[PATCH 4/4] ARM: Move leds idle start/stop calls to sched idle notifiers
Anton Vorontsov
anton.vorontsov at linaro.org
Tue Feb 7 20:44:52 EST 2012
From: Todd Poynor <toddpoynor at google.com>
Signed-off-by: Todd Poynor <toddpoynor at google.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov at linaro.org>
---
arch/arm/kernel/leds.c | 25 ++++++++++++++++++++++++-
arch/arm/kernel/process.c | 3 ---
2 files changed, 24 insertions(+), 4 deletions(-)
diff --git a/arch/arm/kernel/leds.c b/arch/arm/kernel/leds.c
index 1911dae..fbc30d4 100644
--- a/arch/arm/kernel/leds.c
+++ b/arch/arm/kernel/leds.c
@@ -9,6 +9,8 @@
*/
#include <linux/export.h>
#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/syscore_ops.h>
#include <linux/string.h>
@@ -103,6 +105,25 @@ static struct syscore_ops leds_syscore_ops = {
.resume = leds_resume,
};
+static int leds_idle_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ switch (val) {
+ case SCHED_IDLE_START:
+ leds_event(led_idle_start);
+ break;
+ case SCHED_IDLE_END:
+ leds_event(led_idle_end);
+ break;
+ }
+
+ return 0;
+}
+
+static struct notifier_block leds_idle_nb = {
+ .notifier_call = leds_idle_notifier,
+};
+
static int __init leds_init(void)
{
int ret;
@@ -111,8 +132,10 @@ static int __init leds_init(void)
ret = device_register(&leds_device);
if (ret == 0)
ret = device_create_file(&leds_device, &dev_attr_event);
- if (ret == 0)
+ if (ret == 0) {
register_syscore_ops(&leds_syscore_ops);
+ sched_idle_notifier_register(&leds_idle_nb);
+ }
return ret;
}
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index f2bac2d..f4b53aa 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -33,7 +33,6 @@
#include <linux/cpuidle.h>
#include <asm/cacheflush.h>
-#include <asm/leds.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/thread_notify.h>
@@ -207,7 +206,6 @@ void cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
sched_idle_enter();
- leds_event(led_idle_start);
while (!need_resched()) {
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(smp_processor_id()))
@@ -235,7 +233,6 @@ void cpu_idle(void)
local_irq_enable();
}
}
- leds_event(led_idle_end);
sched_idle_exit();
preempt_enable_no_resched();
schedule();
--
1.7.7.6
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