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 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 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 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