From: Todd Poynor toddpoynor@google.com
Signed-off-by: Todd Poynor toddpoynor@google.com Signed-off-by: Anton Vorontsov anton.vorontsov@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();