1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/cpu.h>
3 #include <linux/cpumask.h>
4 #include <linux/init.h>
5 #include <linux/node.h>
6 #include <linux/nodemask.h>
7 #include <linux/percpu.h>
8 #include <asm/bootinfo.h>
9
10 static DEFINE_PER_CPU(struct cpu, cpu_devices);
11
12 #ifdef CONFIG_HOTPLUG_CPU
arch_register_cpu(int cpu)13 int arch_register_cpu(int cpu)
14 {
15 int ret;
16 struct cpu *c = &per_cpu(cpu_devices, cpu);
17
18 c->hotpluggable = 1;
19 ret = register_cpu(c, cpu);
20 if (ret < 0)
21 pr_warn("register_cpu %d failed (%d)\n", cpu, ret);
22
23 return ret;
24 }
25 EXPORT_SYMBOL(arch_register_cpu);
26
arch_unregister_cpu(int cpu)27 void arch_unregister_cpu(int cpu)
28 {
29 struct cpu *c = &per_cpu(cpu_devices, cpu);
30
31 c->hotpluggable = 0;
32 unregister_cpu(c);
33 }
34 EXPORT_SYMBOL(arch_unregister_cpu);
35 #endif
36
topology_init(void)37 static int __init topology_init(void)
38 {
39 int i, ret;
40
41 for_each_present_cpu(i) {
42 struct cpu *c = &per_cpu(cpu_devices, i);
43
44 c->hotpluggable = !io_master(i);
45 ret = register_cpu(c, i);
46 if (ret < 0)
47 pr_warn("topology_init: register_cpu %d failed (%d)\n", i, ret);
48 }
49
50 return 0;
51 }
52
53 subsys_initcall(topology_init);
54