Subject: rcu: Disable RCU_FAST_NO_HZ on RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 28 Oct 2012 13:26:09 +0000
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.6/older/patches-4.6.2-rt5.tar.xz

This uses a timer_list timer from the irq disabled guts of the idle
code. Disable it for now to prevent wreckage.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 init/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/init/Kconfig
+++ b/init/Kconfig
@@ -610,7 +610,7 @@ config RCU_FANOUT_LEAF
 
 config RCU_FAST_NO_HZ
 	bool "Accelerate last non-dyntick-idle CPU's grace periods"
-	depends on NO_HZ_COMMON && SMP && RCU_EXPERT
+	depends on NO_HZ_COMMON && SMP && RCU_EXPERT && !PREEMPT_RT_FULL
 	default n
 	help
 	  This option permits CPUs to enter dynticks-idle state even if
