Subject: rcu: Disable RCU_FAST_NO_HZ on RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 28 Oct 2012 13:26:09 +0000

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>
Cc: stable-rt@vger.kernel.org
---
 init/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-stable/init/Kconfig
===================================================================
--- linux-stable.orig/init/Kconfig
+++ linux-stable/init/Kconfig
@@ -504,7 +504,7 @@ config RCU_FANOUT_EXACT
 
 config RCU_FAST_NO_HZ
 	bool "Accelerate last non-dyntick-idle CPU's grace periods"
-	depends on NO_HZ && SMP
+	depends on NO_HZ && SMP && !PREEMPT_RT_FULL
 	default n
 	help
 	  This option causes RCU to attempt to accelerate grace periods