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sched/idle: Reorganize the idle loop 

Now that we have the main cpuidle function in idle.c, move some code from
the idle mainloop to this function for the sake of clarity.

That removes if then else indentation difficult to follow when looking at the
code. This patch does not change the current behavior.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: tglx@linutronix.de
Cc: rjw@rjwysocki.net
Cc: preeti@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1393832934-11625-3-git-send-email-daniel.lezcano@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Daniel Lezcano 2014-03-03 08:48:52 +01:00 committed by Ingo Molnar
parent 30cdd69e2a
commit c8cc7d4de7
2 changed files with 17 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/cpuidle.h
View File

@ -180,6 +180,8 @@ static inline int cpuidle_enable_device(struct cpuidle_device *dev)
{return -ENODEV; }
static inline void cpuidle_disable_device(struct cpuidle_device *dev) { }
static inline int cpuidle_play_dead(void) {return -ENODEV; }
static inline struct cpuidle_driver *cpuidle_get_cpu_driver(
struct cpuidle_device *dev) {return NULL; }
#endif
#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED

33
kernel/sched/idle.c
View File

@ -63,7 +63,6 @@ void __weak arch_cpu_idle(void)
local_irq_enable();
}
#ifdef CONFIG_CPU_IDLE
/**
* cpuidle_idle_call - the main idle function
*
@ -77,9 +76,14 @@ static int cpuidle_idle_call(void)
int next_state, entered_state, ret;
bool broadcast;
stop_critical_timings();
rcu_idle_enter();
ret = cpuidle_enabled(drv, dev);
if (ret < 0)
return ret;
if (ret < 0) {
arch_cpu_idle();
goto out;
}
/* ask the governor for the next state */
next_state = cpuidle_select(drv, dev);
@ -89,7 +93,7 @@ static int cpuidle_idle_call(void)
/* give the governor an opportunity to reflect on the outcome */
cpuidle_reflect(dev, next_state);
local_irq_enable();
return 0;
goto out;
}
broadcast = !!(drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP);
@ -109,15 +113,15 @@ static int cpuidle_idle_call(void)
/* give the governor an opportunity to reflect on the outcome */
cpuidle_reflect(dev, entered_state);
out:
if (WARN_ON_ONCE(irqs_disabled()))
local_irq_enable();
rcu_idle_exit();
start_critical_timings();
return 0;
}
#else
static inline int cpuidle_idle_call(void)
{
return -ENODEV;
}
#endif
/*
* Generic idle loop implementation
@ -150,14 +154,7 @@ static void cpu_idle_loop(void)
cpu_idle_poll();
} else {
if (!current_clr_polling_and_test()) {
stop_critical_timings();
rcu_idle_enter();
if (cpuidle_idle_call())
arch_cpu_idle();
if (WARN_ON_ONCE(irqs_disabled()))
local_irq_enable();
rcu_idle_exit();
start_critical_timings();
cpuidle_idle_call();
} else {
local_irq_enable();
}