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cpuidle: Combine cpuidle_enabled() with cpuidle_select()

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Since both cpuidle_enabled() and cpuidle_select() are only called by
cpuidle_idle_call(), it is not really useful to keep them separate
and combining them will help to avoid complicating cpuidle_idle_call()
even further if governors are changed to return error codes sometimes.

This code modification shouldn't lead to any functional changes.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2014-05-01 00:13:47 +02:00
parent d1db0eea85
commit 52c324f8a8
3 changed files with 13 additions and 38 deletions
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26
drivers/cpuidle/cpuidle.c
View File

@ -64,26 +64,6 @@ int cpuidle_play_dead(void)
return -ENODEV;
}
/**
* cpuidle_enabled - check if the cpuidle framework is ready
* @dev: cpuidle device for this cpu
* @drv: cpuidle driver for this cpu
*
* Return 0 on success, otherwise:
* -NODEV : the cpuidle framework is not available
* -EBUSY : the cpuidle framework is not initialized
*/
int cpuidle_enabled(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
if (off || !initialized)
return -ENODEV;
if (!drv || !dev || !dev->enabled)
return -EBUSY;
return 0;
}
/**
* cpuidle_enter_state - enter the state and update stats
* @dev: cpuidle device for this cpu
@ -138,6 +118,12 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
*/
int cpuidle_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
if (off || !initialized)
return -ENODEV;
if (!drv || !dev || !dev->enabled)
return -EBUSY;
return cpuidle_curr_governor->select(drv, dev);
}

5
include/linux/cpuidle.h
View File

@ -120,8 +120,6 @@ struct cpuidle_driver {
#ifdef CONFIG_CPU_IDLE
extern void disable_cpuidle(void);
extern int cpuidle_enabled(struct cpuidle_driver *drv,
struct cpuidle_device *dev);
extern int cpuidle_select(struct cpuidle_driver *drv,
struct cpuidle_device *dev);
extern int cpuidle_enter(struct cpuidle_driver *drv,
@ -149,9 +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_enabled(struct cpuidle_driver *drv,
struct cpuidle_device *dev)
{return -ENODEV; }
static inline int cpuidle_select(struct cpuidle_driver *drv,
struct cpuidle_device *dev)
{return -ENODEV; }

18
kernel/sched/idle.c
View File

@ -101,19 +101,13 @@ static int cpuidle_idle_call(void)
rcu_idle_enter();
/*
* Check if the cpuidle framework is ready, otherwise fallback
* to the default arch specific idle method
*/
ret = cpuidle_enabled(drv, dev);
if (!ret) {
/*
* Ask the governor to choose an idle state it thinks
* it is convenient to go to. There is *always* a
* convenient idle state
* Ask the cpuidle framework to choose a convenient idle state.
* Fall back to the default arch specific idle method on errors.
*/
next_state = cpuidle_select(drv, dev);
ret = next_state;
if (ret >= 0) {
/*
* The idle task must be scheduled, it is pointless to
* go to idle, just update no idle residency and get
@ -140,7 +134,7 @@ static int cpuidle_idle_call(void)
CLOCK_EVT_NOTIFY_BROADCAST_ENTER,
&dev->cpu);
if (!ret) {
if (ret >= 0) {
trace_cpu_idle_rcuidle(next_state, dev->cpu);
/*
@ -175,7 +169,7 @@ static int cpuidle_idle_call(void)
* We can't use the cpuidle framework, let's use the default
* idle routine
*/
if (ret)
if (ret < 0)
arch_cpu_idle();
__current_set_polling();