1. 根目录:
2. arch
3. metag
4. kernel
5. topology.c

/*
 *  Copyright (C) 2007  Paul Mundt
 *  Copyright (C) 2010  Imagination Technolohies Ltd.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/node.h>
#include <linux/nodemask.h>
#include <linux/topology.h>

#include <asm/cpu.h>

DEFINE_PER_CPU(struct cpuinfo_metag, cpu_data);

cpumask_t cpu_core_map[NR_CPUS];
EXPORT_SYMBOL(cpu_core_map);

static cpumask_t cpu_coregroup_map(unsigned int cpu)
{
	return *cpu_possible_mask;
}

const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
{
	return &cpu_core_map[cpu];
}

int arch_update_cpu_topology(void)
{
	unsigned int cpu;

	for_each_possible_cpu(cpu)
		cpu_core_map[cpu] = cpu_coregroup_map(cpu);

	return 0;
}

static int __init topology_init(void)
{
	int i, ret;

#ifdef CONFIG_NEED_MULTIPLE_NODES
	for_each_online_node(i)
		register_one_node(i);
#endif

	for_each_present_cpu(i) {
		struct cpuinfo_metag *cpuinfo = &per_cpu(cpu_data, i);
#ifdef CONFIG_HOTPLUG_CPU
		cpuinfo->cpu.hotpluggable = 1;
#endif
		ret = register_cpu(&cpuinfo->cpu, i);
		if (unlikely(ret))
			pr_warn("%s: register_cpu %d failed (%d)\n",
				__func__, i, ret);
	}

#if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
	/*
	 * In the UP case, make sure the CPU association is still
	 * registered under each node. Without this, sysfs fails
	 * to make the connection between nodes other than node0
	 * and cpu0.
	 */
	for_each_online_node(i)
		if (i != numa_node_id())
			register_cpu_under_node(raw_smp_processor_id(), i);
#endif

	return 0;
}
subsys_initcall(topology_init);