From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 9 Nov 2018 15:02:49 +0100
Subject: rcu: make RCU_BOOST default on RT without EXPERT
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
Git-commit: 1c4ed541ddedc907319ce37bd2444266cd5eb494
Patch-mainline: Queued in subsystem maintainer repository
References: SLE Realtime Extension

[ Upstream commit 78cab7cb632b6a4c84e78e4f12bb9e83c09b8885 ]

Paul E. McKenney suggested to allow enabling RCU_BOOST on RT without the
need to go through the EXPERT option first.

Suggeted-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
---
 init/Kconfig |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/init/Kconfig
+++ b/init/Kconfig
@@ -506,7 +506,7 @@ config TINY_RCU
 
 config RCU_EXPERT
 	bool "Make expert-level adjustments to RCU configuration"
-	default y if PREEMPT_RT_FULL
+	default n
 	help
 	  This option needs to be enabled if you wish to make
 	  expert-level adjustments to RCU configuration.  By default,
@@ -679,7 +679,7 @@ config RCU_FAST_NO_HZ
 
 config RCU_BOOST
 	bool "Enable RCU priority boosting"
-	depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT
+	depends on (RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT) || PREEMPT_RT_FULL
 	default y if PREEMPT_RT_FULL
 	help
 	  This option boosts the priority of preempted RCU readers that