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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: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211305.804246275@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-08-15 23:29:22 +02:00 committed by Ingo Molnar
parent 51711e825a
commit 015680aa4c
1 changed files with 4 additions and 0 deletions
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4
include/linux/preempt.h
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@ -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: