Now the cpuidle_idle_call does nothing more than calling the three individuals
function, we can move this function into the idle task code to ensure better
proximity to the scheduler code.
Signed-off-by: Daniel Lezcano <daniel.lezc...@linaro.org>
---
drivers/cpuidle/cpuidle.c | 37 -------------------------------------
include/linux/cpuidle.h | 2 --
kernel/sched/idle.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 44 insertions(+), 39 deletions(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index a8fbb28..a039344 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -176,43 +176,6 @@ void cpuidle_reflect(struct cpuidle_device *dev, int index)
EXPORT_SYMBOL(cpuidle_reflect);
/**
- * 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;
-
- /* ask the governor for the next state */
- next_state = cpuidle_select(drv, dev);
- if (next_state < 0)
- return next_state;
-
- 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;
- }
-
- 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);
-
- /* 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
*/
void cpuidle_install_idle_handler(void)
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 1ebe9ff..74cdfc9 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -126,7 +126,6 @@ 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);
@@ -148,7 +147,6 @@ extern int cpuidle_play_dead(void);
extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device
*dev);
#else
static inline void disable_cpuidle(void) { }
-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 65d0427..3e85d38 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -62,6 +62,50 @@ 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;
+
+ /* ask the governor for the next state */
+ next_state = cpuidle_select(drv, dev);
+ if (next_state < 0)
+ return next_state;
+
+ 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;
+ }
+
+ 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);
+
+ /* 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
*/
--
1.7.9.5
--
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