2 * Populate sysfs with topology information
4 * Written by: Matthew Dobson, IBM Corporation
5 * Original Code: Paul Dorwin, IBM Corporation, Patrick Mochel, OSDL
7 * Copyright (C) 2002, IBM Corp.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 * Send feedback to <colpatch@us.ibm.com>
28 #include <linux/init.h>
29 #include <linux/smp.h>
30 #include <linux/nodemask.h>
31 #include <linux/mmzone.h>
34 static DEFINE_PER_CPU(struct x86_cpu, cpu_devices);
36 #ifdef CONFIG_HOTPLUG_CPU
37 int arch_register_cpu(int num)
40 * CPU0 cannot be offlined due to several
41 * restrictions and assumptions in kernel. This basically
42 * doesnt add a control file, one cannot attempt to offline
45 * Also certain PCI quirks require not to enable hotplug control
49 per_cpu(cpu_devices, num).cpu.hotpluggable = 1;
50 return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
52 EXPORT_SYMBOL(arch_register_cpu);
54 void arch_unregister_cpu(int num)
56 unregister_cpu(&per_cpu(cpu_devices, num).cpu);
58 EXPORT_SYMBOL(arch_unregister_cpu);
60 static int __init arch_register_cpu(int num)
62 return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
64 #endif /*CONFIG_HOTPLUG_CPU*/
66 static int __init topology_init(void)
71 for_each_online_node(i)
73 #endif /* CONFIG_NUMA */
75 for_each_present_cpu(i)
80 subsys_initcall(topology_init);