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

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Date:	Thu, 4 Feb 2010 21:34:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jerome Glisse <glisse@...edesktop.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Dave Airlie <airlied@...ux.ie>, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, dri-devel@...ts.sf.net
Subject: Re: hung bootup with "drm/radeon/kms: move radeon KMS on/off switch
 out of staging."


* Jerome Glisse <glisse@...edesktop.org> wrote:

> On Thu, Feb 04, 2010 at 08:19:35PM +0100, Ingo Molnar wrote:
> > 
> > * Matthew Garrett <mjg59@...f.ucam.org> wrote:
> > 
> > > On Thu, Feb 04, 2010 at 07:56:03PM +0100, Ingo Molnar wrote:
> > > 
> > > > Do you see my argument why any user who is hit by this would categorize 
> > > > this as a kernel regression in an existing driver?
> > > 
> > > No. If a user changes configuration and gets a hang, that's a bug but not a 
> > > regression.
> > 
> > Only if it's some brand-new driver or a brand-new kernel feature for which 
> > no-one can have any prior expectations of stability. Especially if it's added 
> > in the merge window when many new drivers are added.
> > 
> > But isnt it a regression to a user if it's shipped in -rc7 appearing as a new 
> > sub-option of an existing driver?
> > 
> > I'd wager that most main-street Linux users would consider that a regression.
> >  
> > As i see it is that you are trying to have it both ways: claim it's a new 
> > driver when it comes to handling regressions, but also try to have the 
> > benefits (and adoption flux) of an old driver when it comes to facing it to 
> > users.
> 
> We have been treating KMS regression as regression, [...]

Great!

> [...] i fixed numerous regressions since it was first merged as an staging 
> driver, and i keep doing so, i try to be as much reactive as i can. I am 
> sorry you have a bad experience about it. I just wanted to add that we 
> planed to move KMS out of staging in 2.6.33 long time ago and yes maybe we 
> should have done it earlier, but no matter when we do the change you will 
> still face this bug until we fix it.

I dont think you'll ever see my complain about a bug. I dont, and i introduce 
far too many of them to have any moral basis for complaint in any case ;-)

I only questioned the validity of this initial reaction by Dave Arlie:

 | Its not enabled by default so reverting this doesn't make much sense.
 |
 | We can just treat this as a normal driver bugreport.

> So on fixing the issue front, one question do you also enable radeonfb ? if 
> so then its likely the root issue of this bug, i think kconfig should 
> forbid having both radeon kms + radeonfb but i am not sure how allyesconfig 
> behave in respect of such constraint.

Please see the bugreprt i made in this thread, under the following subject:

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

It has all that info and more. (i've bounced it to you privately as well)

	Ingo
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