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https://github.com/torvalds/linux
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46859ac8af
LoongArch-based procesors have 4, 8 or 16 cores per package. This patch adds multi-processor (SMP) support for LoongArch. Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
53 lines
1,005 B
C
53 lines
1,005 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/cpu.h>
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#include <linux/cpumask.h>
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#include <linux/init.h>
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#include <linux/node.h>
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#include <linux/nodemask.h>
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#include <linux/percpu.h>
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static DEFINE_PER_CPU(struct cpu, cpu_devices);
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#ifdef CONFIG_HOTPLUG_CPU
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int arch_register_cpu(int cpu)
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{
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int ret;
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struct cpu *c = &per_cpu(cpu_devices, cpu);
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c->hotpluggable = 1;
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ret = register_cpu(c, cpu);
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if (ret < 0)
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pr_warn("register_cpu %d failed (%d)\n", cpu, ret);
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return ret;
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}
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EXPORT_SYMBOL(arch_register_cpu);
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void arch_unregister_cpu(int cpu)
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{
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struct cpu *c = &per_cpu(cpu_devices, cpu);
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c->hotpluggable = 0;
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unregister_cpu(c);
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}
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EXPORT_SYMBOL(arch_unregister_cpu);
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#endif
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static int __init topology_init(void)
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{
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int i, ret;
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for_each_present_cpu(i) {
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struct cpu *c = &per_cpu(cpu_devices, i);
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c->hotpluggable = !!i;
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ret = register_cpu(c, i);
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if (ret < 0)
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pr_warn("topology_init: register_cpu %d failed (%d)\n", i, ret);
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}
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return 0;
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}
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subsys_initcall(topology_init);
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