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/interrupt.h>
29 #include <linux/nodemask.h>
30 #include <linux/export.h>
31 #include <linux/mmzone.h>
32 #include <linux/init.h>
33 #include <linux/smp.h>
34 #include <linux/irq.h>
35 #include <asm/io_apic.h>
38 static DEFINE_PER_CPU(struct x86_cpu, cpu_devices);
40 #ifdef CONFIG_HOTPLUG_CPU
41 int arch_register_cpu(int cpu)
43 struct x86_cpu *xc = per_cpu_ptr(&cpu_devices, cpu);
45 xc->cpu.hotpluggable = cpu > 0;
46 return register_cpu(&xc->cpu, cpu);
48 EXPORT_SYMBOL(arch_register_cpu);
50 void arch_unregister_cpu(int num)
52 unregister_cpu(&per_cpu(cpu_devices, num).cpu);
54 EXPORT_SYMBOL(arch_unregister_cpu);
55 #else /* CONFIG_HOTPLUG_CPU */
57 int __init arch_register_cpu(int num)
59 return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
61 #endif /* CONFIG_HOTPLUG_CPU */
63 static int __init topology_init(void)
67 for_each_present_cpu(i)
72 subsys_initcall(topology_init);