linux-kernel - Re: MTRR use in drivers

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Message-ID: <CAPM=9tyf18k+WYE7HwuJi2hefFYPyAYp6vVRvfgfprSYjapE-g@mail.gmail.com>
Date:	Mon, 24 Jun 2013 06:54:07 +1000
From:	Dave Airlie <airlied@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Brice Goglin <brice.goglin@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: MTRR use in drivers

>> breaking old boxes just because, is just going to get reverted when I
>> get the first regression report that you broke old boxes.
>>
>
> Not "just because", but *if* the choice is between breaking old boxes
> and breaking new boxes I'll take the latter.
>

But Linus won't so your choice doesn't matter.

>> Andy Lutomirski just submitted a bunch of patches to clean up the DRM
>> usage of mtrrs, they are in drm-next, afaik we no longer add them on
>> PAT systems.
>
> Fantastic news.  No issue, then, and no need to break anything.

Granted I haven't tested Andy's patches on my AGP boxes, and I intend to,
if they do cause any regressions he'll be working them out :-)

Dave.
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