linux-kernel - Re: [PATCH 3/3] ghes_edac: add platform check to enable ghes

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Message-ID: <20170724164400.GB18184@nazgul.tnic>
Date:   Mon, 24 Jul 2017 18:44:00 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc:     "Kani, Toshimitsu" <toshi.kani@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "srinivas.pandruvada@...ux.intel.com" 
        <srinivas.pandruvada@...ux.intel.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
Subject: Re: [PATCH 3/3] ghes_edac: add platform check to enable ghes_edac

On Mon, Jul 24, 2017 at 01:04:13PM -0300, Mauro Carvalho Chehab wrote:
> If the Kernel force those users to use ghes_edac by default,
> they they won't see the error counts anymore, but, instead,
> hardware reports that the memories need to be replaced.

This is exactly why I'm trying to load ghes_edac only on those platforms
which would really want it.

> So, the right solution would be to keep hardware first, but
> providing a modprobe parameter to let them switch to software
> first.

That's exactly the issue: if we make it spec-conform and adhere to FF
setting, then it'll be clean. BUT(!), we will force ghes_edac on those
platforms which potentially are using the platform-specific drivers
until now. Not good.

If we do the whitelisting, then we're stuck with maintaining a yucky
whitelist and have to keep updating ghes_edac with it.

So we're basically between a rock and a hard place.

If I had to choose *right* *now*, I'd probably lean slightly towards the
whitelist as it won't break existing users.

A big grumpfy-grumbly hmmm. :-\

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--