From: Andi Kleen <ak@suse.de>
To: "Jan Beulich" <jbeulich@novell.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] i386/PAE: avoid temporarily inconsistent pte-s
Date: Wed, 19 Sep 2007 18:17:30 +0200 [thread overview]
Message-ID: <200709191817.30569.ak@suse.de> (raw)
In-Reply-To: <46F16779.76E4.0078.0@novell.com>
On Wednesday 19 September 2007 18:16:25 Jan Beulich wrote:
> >>> Andi Kleen <ak@suse.de> 19.09.07 18:09 >>>
> >On Wednesday 19 September 2007 16:39:39 Jan Beulich wrote:
> >> One more of these issues (which were considered fixed a few releases
> >> back): Other than on x86-64, i386 allows set_fixmap() to replace
> >> already present mappings. Consequently, on PAE, care must be taken to
> >> not update the high half of a pte while the low half is still holding
> >> the old value.
> >
> >Hmm perhaps it would be better to just forbid it on i386 too.
> >Do you know who uses it?
>
> PCI's mmconfig accessor. One could of course make it call clear_fixmap() prior
> to establishing a new mapping, but I thought that was not intended and is the
> reason for allowing this.
Makes sense. Applied thanks.
-Andi
prev parent reply other threads:[~2007-09-19 16:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-19 14:39 [PATCH] i386/PAE: avoid temporarily inconsistent pte-s Jan Beulich
2007-09-19 16:09 ` Andi Kleen
2007-09-19 16:16 ` Jan Beulich
2007-09-19 16:17 ` Andi Kleen [this message]
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