linux-kernel - Re: [discuss] [patch] mtrr: fix issues with large addresses

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Message-ID: <20070206162542.GJ8665@alberich.amd.com>
Date:	Tue, 6 Feb 2007 17:25:42 +0100
From:	"Andreas Herrmann" <andreas.herrmann3@....com>
To:	"Andi Kleen" <ak@...e.de>
cc:	"Jan Beulich" <jbeulich@...ell.com>,
	"Suresh B Siddha" <suresh.b.siddha@...el.com>,
	"Richard Gooch" <rgooch@...e-mbox.com>,
	linux-kernel@...r.kernel.org, discuss@...-64.org
Subject: Re: [discuss] [patch] mtrr: fix issues with large addresses

On Tue, Feb 06, 2007 at 11:54:57AM +0100, Andi Kleen wrote:
> On Tuesday 06 February 2007 10:53, Jan Beulich wrote:
> > >> I don't think I remember a restriction here, at least not below 44 bits
> > >> (that's where pfn-s would need to become 64-bit wide).
> > >
> > >The i386 mm code only supports 4 entries in the PGD, so more than 36bit cannot 
> > >be mapped right now.
> > 
> > That has nothing to do with the number of physical address bits.
> 
> You couldn't use the memory in any ways.
> 
> Anyways I give up -- the check is probably not needed, unless Andreas
> comes up with a good reason.

No, I haven't a good reason to restrict the base address to fewer
than 44 bits.

So the question is, should I completely remove that check or adapt it
to check for 44 bit instead of 36 bit?


Regards,

Andreas

-- 
AMD Saxony, Dresden, Germany
Operating System Research Center



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