Fix compile and link of patch-2.6.20-rc6-rt4 for ARM.

Signed-off-by: Dirk Behme <dirk.behme@gmail.com>

Index: linux-osk/arch/arm/kernel/process.c
===================================================================
--- linux-osk.orig/arch/arm/kernel/process.c
+++ linux-osk/arch/arm/kernel/process.c
@@ -28,6 +28,7 @@
 #include <linux/cpu.h>
 #include <linux/elfcore.h>
 #include <linux/pm.h>
+#include <linux/tick.h>
 
 #include <asm/leds.h>
 #include <asm/processor.h>
@@ -154,11 +155,11 @@ void cpu_idle(void)
 		if (!idle)
 			idle = default_idle;
 		leds_event(led_idle_start);
-		hrtimer_stop_sched_tick();
+		tick_nohz_stop_sched_tick();
 		while (!need_resched() && !need_resched_delayed())
 			idle();
 		leds_event(led_idle_end);
-		hrtimer_restart_sched_tick();
+		tick_nohz_restart_sched_tick();
 		local_irq_disable();
 		__preempt_enable_no_resched();
 		__schedule();
Index: linux-osk/kernel/time/tick-sched.c
===================================================================
--- linux-osk.orig/kernel/time/tick-sched.c
+++ linux-osk/kernel/time/tick-sched.c
@@ -20,6 +20,7 @@
 #include <linux/profile.h>
 #include <linux/sched.h>
 #include <linux/tick.h>
+#include <asm/irq_regs.h>
 
 #include "tick-internal.h"