[POWERPC] Enable tickless idle and high res timers for powerpc

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 10 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a46f8116f476..b387e1ed5177 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -173,6 +173,7 @@ config HIGHMEM
         bool "High memory support"
         depends on PPC32
 
+source kernel/time/Kconfig
 source kernel/Kconfig.hz
 source kernel/Kconfig.preempt
 source "fs/Kconfig.binfmt"
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
index a9e9cbd32975..abd2957fe537 100644
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -24,6 +24,7 @@
 #include <linux/smp.h>
 #include <linux/cpu.h>
 #include <linux/sysctl.h>
+#include <linux/tick.h>
 
 #include <asm/system.h>
 #include <asm/processor.h>
@@ -59,6 +60,7 @@ void cpu_idle(void)
 
         set_thread_flag(TIF_POLLING_NRFLAG);
         while (1) {
+                tick_nohz_stop_sched_tick();
                 while (!need_resched() && !cpu_should_die()) {
                         ppc64_runlatch_off();
 
@@ -90,6 +92,7 @@ void cpu_idle(void)
 
                 HMT_medium();
                 ppc64_runlatch_on();
+                tick_nohz_restart_sched_tick();
                 if (cpu_should_die())
                         cpu_die();
                 preempt_enable_no_resched();
diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index fad493e29d37..37ae07ee54a9 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -26,6 +26,8 @@
 #include <linux/major.h>
 #include <linux/root_dev.h>
 #include <linux/kernel.h>
+#include <linux/hrtimer.h>
+#include <linux/tick.h>
 
 #include <asm/processor.h>
 #include <asm/machdep.h>
@@ -561,6 +563,7 @@ static void yield_shared_processor(void)
 static void iseries_shared_idle(void)
 {
         while (1) {
+                tick_nohz_stop_sched_tick();
                 while (!need_resched() && !hvlpevent_is_pending()) {
                         local_irq_disable();
                         ppc64_runlatch_off();
@@ -574,6 +577,7 @@ static void iseries_shared_idle(void)
                 }
 
                 ppc64_runlatch_on();
+                tick_nohz_restart_sched_tick();
 
                 if (hvlpevent_is_pending())
                         process_iSeries_events();
@@ -589,6 +593,7 @@ static void iseries_dedicated_idle(void)
         set_thread_flag(TIF_POLLING_NRFLAG);
 
         while (1) {
+                tick_nohz_stop_sched_tick();
                 if (!need_resched()) {
                         while (!need_resched()) {
                                 ppc64_runlatch_off();
@@ -605,6 +610,7 @@ static void iseries_dedicated_idle(void)
                 }
 
                 ppc64_runlatch_on();
+                tick_nohz_restart_sched_tick();
                 preempt_enable_no_resched();
                 schedule();
                 preempt_disable();