From: Arjan van de Ven <arjan@infradead.org>
To: Ravikiran G Thirumalai <kiran@scalex86.org>
Cc: Ingo Molnar <mingo@elte.hu>,
venkatesh.pallipadi@intel.com, linux-kernel@vger.kernel.org,
tim@scalemp.com, shai@scalex86.org
Subject: Re: [patch] x86: Fix /dev/mem mmap breakage when PAT is disabled
Date: Thu, 30 Oct 2008 14:29:49 -0700 [thread overview]
Message-ID: <20081030142949.75df90cc@infradead.org> (raw)
In-Reply-To: <20081030212121.GB6583@localdomain>
On Thu, 30 Oct 2008 14:21:21 -0700
Ravikiran G Thirumalai <kiran@scalex86.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@scalex86.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
next prev parent reply other threads:[~2008-10-30 21:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-30 2:02 [patch] x86: Fix /dev/mem mmap breakage when PAT is disabled Ravikiran G Thirumalai
2008-10-30 18:29 ` Ingo Molnar
2008-10-30 20:59 ` Ravikiran G Thirumalai
2008-10-30 22:55 ` Ingo Molnar
2008-10-30 20:21 ` Arjan van de Ven
2008-10-30 21:21 ` Ravikiran G Thirumalai
2008-10-30 21:29 ` Arjan van de Ven [this message]
2008-10-30 21:54 ` Ravikiran G Thirumalai
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