linux-kernel - New warning: ACPI: CEDT not present

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Message-ID: <55f5c077-061c-7e53-b02d-53dde1dd654f@molgen.mpg.de>
Date:   Tue, 15 Feb 2022 08:51:44 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-acpi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        regressions@...ts.linux.dev
Subject: New warning: ACPI: CEDT not present

#regzbot introduced: 2d03e46a4bad20191d07b83ec1242d5f002577be

Dear Dan,

On the Dell Latitude E7250, Linux 5.17-rc3 logs the warning below 
(`dmesg --level=warn`):

     ACPI: CEDT not present

I think commit 2d03e46a4bad (ACPI: Add a context argument for table 
parsing handlers), part of Linux since 5.17-rc1, is the reason.

If I understand it correctly, CEDT is not to be expected on older 
devices, so the warning is not justified. Can something be done about it?

Kind regards,

Paul