linux-kernel - Re: [patch] x86: Fix /dev/mem mmap breakage when PAT is disabled

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Message-ID: <20081030142949.75df90cc@infradead.org>
Date:	Thu, 30 Oct 2008 14:29:49 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ravikiran G Thirumalai <kiran@...lex86.org>
Cc:	Ingo Molnar <mingo@...e.hu>, venkatesh.pallipadi@...el.com,
	linux-kernel@...r.kernel.org, tim@...lemp.com, shai@...lex86.org
Subject: Re: [patch] x86: Fix /dev/mem mmap breakage when PAT is disabled

On Thu, 30 Oct 2008 14:21:21 -0700
Ravikiran G Thirumalai <kiran@...lex86.org> wrote:

> On Thu, Oct 30, 2008 at 01:21:03PM -0700, Arjan van de Ven wrote:
> >On Wed, 29 Oct 2008 19:02:03 -0700
> >Ravikiran G Thirumalai <kiran@...lex86.org> wrote:
> >
> >well... technically the aliases are bad without PAT as well...
> >
> 
> Hmm! Well, you mean if mtrr is used to change attributes?

you can also set uncached in the pagetables, like via ioremap_uncached
and other ways.

and /dev/mem may or may not imply cached/uncached, depending on the
open flags.

On memory... what would that mean?

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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