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Message-ID: <5511C73D.5020006@dell.com>
Date: Tue, 24 Mar 2015 15:21:17 -0500
From: Mario Limonciello <mario_limonciello@dell.com>
Organization: Dell Inc.
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To: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Matt Fleming <matt@codeblueprint.co.uk>
CC: Jason Ekstrand <jason@jlekstrand.net>, LKML <linux-kernel@vger.kernel.org>,
        Matthew Garrett <mjg59@srcf.ucam.org>,
        Bard Liao <bardliao@realtek.com>,
        Liam Girdwood <liam.r.girdwood@linux.intel.com>,
        "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
        "lenb@kernel.org" <lenb@kernel.org>
Subject: Re: [PATCH] ACPI: Adjust the return value of _REV on x86
References: <1426150247-18309-1-git-send-email-matthew.garrett@nebula.com> <5510FB37.6030808@dell.com> <20150324152412.GA4706@codeblueprint.co.uk> <3241492.O6brgYIrX9@vostro.rjw.lan>
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On 03/24/2015 03:02 PM, Rafael J. Wysocki wrote:
> On Tuesday, March 24, 2015 03:24:12 PM Matt Fleming wrote:
> While I agree in general, one comment.
>
> We haven't decided about the patch yet.  We may decide to bump up the _REV
> to 6 when ACPI 6 is out instead.
I'd be happy with this too.
> That said the whole using of _REV to special case Linux is broken by design
> and should be stopped immediately.  Especially when it is done by comparing
> the return value of _REV to a specific number (like 5 or 3).
>
> Rafael
>
Yes, it's been made clear to me that this shouldn't be used in the future.  I've shared that feedback to my BIOS architecture team.