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 19:18:58 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
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."

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?

Dave.

Download attachment "0001-drm-radeon-kms-change-Kconfig-text-to-reflect-the-ne.patch" of type "application/octet-stream" (1663 bytes)