54 lines
1.0 KiB
C
54 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/cpu.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/init.h>
|
|
#include <linux/node.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/percpu.h>
|
|
#include <asm/bootinfo.h>
|
|
|
|
static DEFINE_PER_CPU(struct cpu, cpu_devices);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
int arch_register_cpu(int cpu)
|
|
{
|
|
int ret;
|
|
struct cpu *c = &per_cpu(cpu_devices, cpu);
|
|
|
|
c->hotpluggable = 1;
|
|
ret = register_cpu(c, cpu);
|
|
if (ret < 0)
|
|
pr_warn("register_cpu %d failed (%d)\n", cpu, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(arch_register_cpu);
|
|
|
|
void arch_unregister_cpu(int cpu)
|
|
{
|
|
struct cpu *c = &per_cpu(cpu_devices, cpu);
|
|
|
|
c->hotpluggable = 0;
|
|
unregister_cpu(c);
|
|
}
|
|
EXPORT_SYMBOL(arch_unregister_cpu);
|
|
#endif
|
|
|
|
static int __init topology_init(void)
|
|
{
|
|
int i, ret;
|
|
|
|
for_each_present_cpu(i) {
|
|
struct cpu *c = &per_cpu(cpu_devices, i);
|
|
|
|
c->hotpluggable = !io_master(i);
|
|
ret = register_cpu(c, i);
|
|
if (ret < 0)
|
|
pr_warn("topology_init: register_cpu %d failed (%d)\n", i, ret);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(topology_init);
|