From 015680aa4c5d784513d0a9728bc52ec7c4a64227 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Sun, 15 Aug 2021 23:29:22 +0200 Subject: [PATCH] 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 Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20210815211305.804246275@linutronix.de --- include/linux/preempt.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/preempt.h b/include/linux/preempt.h index 9881eac0698f..4d244e295e85 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -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: -- 2.20.1