Re: [Bug #12608] 2.6.29-rc powerpc G5 Xorg legacy_mem regression

Benjamin Herrenschmidt
2009-02-04T23:48:49Z

On Wed, 2009-02-04 at 11:24 +0100, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of recent regressions.
>
> The following bug entry is on the current list of known regressions
> from 2.6.28. Please verify if it still should be listed and let me know
> (either way).

I still don't know what's the best way to handle that one... the bug is
in X and I don't see a way to work around it without removing support
for legacy memory access from the kernel :-( Or doing it in a way that
doesn't allow userspace to differenciate between the kernel not
supporting it vs. the HW not supporting it, causing X to fallback to
even more broken crap.

I'll try to find out the extent of the X problem and whether that's
fixable in a way that can hit distros.

>
> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12608
> Subject : 2.6.29-rc powerpc G5 Xorg legacy_mem regression
> Submitter : Hugh Dickins <hugh-DTz5qymZ9yRBDgjK7y7TUQ@public.gmane.org>
> Date : 2009-01-21 21:12 (15 days old)
> First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d3a54014e2a94bd37b7dee5e76e03f7bc4fab49a
> References : http://marc.info/?l=linux-kernel&m=123257250431870&w=4
> Handled-By : Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
>