x86_64: prepare idle loop for dynamic ticks
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.
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 9895655..6f9dbbe 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -38,6 +38,7 @@
#include <linux/notifier.h>
#include <linux/kprobes.h>
#include <linux/kdebug.h>
+#include <linux/tick.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
@@ -208,6 +209,8 @@
if (__get_cpu_var(cpu_idle_state))
__get_cpu_var(cpu_idle_state) = 0;
+ tick_nohz_stop_sched_tick();
+
rmb();
idle = pm_idle;
if (!idle)
@@ -228,6 +231,7 @@
__exit_idle();
}
+ tick_nohz_restart_sched_tick();
preempt_enable_no_resched();
schedule();
preempt_disable();