/* * Populate sysfs with topology information * * Written by: Matthew Dobson, IBM Corporation * Original Code: Paul Dorwin, IBM Corporation, Patrick Mochel, OSDL * * Copyright (C) 2002, IBM Corp. * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Send feedback to <colpatch@us.ibm.com> */ #include <linux/nodemask.h> #include <linux/export.h> #include <linux/mmzone.h> #include <linux/init.h> #include <linux/smp.h> #include <asm/cpu.h> static DEFINE_PER_CPU(struct x86_cpu, cpu_devices); #ifdef CONFIG_HOTPLUG_CPU int __ref arch_register_cpu(int num) { /* * CPU0 cannot be offlined due to several * restrictions and assumptions in kernel. This basically * doesn't add a control file, one cannot attempt to offline * BSP. * * Also certain PCI quirks require not to enable hotplug control * for all CPU's. */ if (num) per_cpu(cpu_devices, num).cpu.hotpluggable = 1; return register_cpu(&per_cpu(cpu_devices, num).cpu, num); } EXPORT_SYMBOL(arch_register_cpu); void arch_unregister_cpu(int num) { unregister_cpu(&per_cpu(cpu_devices, num).cpu); } EXPORT_SYMBOL(arch_unregister_cpu); #else /* CONFIG_HOTPLUG_CPU */ static int __init arch_register_cpu(int num) { return register_cpu(&per_cpu(cpu_devices, num).cpu, num); } #endif /* CONFIG_HOTPLUG_CPU */ static int __init topology_init(void) { int i; #ifdef CONFIG_NUMA for_each_online_node(i) register_one_node(i); #endif for_each_present_cpu(i) arch_register_cpu(i); return 0; } subsys_initcall(topology_init);