From: Arjan van de Ven <arjanv@redhat.com>
To: "David S. Miller" <davem@redhat.com>
Cc: Dave Airlie <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 22:08:15 +0200 [thread overview]
Message-ID: <20040827200815.GE23505@devserv.devel.redhat.com> (raw)
In-Reply-To: <20040827130415.754d4451.davem@redhat.com>
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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 ;)
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next prev parent reply other threads:[~2004-08-27 20:18 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 [this message]
2004-08-27 20:17 ` David S. Miller
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