Messages in this thread | | | Date | Fri, 27 Aug 2004 22:08:15 +0200 | From | Arjan van de Ven <> | Subject | Re: drm fixup 2/2 - optimise i8x0 accesses.. |
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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 ;) [unhandled content-type:application/pgp-signature] | |