| Date | Thu, 14 Sep 2023 10:56:10 +0100 | From | "Russell King (Oracle)" <> | Subject | Re: [RFC PATCH v2 06/35] arm64: setup: Switch over to GENERIC_CPU_DEVICES using arch_register_cpu() |
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On Wed, Sep 13, 2023 at 04:37:54PM +0000, James Morse wrote: > To allow ACPI's _STA value to hide CPUs that are present, but not > available to online right now due to VMM or firmware policy, the > register_cpu() call needs to be made by the ACPI machinery when ACPI > is in use. This allows it to hide CPUs that are unavailable from sysfs. > > Switching to GENERIC_CPU_DEVICES is an intermediate step to allow all > five ACPI architectures to be modified at once. > > Switch over to GENERIC_CPU_DEVICES, and provide an arch_register_cpu() > that populates the hotpluggable flag. arch_register_cpu() is also the > interface the ACPI machinery expects. > > The struct cpu in struct cpuinfo_arm64 is never used directly, remove > it to use the one GENERIC_CPU_DEVICES provides. > > This changes the CPUs visible in sysfs from possible to present, but > on arm64 smp_prepare_cpus() ensures these are the same. > > Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
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