Backporting vmmouse kernel support to Fedora-22 kernel ?

[Josh Boyer]

On Fri, May 15, 2015 at 5:04 AM, Hans de Goede <hdegoede at redhat.com> wrote:
> Hi Josh,

Throwing kernel@ on CC.

> I'm mailing you because of:
> https://bugzilla.redhat.com/show_bug.cgi?id=1214474
>
> Rather then hacking around the problem discussed there
> (and then at one point in time needing to remove the hack).
>
> I would rather see us go straight to the final solution and
> backport the new vmmouse kernel driver (vs the old crufty lets
> bitbang from userspace driver still used today) to the F-22
> kernel, this would involve cherry-picking this single commit:
>
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit?id=8b8be51b4fd365ac5983e117be9d28f427a07b68
>
> This is not something which we should do for F-22 GA, but
> it would be good to do this for one of the first kernel
> updates after GA IMHO.

I saw this driver come in during the 4.1 merge window, but it's
disabled even in rawhide at the moment.  The Kconfig help text clearly
says we need the 13.0.1 version of the userspace driver, and rawhide
is only at 13.0.99.  F22 is at 13.0.0.

Additionally, I'm not sure we want to add a full Requires: in
kernel.spec for that version, because it will force the xorg driver to
be installed on all systems when most won't need it.  We could add an
Obsoletes if the userspace driver is truly no longer needed when the
in-kernel driver is present, but I'd need to know if that was actually
true.  Is there really no way for this to be backwards compatible?
I'm not opposed to backporting this eventually, but I think there's
some work to do on the xorg side as well?

josh