linux-kernel - Re: hung bootup with "drm/radeon/kms: move radeon KMS on/off switch out of staging."

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Date:	Fri, 5 Feb 2010 11:47:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Dave Airlie <airlied@...il.com>
Cc:	Dave Airlie <airlied@...ux.ie>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	dri-devel@...ts.sf.net, Alex Deucher <alexdeucher@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org
Subject: Re: hung bootup with "drm/radeon/kms: move radeon KMS on/off switch
 out of staging."


* Dave Airlie <airlied@...il.com> wrote:

> On Fri, Feb 5, 2010 at 7:00 PM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Dave Airlie <airlied@...ux.ie> wrote:
> >
> >>
> >> > If it now does not boot up if all its sub-options are enabled, even of some
> >> > of those sub-options are new, does that count as a driver regression? Sure it
> >> > does to me ...
> >>
> >> But it doesn't to anyone else under any reasonable meaning of the word
> >> regression.
> >
> > There are reactions in this thread that contradict your 'anyone else' point.
> >
> >> The config option states
> >> "Choose this option if you want kernel modesetting enabled by default,
> >> ? ? ? ? ? and you have a new enough userspace to support this. Running old
> >> ? ? ? ? ? userspaces with this enabled will cause pain."
> >>
> >> Will cause pain sounds painful to me, I can make it seem much worse if
> >> you'd like.
> >
> > Except you are missing that the hang (and the first crash as well) happens on
> > brand-new user-space just as much - not just on 'old userspaces'.
> >
> > The bugs i've triggered are independent of any user-space component - it
> > happens with a fresh distro just as much.
> >
> > As i suggested before, at least the text should be updated to include what
> > has been written about CONFIG_DRM_RADEON_KMS in this thread before:
> >
> > ?> This is a completely new driver. ?It's only part of the existing drm for
> > ?> compatibility reasons. ?It requires an entirely different graphics stack
> > ?> above it and works very differently from the old drm stack.
> >
> 
> Okay I've attached a patch with a revised Kconfig in it.
> 
> Does this sound more like reality?

Looks perfect to me!

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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