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Commit 0087298f authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

arm64: Use generic idle loop 



Signed-off-by: default avatarThomas 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: default avatarCc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Link: http://lkml.kernel.org/r/20130321215233.887563095@linutronix.de
parent f7b861b7

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arm64/kernel/process.c

+5 −38
Original line number Diff line number Diff line
@@ -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

arch/arm64/kernel/smp.c

+1 −1
Original line number Diff line number Diff line
@@ -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)