linux-kernel - Re: 2.6.25-rc7-git2: Reported regressions from 2.6.24

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Date:	Fri, 28 Mar 2008 17:17:17 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>
Subject: Re: 2.6.25-rc7-git2: Reported regressions from 2.6.24

On Friday, 28 of March 2008, Adrian Bunk wrote:
> On Fri, Mar 28, 2008 at 12:16:03PM +0100, Thomas Gleixner wrote:
> > On Fri, 28 Mar 2008, Adrian Bunk wrote:
> > > On Fri, Mar 28, 2008 at 12:00:25PM +0100, Peter Zijlstra wrote:
> > > > On Fri, 2008-03-28 at 11:58 +0100, Thomas Gleixner wrote:
> > > > > On Fri, 28 Mar 2008, Thomas Gleixner wrote:
> > > > > > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=9969
> > > > > > > Subject		: 2.6.24-git15 Keyboard Issue?
> > > > > > > Submitter	: Chris Holvenstot <cholvenstot@...cast.net>
> > > > > > > Date		: 2008-02-06 14:02 (51 days old)
> > > > > > > References	: http://lkml.org/lkml/2008/2/6/100
> > > > > > > 		  http://lkml.org/lkml/2008/2/13/82
> > > > > > > Handled-By	: Thomas Gleixner <tglx@...utronix.de>
> > > > > > > Patch		: http://lkml.org/lkml/2008/2/15/343
> > > > > >  
> > > > > > asked the bug reporter for an update.
> > > > > 
> > > > > Now that lkml.org is working again, I checked the patch which is
> > > > > referenced above and I have a hard time to connect it even remotely to
> > > > > that bug.
> > > > > 
> > > > > As far as I can tell the discussion on lkml identified GROUP_SCHED=y
> > > > > as the culprit, but I have no idea whether there was any resolution
> > > > > other than disabling GROUP_SCHED.
> > > > > 
> > > > > Peter ??
> > > > 
> > > > Correct, I am working on the issue but that's not going to be .25 stuff.
> > > 
> > > How are we going to get 2.6.25 working no worse than 2.6.24?
> > > 
> > > Letting GROUP_SCHED depend on BROKEN would sound logical, but that would 
> > > also kill FAIR_GROUP_SCHED.
> > 
> > I think default it to off should be sufficient.
> 
> A system administrator saying yes to GROUP_SCHED when running
> "make oldconfig" can hardly be blamed for doing so, and "makes your 
> mouse and keyboard unusable" mustn't be the result.
> 
> Avoiding unexpected breakages when toggling an option is _much_ more 
> important than e.g. whether some exotic randconfig configuration 
> compiles.

Perhaps add something like "(UNRELIABLE)" to the Kconfig option?

Rafael
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