2 * Copyright (C) 2007 Paul Mundt
3 * Copyright (C) 2010 Imagination Technolohies Ltd.
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
10 #include <linux/cpumask.h>
11 #include <linux/init.h>
12 #include <linux/percpu.h>
13 #include <linux/node.h>
14 #include <linux/nodemask.h>
15 #include <linux/topology.h>
19 DEFINE_PER_CPU(struct cpuinfo_metag, cpu_data);
21 cpumask_t cpu_core_map[NR_CPUS];
22 EXPORT_SYMBOL(cpu_core_map);
24 static cpumask_t cpu_coregroup_map(unsigned int cpu)
26 return *cpu_possible_mask;
29 const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
31 return &cpu_core_map[cpu];
34 int arch_update_cpu_topology(void)
38 for_each_possible_cpu(cpu)
39 cpu_core_map[cpu] = cpu_coregroup_map(cpu);
44 static int __init topology_init(void)
48 #ifdef CONFIG_NEED_MULTIPLE_NODES
49 for_each_online_node(i)
53 for_each_present_cpu(i) {
54 struct cpuinfo_metag *cpuinfo = &per_cpu(cpu_data, i);
55 #ifdef CONFIG_HOTPLUG_CPU
56 cpuinfo->cpu.hotpluggable = 1;
58 ret = register_cpu(&cpuinfo->cpu, i);
60 pr_warn("%s: register_cpu %d failed (%d)\n",
64 #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
66 * In the UP case, make sure the CPU association is still
67 * registered under each node. Without this, sysfs fails
68 * to make the connection between nodes other than node0
71 for_each_online_node(i)
72 if (i != numa_node_id())
73 register_cpu_under_node(raw_smp_processor_id(), i);
78 subsys_initcall(topology_init);