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arm: Use generic idle loop

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Use the generic idle loop and replace enable/disable_hlt with the
respective core functions.

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>
Cc: Russell King <linux@arm.linux.org.uk>
Tested-by: Kevin Hilman <khilman@linaro.org> # OMAP
Link: http://lkml.kernel.org/r/20130321215233.826238797@linutronix.de
This commit is contained in:
Thomas Gleixner
2013-03-21 22:49:38 +01:00
parent a123322d8a
commit f7b861b7a6
15 changed files with 58 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files

98
arch/arm/kernel/process.c
View File

@@ -57,34 +57,6 @@ static const char *isa_modes[] = {
"ARM" , "Thumb" , "Jazelle", "ThumbEE"
};
static volatile int hlt_counter;
void disable_hlt(void)
{
hlt_counter++;
}
void enable_hlt(void)
{
hlt_counter--;
BUG_ON(hlt_counter < 0);
}
static int __init nohlt_setup(char *__unused)
{
hlt_counter = 1;
return 1;
}
static int __init hlt_setup(char *__unused)
{
hlt_counter = 0;
return 1;
}
__setup("nohlt", nohlt_setup);
__setup("hlt", hlt_setup);
extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
typedef void (*phys_reset_t)(unsigned long);
@@ -168,54 +140,38 @@ 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)
void arch_cpu_idle_prepare(void)
{
local_fiq_enable();
}
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
ledtrig_cpu(CPU_LED_IDLE_START);
while (!need_resched()) {
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(smp_processor_id()))
cpu_die();
#endif
/*
* We need to disable interrupts here
* to ensure we don't miss a wakeup call.
*/
local_irq_disable();
void arch_cpu_idle_enter(void)
{
ledtrig_cpu(CPU_LED_IDLE_START);
#ifdef CONFIG_PL310_ERRATA_769419
wmb();
wmb();
#endif
if (hlt_counter) {
local_irq_enable();
cpu_relax();
} else if (!need_resched()) {
stop_critical_timings();
if (cpuidle_idle_call())
default_idle();
start_critical_timings();
/*
* default_idle functions must always
* return with IRQs enabled.
*/
WARN_ON(irqs_disabled());
} else
local_irq_enable();
}
ledtrig_cpu(CPU_LED_IDLE_END);
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
}
void arch_cpu_idle_exit(void)
{
ledtrig_cpu(CPU_LED_IDLE_END);
}
#ifdef CONFIG_HOTPLUG_CPU
void arch_cpu_idle_dead(void)
{
cpu_die();
}
#endif
/*
* Called from the core idle loop.
*/
void arch_cpu_idle(void)
{
if (cpuidle_idle_call())
default_idle();
}
static char reboot_mode = 'h';

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

@@ -336,7 +336,7 @@ 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)