[PATCH RFC v3 05/21] ACPI: Rename ACPI_HOTPLUG_CPU to include 'present'
Rafael J. Wysocki
rafael at kernel.org
Mon Dec 18 12:35:16 PST 2023
On Wed, Dec 13, 2023 at 1:49 PM Russell King <rmk+kernel at armlinux.org.uk> wrote:
>
> From: James Morse <james.morse at 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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