From 30cdd69e2a266505ca8229c944d361ff350a6959 Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Mon, 3 Mar 2014 08:48:51 +0100 Subject: [PATCH] cpuidle/idle: Move the cpuidle_idle_call function to idle.c The cpuidle_idle_call does nothing more than calling the three individuals function and is no longer used by any arch specific code but only in the cpuidle framework code. We can move this function into the idle task code to ensure better proximity to the scheduler code. Signed-off-by: Daniel Lezcano Acked-by: Nicolas Pitre Signed-off-by: Peter Zijlstra Cc: rjw@rjwysocki.net Cc: preeti@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1393832934-11625-2-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar --- drivers/cpuidle/cpuidle.c | 49 ---------------------------------- include/linux/cpuidle.h | 2 -- kernel/sched/idle.c | 56 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 56 insertions(+), 51 deletions(-) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 1506d69b3f0f..166a7322a2b6 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -172,55 +172,6 @@ void cpuidle_reflect(struct cpuidle_device *dev, int index) cpuidle_curr_governor->reflect(dev, index); } -/** - * cpuidle_idle_call - the main idle loop - * - * NOTE: no locks or semaphores should be used here - * return non-zero on failure - */ -int cpuidle_idle_call(void) -{ - struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); - struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); - int next_state, entered_state, ret; - bool broadcast; - - ret = cpuidle_enabled(drv, dev); - if (ret < 0) - return ret; - - /* ask the governor for the next state */ - next_state = cpuidle_select(drv, dev); - - if (need_resched()) { - dev->last_residency = 0; - /* give the governor an opportunity to reflect on the outcome */ - cpuidle_reflect(dev, next_state); - local_irq_enable(); - return 0; - } - - broadcast = !!(drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP); - - if (broadcast && - clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu)) - return -EBUSY; - - trace_cpu_idle_rcuidle(next_state, dev->cpu); - - entered_state = cpuidle_enter(drv, dev, next_state); - - trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu); - - if (broadcast) - clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu); - - /* give the governor an opportunity to reflect on the outcome */ - cpuidle_reflect(dev, entered_state); - - return 0; -} - /** * cpuidle_install_idle_handler - installs the cpuidle idle loop handler */ diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index accc2dd72049..8d97962d6d64 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -128,7 +128,6 @@ extern int cpuidle_enter(struct cpuidle_driver *drv, struct cpuidle_device *dev, int index); extern void cpuidle_reflect(struct cpuidle_device *dev, int index); -extern int cpuidle_idle_call(void); extern int cpuidle_register_driver(struct cpuidle_driver *drv); extern struct cpuidle_driver *cpuidle_get_driver(void); extern struct cpuidle_driver *cpuidle_driver_ref(void); @@ -160,7 +159,6 @@ static inline int cpuidle_enter(struct cpuidle_driver *drv, struct cpuidle_device *dev, int index) {return -ENODEV; } static inline void cpuidle_reflect(struct cpuidle_device *dev, int index) { } -static inline int cpuidle_idle_call(void) { return -ENODEV; } static inline int cpuidle_register_driver(struct cpuidle_driver *drv) {return -ENODEV; } static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; } diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index b7976a127178..d5aaf5eb4531 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -63,6 +63,62 @@ void __weak arch_cpu_idle(void) local_irq_enable(); } +#ifdef CONFIG_CPU_IDLE +/** + * cpuidle_idle_call - the main idle function + * + * NOTE: no locks or semaphores should be used here + * return non-zero on failure + */ +static int cpuidle_idle_call(void) +{ + struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); + struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); + int next_state, entered_state, ret; + bool broadcast; + + ret = cpuidle_enabled(drv, dev); + if (ret < 0) + return ret; + + /* ask the governor for the next state */ + next_state = cpuidle_select(drv, dev); + + if (need_resched()) { + dev->last_residency = 0; + /* give the governor an opportunity to reflect on the outcome */ + cpuidle_reflect(dev, next_state); + local_irq_enable(); + return 0; + } + + broadcast = !!(drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP); + + if (broadcast && + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu)) + return -EBUSY; + + trace_cpu_idle_rcuidle(next_state, dev->cpu); + + entered_state = cpuidle_enter(drv, dev, next_state); + + trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu); + + if (broadcast) + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu); + + /* give the governor an opportunity to reflect on the outcome */ + cpuidle_reflect(dev, entered_state); + + return 0; +} +#else +static inline int cpuidle_idle_call(void) +{ + return -ENODEV; +} +#endif + /* * Generic idle loop implementation */ -- 2.30.2