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sched/idle: Reorganize the idle loop

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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
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33
kernel/sched/idle.c
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@@ -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();
}