From 015680aa4c5d784513d0a9728bc52ec7c4a64227 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 15 Aug 2021 23:29:22 +0200
Subject: [PATCH] preempt: Adjust PREEMPT_LOCK_OFFSET for RT
Git-commit: 015680aa4c5d784513d0a9728bc52ec7c4a64227
Patch-mainline: v5.15-rc1
References: bsc#1190137 bsc#1189998

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
Signed-off-by: Davidlohr Bueso <dbueso@suse.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:
-- 
2.26.2