Messages in this thread | | | Date | Fri, 27 Aug 2004 13:17:39 -0700 | From | "David S. Miller" <> | Subject | Re: drm fixup 2/2 - optimise i8x0 accesses.. |
| |
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.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |