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arm64: Use generic idle loop

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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: http://lkml.kernel.org/r/20130321215233.887563095@linutronix.de
This commit is contained in:
Thomas Gleixner 2013-03-21 22:49:39 +01:00
parent f7b861b7a6
commit 0087298f68
3 changed files with 7 additions and 39 deletions
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1
arch/arm64/Kconfig
View File

@ -9,6 +9,7 @@ config ARM64
select CLONE_BACKWARDS
select COMMON_CLK
select GENERIC_CLOCKEVENTS
select GENERIC_IDLE_LOOP
select GENERIC_IOMAP
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW

43
arch/arm64/kernel/process.c
View File

@ -84,11 +84,15 @@ EXPORT_SYMBOL_GPL(pm_power_off);
void (*pm_restart)(const char *cmd);
EXPORT_SYMBOL_GPL(pm_restart);
void arch_cpu_idle_prepare(void)
{
local_fiq_enable();
}
/*
* This is our default idle handler.
*/
static void default_idle(void)
void arch_cpu_idle(void)
{
/*
* This should do all the clock switching and wait for interrupt
@ -98,43 +102,6 @@ static void default_idle(void)
local_irq_enable();
}
/*
* The idle thread.
* We always respect 'hlt_counter' to prevent low power idle.
*/
void cpu_idle(void)
{
local_fiq_enable();
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched()) {
/*
* We need to disable interrupts here to ensure
* we don't miss a wakeup call.
*/
local_irq_disable();
if (!need_resched()) {
stop_critical_timings();
default_idle();
start_critical_timings();
/*
* default_idle functions should always return
* with IRQs enabled.
*/
WARN_ON(irqs_disabled());
} else {
local_irq_enable();
}
}
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
}
void machine_shutdown(void)
{
#ifdef CONFIG_SMP

2
arch/arm64/kernel/smp.c
View File

@ -216,7 +216,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
/*
* OK, it's off to the idle thread for us
*/
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_cpus_done(unsigned int max_cpus)