03:25:47 +0000 |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2014-06-21 22:05:30 +0200 |
commit | 8930ed80f970a90a795239e7415c9b0e6f964649 (patch) | |
tree | 10463885f150543faaaf621e7ff85bbe6a81c911 /kernel/locking/rtmutex_common.h | |
parent | c051b21f71d1ffdfd7ad406a1ef5ede5e5f974c5 (diff) | |
download | blackbird-op-linux-8930ed80f970a90a795239e7415c9b0e6f964649.tar.gz blackbird-op-linux-8930ed80f970a90a795239e7415c9b0e6f964649.zip |
rtmutex: Cleanup deadlock detector debug logic
The conditions under which deadlock detection is conducted are unclear
and undocumented.
Add constants instead of using 0/1 and provide a selection function
which hides the additional debug dependency from the calling code.
Add comments where needed.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Link: http://lkml.kernel.org/r/20140522031949.947264874@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/locking/rtmutex_common.h')
-rw-r--r-- | kernel/locking/rtmutex_common.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h index cd3ec209d0c8..855212501407 100644 --- a/kernel/locking/rtmutex_common.h +++ b/kernel/locking/rtmutex_common.h @@ -102,6 +102,21 @@ static inline struct task_struct *rt_mutex_owner(struct rt_mutex *lock) } /* + * 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.): */ extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock); |