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e59e74dc48
This was introduced together with commit e1c467e690 ("x86, hotplug: Wake
up CPU0 via NMI instead of INIT, SIPI, SIPI") to eventually support
physical hotplug of CPU0:
"We'll change this code in the future to wake up hard offlined CPU0 if
real platform and request are available."
11 years later this has not happened and physical hotplug is not officially
supported. Remove the cruft.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Tested-by: Helge Deller <deller@gmx.de> # parisc
Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> # Steam Deck
Link: https://lore.kernel.org/r/20230512205255.715707999@linutronix.de
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
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* Populate sysfs with topology information
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*
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* Written by: Matthew Dobson, IBM Corporation
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* Original Code: Paul Dorwin, IBM Corporation, Patrick Mochel, OSDL
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*
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* Copyright (C) 2002, IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <colpatch@us.ibm.com>
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*/
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#include <linux/interrupt.h>
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#include <linux/nodemask.h>
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#include <linux/export.h>
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#include <linux/mmzone.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/irq.h>
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#include <asm/io_apic.h>
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#include <asm/cpu.h>
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static DEFINE_PER_CPU(struct x86_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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struct x86_cpu *xc = per_cpu_ptr(&cpu_devices, cpu);
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xc->cpu.hotpluggable = cpu > 0;
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return register_cpu(&xc->cpu, cpu);
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}
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EXPORT_SYMBOL(arch_register_cpu);
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void arch_unregister_cpu(int num)
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{
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unregister_cpu(&per_cpu(cpu_devices, num).cpu);
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}
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EXPORT_SYMBOL(arch_unregister_cpu);
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#else /* CONFIG_HOTPLUG_CPU */
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static int __init arch_register_cpu(int num)
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{
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return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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static int __init topology_init(void)
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{
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int i;
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for_each_present_cpu(i)
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arch_register_cpu(i);
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return 0;
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}
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subsys_initcall(topology_init);
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