1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/*
* 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/init.h>
#include <linux/smp.h>
#include <linux/nodemask.h>
#include <linux/mmzone.h>
#include <asm/cpu.h>
static DEFINE_PER_CPU(struct x86_cpu, cpu_devices);
#ifdef CONFIG_HOTPLUG_CPU
int arch_register_cpu(int num)
{
/*
* CPU0 cannot be offlined due to several
* restrictions and assumptions in kernel. This basically
* doesnt 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)
{
return unregister_cpu(&per_cpu(cpu_devices, num).cpu);
}
EXPORT_SYMBOL(arch_unregister_cpu);
#else
int arch_register_cpu(int num)
{
return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
}
EXPORT_SYMBOL(arch_register_cpu);
#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 /* CONFIG_NUMA */
for_each_present_cpu(i)
arch_register_cpu(i);
return 0;
}
subsys_initcall(topology_init);
|
