From 3d5c9340d1949733eb37616abd15db36aef9a57c Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 5 Jun 2014 12:34:23 +0200 Subject: rtmutex: Handle deadlock detection smarter Even in the case when deadlock detection is not requested by the caller, we can detect deadlocks. Right now the code stops the lock chain walk and keeps the waiter enqueued, even on itself. Silly not to yell when such a scenario is detected and to keep the waiter enqueued. Return -EDEADLK unconditionally and handle it at the call sites. The futex calls return -EDEADLK. The non futex ones dequeue the waiter, throw a warning and put the task into a schedule loop. Tagged for stable as it makes the code more robust. Signed-off-by: Thomas Gleixner Cc: Steven Rostedt Cc: Peter Zijlstra Cc: Brad Mouring Link: http://lkml.kernel.org/r/20140605152801.836501969@linutronix.de Cc: stable@vger.kernel.org Signed-off-by: Thomas Gleixner --- kernel/locking/rtmutex-debug.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'kernel/locking/rtmutex-debug.h') diff --git a/kernel/locking/rtmutex-debug.h b/kernel/locking/rtmutex-debug.h index 14193d596d7..ab29b6a2266 100644 --- a/kernel/locking/rtmutex-debug.h +++ b/kernel/locking/rtmutex-debug.h @@ -31,3 +31,8 @@ static inline int debug_rt_mutex_detect_deadlock(struct rt_mutex_waiter *waiter, { return (waiter != NULL); } + +static inline void rt_mutex_print_deadlock(struct rt_mutex_waiter *w) +{ + debug_rt_mutex_print_deadlock(w); +} -- cgit v1.2.3-70-g09d2