linux-kernel - Re: [PATCH RFC v4 02/15] ACPI: processor: Register all CPUs from acpi_processor_get

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Date: Tue, 20 Feb 2024 21:59:11 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Russell King
 <rmk+kernel@...linux.org.uk>
Cc: linux-pm@...r.kernel.org, loongarch@...ts.linux.dev,
 linux-acpi@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-riscv@...ts.infradead.org, kvmarm@...ts.linux.dev, x86@...nel.org,
 acpica-devel@...ts.linuxfoundation.org, linux-csky@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-ia64@...r.kernel.org,
 linux-parisc@...r.kernel.org, Salil Mehta <salil.mehta@...wei.com>,
 Jean-Philippe Brucker <jean-philippe@...aro.org>, jianyong.wu@....com,
 justin.he@....com, James Morse <james.morse@....com>, Jonathan Cameron
 <Jonathan.Cameron@...wei.com>, "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH RFC v4 02/15] ACPI: processor: Register all CPUs from
 acpi_processor_get_info()

On Thu, Feb 15 2024 at 20:22, Rafael J. Wysocki wrote:
> On Wed, Jan 31, 2024 at 5:50 PM Russell King <rmk+kernel@...linuxorg.uk> wrote:
>> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
>> index 47de0f140ba6..13d052bf13f4 100644
>> --- a/drivers/base/cpu.c
>> +++ b/drivers/base/cpu.c
>> @@ -553,7 +553,11 @@ static void __init cpu_dev_register_generic(void)
>>  {
>>         int i, ret;
>>
>> -       if (!IS_ENABLED(CONFIG_GENERIC_CPU_DEVICES))
>> +       /*
>> +        * When ACPI is enabled, CPUs are registered via
>> +        * acpi_processor_get_info().
>> +        */
>> +       if (!IS_ENABLED(CONFIG_GENERIC_CPU_DEVICES) || !acpi_disabled)
>>                 return;
>
> Honestly, this looks like a quick hack to me and it absolutely
> requires an ACK from the x86 maintainers to go anywhere.

That should work, but yes I agree it's all but pretty.