arch/loongarch/kernel/topology.c

   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
   9 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  10
  11 #ifdef CONFIG_HOTPLUG_CPU
  12 int arch_register_cpu(int cpu)
  13 {
  14         int ret;
  15         struct cpu *c = &per_cpu(cpu_devices, cpu);
  16
  17         c->hotpluggable = 1;
  18         ret = register_cpu(c, cpu);
  19         if (ret < 0)
  20                 pr_warn("register_cpu %d failed (%d)\n", cpu, ret);
  21
  22         return ret;
  23 }
  24 EXPORT_SYMBOL(arch_register_cpu);
  25
  26 void arch_unregister_cpu(int cpu)
  27 {
  28         struct cpu *c = &per_cpu(cpu_devices, cpu);
  29
  30         c->hotpluggable = 0;
  31         unregister_cpu(c);
  32 }
  33 EXPORT_SYMBOL(arch_unregister_cpu);
  34 #endif
  35
  36 static int __init topology_init(void)
  37 {
  38         int i, ret;
  39
  40         for_each_present_cpu(i) {
  41                 struct cpu *c = &per_cpu(cpu_devices, i);
  42
  43                 c->hotpluggable = !!i;
  44                 ret = register_cpu(c, i);
  45                 if (ret < 0)
  46                         pr_warn("topology_init: register_cpu %d failed (%d)\n", i, ret);
  47         }
  48
  49         return 0;
  50 }
  51
  52 subsys_initcall(topology_init);