linux-kernel - Re: [Bug #12608] 2.6.29-rc powerpc G5 Xorg legacy

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Message-Id: <1233791329.4612.23.camel@pasglop>
Date:	Thu, 05 Feb 2009 10:48:49 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Hugh Dickins <hugh@...itas.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [Bug #12608] 2.6.29-rc powerpc G5 Xorg legacy_mem regression

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@...itas.com>
> 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@...nel.crashing.org>
> 

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