/* * drivers/power/smp.c - Functions for stopping other CPUs. * * Copyright 2004 Pavel Machek <pavel@suse.cz> * Copyright (C) 2002-2003 Nigel Cunningham <ncunningham@clear.net.nz> * * This file is released under the GPLv2. */ #undef DEBUG #include <linux/smp_lock.h>#include <linux/interrupt.h>#include <linux/suspend.h>#include <linux/module.h>#include <linux/cpu.h>#include <asm/atomic.h>#include <asm/tlbflush.h> /* This is protected by pm_sem semaphore */static cpumask_t frozen_cpus; void disable_nonboot_cpus(void){	int cpu, error; 	error = 0;	cpus_clear(frozen_cpus);	printk("Freezing cpus ...\n");	for_each_online_cpu(cpu) {		if (cpu == 0)			continue;		error = cpu_down(cpu);		if (!error) {			cpu_set(cpu, frozen_cpus);			printk("CPU%d is down\n", cpu);			continue;		}		printk("Error taking cpu %d down: %d\n", cpu, error);	}	BUG_ON(raw_smp_processor_id() != 0);	if (error)		panic("cpus not sleeping");} void enable_nonboot_cpus(void){	int cpu, error; 	printk("Thawing cpus ...\n");	for_each_cpu_mask(cpu, frozen_cpus) {		error = cpu_up(cpu);		if (!error) {			printk("CPU%d is up\n", cpu);			continue;		}		printk("Error taking cpu %d up: %d\n", cpu, error);		panic("Not enough cpus");	}	cpus_clear(frozen_cpus);}