From: Dave Jones <davej@redhat.com>
To: Jon Smirl <jonsmirl@gmail.com>
Cc: Andi Kleen <ak@muc.de>,
linux-kernel@vger.kernel.org,
DRI Devel <dri-devel@lists.sourceforge.net>
Subject: Re: chasing the four level page table
Date: Thu, 6 Jan 2005 16:41:59 -0500 [thread overview]
Message-ID: <20050106214159.GG16373@redhat.com> (raw)
In-Reply-To: <9e4733910501061205354c9508@mail.gmail.com>
On Thu, Jan 06, 2005 at 03:05:49PM -0500, Jon Smirl wrote:
> On 6 Jan 2005 20:38:27 +0100, Andi Kleen <ak@muc.de> wrote:
> > You can't use get_user_pages in this case because the AGP aperture
> > can be above mem_map. If none of the callers take page_table_lock
> > already you would need to add that too. I guess from the context the lock
> > is not taken, but better double check.
> >
> > Perhaps we should add a get_user_phys() or somesuch for this.
>
> No where in DRM is page_table_lock being taken. Also, no other device
> driver takes page_table_lock either, so that probably implies that DRM
> shouldn't start doing it to.
No other device driver is also doing such lowlevel stuff with
page tables directly afaics. drivers/char/drm seem to be the only drivers
using [pgd|pmd|pte]_offset() routines.
Dave
next prev parent reply other threads:[~2005-01-06 21:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-06 17:17 chasing the four level page table Jon Smirl
2005-01-06 18:12 ` Andi Kleen
2005-01-06 18:36 ` Jon Smirl
2005-01-06 19:38 ` Andi Kleen
2005-01-06 20:05 ` Jon Smirl
2005-01-06 21:41 ` Dave Jones [this message]
2005-01-08 5:22 ` Jon Smirl
2005-01-15 2:54 ` H. Peter Anvin
2005-01-15 3:37 ` Roland Dreier
2005-01-15 4:24 ` Andi Kleen
2005-01-15 5:59 ` Jon Smirl
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