diff options
Diffstat (limited to 'arch/arm/kernel/process.c')
| -rw-r--r-- | arch/arm/kernel/process.c | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index 409db6d5ec9..30494aab829 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -26,6 +26,7 @@ #include <linux/interrupt.h> #include <linux/kallsyms.h> #include <linux/init.h> +#include <linux/cpu.h> #include <asm/system.h> #include <asm/io.h> @@ -85,12 +86,16 @@ EXPORT_SYMBOL(pm_power_off); */ void default_idle(void) { - local_irq_disable(); - if (!need_resched() && !hlt_counter) { - timer_dyn_reprogram(); - arch_idle(); + if (hlt_counter) + cpu_relax(); + else { + local_irq_disable(); + if (!need_resched()) { + timer_dyn_reprogram(); + arch_idle(); + } + local_irq_enable(); } - local_irq_enable(); } /* @@ -105,15 +110,23 @@ void cpu_idle(void) /* endless idle loop with no priority at all */ while (1) { void (*idle)(void) = pm_idle; + +#ifdef CONFIG_HOTPLUG_CPU + if (cpu_is_offline(smp_processor_id())) { + leds_event(led_idle_start); + cpu_die(); + } +#endif + if (!idle) idle = default_idle; - preempt_disable(); leds_event(led_idle_start); while (!need_resched()) idle(); leds_event(led_idle_end); - preempt_enable(); + preempt_enable_no_resched(); schedule(); + preempt_disable(); } } @@ -346,7 +359,7 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start, struct thread_info *thread = p->thread_info; struct pt_regs *childregs; - childregs = ((struct pt_regs *)((unsigned long)thread + THREAD_START_SP)) - 1; + childregs = (void *)thread + THREAD_START_SP - sizeof(*regs); *childregs = *regs; childregs->ARM_r0 = 0; childregs->ARM_sp = stack_start; |