Re: drm fixup 2/2 - optimise i8x0 accesses..

[David S. Miller]

On Fri, 27 Aug 2004 22:08:15 +0200
Arjan van de Ven <arjanv@xxxxxxxxxx> 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@xxxxxxxx> 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.

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