Commit c2c360ed authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
Browse files

locking/rtmutex: Restrict the trylock WARN_ON() to debug 



The warning as written is expensive and not really required for a
production kernel. Make it depend on rt mutex debugging and use !in_task()
for the condition which generates far better code and gives the same
answer.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210326153944.436565064@linutronix.de
parent 82cd5b10

kernel/locking/rtmutex.c

+1 −1
Original line number Diff line number Diff line
@@ -1456,7 +1456,7 @@ int __sched rt_mutex_trylock(struct rt_mutex *lock) 
{

	int ret;



	if (WARN_ON_ONCE(in_irq() || in_nmi() || in_serving_softirq()))

	if (IS_ENABLED(CONFIG_DEBUG_RT_MUTEXES) && WARN_ON_ONCE(!in_task()))

		return 0;



	/*