linux-kernel - Re: [PATCH] x86-64: more fixes and cleanup to AMD Fam10 MMCONF enabling

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Date:	Mon, 08 Nov 2010 08:04:49 +0000
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Yinghai Lu" <yinghai@...nel.org>
Cc:	<mingo@...e.hu>, <tglx@...utronix.de>,
	<linux-kernel@...r.kernel.org>, <hpa@...or.com>
Subject: Re: [PATCH] x86-64: more fixes and cleanup to AMD Fam10 MMCONF
	 enabling

>>> On 05.11.10 at 18:51, Yinghai Lu <yinghai@...nel.org> wrote:
> On 11/05/2010 03:59 AM, Jan Beulich wrote:
>> Unfortunately it turned out the original code had more issues: We want
>> to place the region above 4G in any case (even if TOM2 isn't enabled
>> or invalid), and the base mask definition was improperly typed (thus
>> causing shifts by FAM10H_MMIO_CONF_BASE_SHIFT to produce other than
>> the intended result). Fixing this in turn allowed simplifying the MMIO
>> region detection code, as regions ending below TOM2 now aren't of
>> interest anymore.
>> 
>> This will only apply cleanly on top of yesterday's patch titled
>> "x86-64: fix and clean up AMD Fam10 MMCONF enabling".
> 
> I don't think we have systems that have Enable bit set, but TOM2 < 4G.

I suppose that's true, but making the kernel independent of
BIOS flaws (especially when it's that cheap) seems like a good
idea to me. But of course, if that's what would be hindering
acceptance of the patch, I'd re-submit with that part dropped.

Jan

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