| From | "Rafael J. Wysocki" <> | Date | Mon, 18 Dec 2023 21:35:16 +0100 | Subject | Re: [PATCH RFC v3 05/21] ACPI: Rename ACPI_HOTPLUG_CPU to include 'present' |
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On Wed, Dec 13, 2023 at 1:49 PM Russell King <rmk+kernel@armlinux.org.uk> wrote: > > From: James Morse <james.morse@arm.com> > > The code behind ACPI_HOTPLUG_CPU allows a not-present CPU to become > present.
Right.
> This isn't the only use of HOTPLUG_CPU. On arm64 and riscv > CPUs can be taken offline as a power saving measure.
But still there is the case in which a non-present CPU can become present, isn't it there?
> On arm64 an offline CPU may be disabled by firmware, preventing it from > being brought back online, but it remains present throughout. > > Adding code to prevent user-space trying to online these disabled CPUs > needs some additional terminology. > > Rename the Kconfig symbol CONFIG_ACPI_HOTPLUG_PRESENT_CPU to reflect > that it makes possible CPUs present.
Honestly, I don't think that this change is necessary or even useful.
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