linux-kernel - Re: New warning: PRMT not found

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Message-ID: <c6aaf684-2cd1-f615-34e1-7ef2020ae2d2@molgen.mpg.de>
Date:   Mon, 6 Sep 2021 16:15:14 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Aubrey Li <aubrey.li@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: New warning: PRMT not found

Dear Rafael, dear Aubrey,


Thank you for replying.


Am 06.09.21 um 14:02 schrieb Rafael J. Wysocki:
> On Mon, Sep 6, 2021 at 1:51 PM Paul Menzel <pmenzel@...gen.mpg.de> wrote:

[…]

>> Am 26.07.21 um 09:42 schrieb Paul Menzel:

>>> The new code added in commit cefc7ca462 (ACPI: PRM: implement
>>> OperationRegion handler for the PlatformRtMechanism subtype) causes
>>> Linux to log a warning on my desktop system Asus F2A85-M PRO.
>>>
>>>       PRMT not found
>>>
>>> The help text for the Kconfig option `ACPI_PRMT` suggests it’s mainly
>>> used for server systems, so the warning does not apply to a lot of
>>> systems. Therefore, in my opinion, the option should not be selected by
>>> default, or the warning be removed or demoted, and phrased in a way,
>>> that users can understand the consequences.
>>
>> The new warning shows up on a lot of systems, with no indication what to
>> do about it or why Linux actually warns about it.
>>
>> Should the message be removed entirely? Or is there another indicator
>> for systems where absent PRMT causes problems, so should be warned about?
> 
> This should be addressed by commit 2bbfa0addd63 "ACPI: PRM: Deal with
> table not present or no module found", or yet another fix is needed.

Linux still warns on my systems with Linux 5.14 and Linus’ master in 
QEMU i440fx and an Asus F2A85-M PRO.


Kind regards,

Paul