[RFC PATCH 4/5] x86_64: prep idle loop for dynticks

[Chris Wright]

Add tick_nohz_{stop,restart}_sched_tick to idle
loop in prepartion for turning on dynticks.  These
are just noops until NO_HZ is enabled in next patch.

Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: john stultz <johnstul@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
---
 arch/x86_64/kernel/process.c |    3 +++
 1 file changed, 3 insertions(+)

--- linus-2.6.orig/arch/x86_64/kernel/process.c
+++ linus-2.6/arch/x86_64/kernel/process.c
@@ -36,6 +36,7 @@
 #include <linux/random.h>
 #include <linux/notifier.h>
 #include <linux/kprobes.h>
+#include <linux/tick.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -201,6 +202,7 @@ void cpu_idle (void)
 	current_thread_info()->status |= TS_POLLING;
 	/* endless idle loop with no priority at all */
 	while (1) {
+		tick_nohz_stop_sched_tick();
 		while (!need_resched()) {
 			void (*idle)(void);
 
@@ -227,6 +229,7 @@ void cpu_idle (void)
 			__exit_idle();
 		}
 
+		tick_nohz_restart_sched_tick();
 		preempt_enable_no_resched();
 		schedule();
 		preempt_disable();

--
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