Commit 015680aa authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
Browse files

preempt: Adjust PREEMPT_LOCK_OFFSET for RT 



On PREEMPT_RT regular spinlocks and rwlocks are substituted with rtmutex
based constructs. spin/rwlock held regions are preemptible on PREEMPT_RT,
so PREEMPT_LOCK_OFFSET has to be 0 to make the various cond_resched_*lock()
functions work correctly.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211305.804246275@linutronix.de
parent 51711e82

include/linux/preempt.h

+4 −0
Original line number Diff line number Diff line
@@ -121,7 +121,11 @@ 
/*

 * The preempt_count offset after spin_lock()

 */

#if !defined(CONFIG_PREEMPT_RT)

#define PREEMPT_LOCK_OFFSET	PREEMPT_DISABLE_OFFSET

#else

#define PREEMPT_LOCK_OFFSET	0

#endif



/*

 * The preempt_count offset needed for things like: