Commit a461d587 authored May 27, 2016 by Sebastian Andrzej Siewior Committed by Ingo Molnar Jun 08, 2016

locking/rtmutex: Only warn once on a trylock from bad context



One warning should be enough to get one motivated to fix this. It is
possible that this happens more than once and that starts flooding the
output. Later the prints will be suppressed so we only get half of it.
Depending on the console system used it might not be helpful.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1464356838-1755-1-git-send-email-bigeasy@linutronix.de


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent dfaaf3fa

kernel/locking/rtmutex.c

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -1478,7 +1478,7 @@ EXPORT_SYMBOL_GPL(rt_mutex_timed_lock);
	*/		*/
	int __sched rt_mutex_trylock(struct rt_mutex *lock)		int __sched rt_mutex_trylock(struct rt_mutex *lock)
	{		{
	if (WARN_ON(in_irq() \|\| in_nmi() \|\| in_serving_softirq()))		if (WARN_ON_ONCE(in_irq() \|\| in_nmi() \|\| in_serving_softirq()))
	return 0;		return 0;

	return rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock);		return rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock);

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