linux-kernel - Re: [PATCH] ACPI: processor: Move MWAIT quirk out of acpi

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Date:   Tue, 29 Aug 2023 07:44:49 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Michal Wilczynski <michal.wilczynski@...el.com>,
        artem.bityutskiy@...ux.intel.com, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, lenb@...nel.org,
        jgross@...e.com, linux-kernel@...r.kernel.org, x86@...nel.org,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH] ACPI: processor: Move MWAIT quirk out of acpi_processor.c

On 8/29/23 07:02, Andy Shevchenko wrote:
> On Tue, Aug 29, 2023 at 03:54:18PM +0200, Rafael J. Wysocki wrote:
>> On Tue, Aug 29, 2023 at 3:44 PM Guenter Roeck <linux@...ck-us.net> wrote:
>>> On Mon, Jul 10, 2023 at 05:03:29PM +0300, Michal Wilczynski wrote:
>>>> Commit 2a2a64714d9c ("ACPI: Disable MWAIT via DMI on broken Compal board")
>>>> introduced a workaround for MWAIT for a specific x86 system.
>>>>
>>>> Move the code outside of acpi_processor.c to acpi/x86/ directory for
>>>> consistency and rename the functions associated with it, so their names
>>>> start with "acpi_proc_quirk_" to make the goal obvious.
>>>>
>>>> No intentional functional impact.
>>>
>>> Except for:
>>>
>>> ia64-linux-ld: drivers/acpi/acpi_processor.o: in function `acpi_early_processor_control_setup':
>>> acpi_processor.c:(.init.text+0x712): undefined reference to `acpi_proc_quirk_mwait_check'
>>> ia64-linux-ld: drivers/acpi/processor_pdc.o: in function `acpi_early_processor_set_pdc':
>>> processor_pdc.c:(.init.text+0x72): undefined reference to `acpi_proc_quirk_mwait_check'
>>>
>>> which breaks all ia64 builds.
>>>
>>> Time to retire that architecture yet ? No one but me seems to even
>>> build test it.
>>
>> Including 0-day it seems.  This had been in linux-next for several weeks.
> 
> IIRC someone explicitly asked to shut down 0-day on ia64. Maybe I'm mistaken?
> I would suggest to ask internally Dave Hansen et al for this.
> 

Actually, that is correct. Build testing it was removed from 0-day on request
from Ard Biesheuvel in preparation of its removal from the Linux kernel.

I'll stop build testing it as well.

Thanks,
Guenter