From: "David S. Miller" <davem@redhat.com>
To: Arjan van de Ven <arjanv@redhat.com>
Cc: airlied@linux.ie, torvalds@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: drm fixup 2/2 - optimise i8x0 accesses..
Date: Fri, 27 Aug 2004 13:17:39 -0700 [thread overview]
Message-ID: <20040827131739.6be24ee0.davem@redhat.com> (raw)
In-Reply-To: <20040827200815.GE23505@devserv.devel.redhat.com>
On Fri, 27 Aug 2004 22:08:15 +0200
Arjan van de Ven <arjanv@redhat.com> wrote:
> On Fri, Aug 27, 2004 at 01:04:15PM -0700, David S. Miller wrote:
> > On Fri, 27 Aug 2004 15:13:54 +0100 (IST)
> > Dave Airlie <airlied@linux.ie> wrote:
> >
> > > the patch below optimises the drm code to not do put_user() on memory the
> > > kernel allocated and then mmap-installed to userspace, but instead makes it
> > > use the kernel virtual address directly instead.
> >
> > This might cause major problems on systems with virtually indexed
> > caches if precautions are not made at buffer allocation time such
> > that the virtual cache color of the kernel mapping is the same
> > as the user mapping.
>
> actually it's uncachable memory ;)
Then no problem :-) Thanks for clearing that up.
prev parent reply other threads:[~2004-08-27 20:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-27 14:13 drm fixup 2/2 - optimise i8x0 accesses Dave Airlie
2004-08-27 20:04 ` David S. Miller
2004-08-27 20:08 ` Arjan van de Ven
2004-08-27 20:17 ` David S. Miller [this message]
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