#include <linux/cpu.h>
  #include <linux/cpumask.h>
  #include <linux/init.h>
  #include <linux/node.h>
  #include <linux/nodemask.h>
  #include <linux/percpu.h>
  
  static DEFINE_PER_CPU(struct cpu, cpu_devices);
  
  static int __init topology_init(void)
  {
  	int i, ret;
  
  #ifdef CONFIG_NUMA
  	for_each_online_node(i)
  		register_one_node(i);
  #endif /* CONFIG_NUMA */
  
  	for_each_present_cpu(i) {

  		struct cpu *c = &per_cpu(cpu_devices, i);
  
  		c->hotpluggable = 1;
  		ret = register_cpu(c, i);

  		if (ret)
  			printk(KERN_WARNING "topology_init: register_cpu %d "
  			       "failed (%d)
  ", i, ret);
  	}
  
  	return 0;
  }
  
  subsys_initcall(topology_init);