Subject: rt: Provide PREEMPT_RT_BASE config switch
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 17 Jun 2011 12:39:57 +0200

Introduce PREEMPT_RT_BASE which enables parts of
PREEMPT_RT_FULL. Forces interrupt threading and enables some of the RT
substitutions for testing.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/Kconfig.preempt |   19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -1,3 +1,10 @@
+config PREEMPT
+	bool
+	select PREEMPT_COUNT
+
+config PREEMPT_RT_BASE
+	bool
+	select PREEMPT
 
 choice
 	prompt "Preemption Model"
@@ -33,9 +40,9 @@ config PREEMPT_VOLUNTARY
 
 	  Select this if you are building a kernel for a desktop system.
 
-config PREEMPT
+config PREEMPT__LL
 	bool "Preemptible Kernel (Low-Latency Desktop)"
-	select PREEMPT_COUNT
+	select PREEMPT
 	select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
 	help
 	  This option reduces the latency of the kernel by making
@@ -52,6 +59,14 @@ config PREEMPT
 	  embedded system with latency requirements in the milliseconds
 	  range.
 
+config PREEMPT_RTB
+	bool "Preemptible Kernel (Basic RT)"
+	select PREEMPT_RT_BASE
+	help
+	  This option is basically the same as (Low-Latency Desktop) but
+	  enables changes which are preliminary for the full preemptible
+	  RT kernel.
+
 endchoice
 
 config PREEMPT_COUNT