1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/acpi.h> 3 #include <linux/cpu.h> 4 #include <linux/cpumask.h> 5 #include <linux/init.h> 6 #include <linux/node.h> 7 #include <linux/nodemask.h> 8 #include <linux/percpu.h> 9 #include <asm/bootinfo.h> 10 11 #include <acpi/processor.h> 12 13 static DEFINE_PER_CPU(struct cpu, cpu_devices); 14 15 #ifdef CONFIG_HOTPLUG_CPU 16 int arch_register_cpu(int cpu) 17 { 18 int ret; 19 struct cpu *c = &per_cpu(cpu_devices, cpu); 20 21 c->hotpluggable = 1; 22 ret = register_cpu(c, cpu); 23 if (ret < 0) 24 pr_warn("register_cpu %d failed (%d)\n", cpu, ret); 25 26 return ret; 27 } 28 EXPORT_SYMBOL(arch_register_cpu); 29 30 void arch_unregister_cpu(int cpu) 31 { 32 struct cpu *c = &per_cpu(cpu_devices, cpu); 33 34 c->hotpluggable = 0; 35 unregister_cpu(c); 36 } 37 EXPORT_SYMBOL(arch_unregister_cpu); 38 #endif 39 40 static int __init topology_init(void) 41 { 42 int i, ret; 43 44 for_each_present_cpu(i) { 45 struct cpu *c = &per_cpu(cpu_devices, i); 46 47 c->hotpluggable = !io_master(i); 48 ret = register_cpu(c, i); 49 if (ret < 0) 50 pr_warn("topology_init: register_cpu %d failed (%d)\n", i, ret); 51 } 52 53 return 0; 54 } 55 56 subsys_initcall(topology_init); 57