linux-kernel - Re: [tip:core/locking] lockdep, bug: Exclude TAINT_FIRMWARE

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Date:	Tue, 06 Dec 2011 15:30:42 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Nick Bowler <nbowler@...iptictech.com>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/locking] lockdep, bug: Exclude
 TAINT_FIRMWARE_WORKAROUND from disabling lockdep

On Tue, 2011-12-06 at 10:13 -0500, Nick Bowler wrote:
> On 2011-12-06 01:38 -0800, tip-bot for Peter Zijlstra wrote:
> > Commit-ID:  df754e6af2f237a6c020c0daff55a1a609338e31
> > Gitweb:     http://git.kernel.org/tip/df754e6af2f237a6c020c0daff55a1a609338e31
> > Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > AuthorDate: Mon, 14 Nov 2011 13:13:49 +0100
> > Committer:  Ingo Molnar <mingo@...e.hu>
> > CommitDate: Tue, 6 Dec 2011 08:16:47 +0100
> > 
> > lockdep, bug: Exclude TAINT_FIRMWARE_WORKAROUND from disabling lockdep
> > 
> > It's unlikely that TAINT_FIRMWARE_WORKAROUND causes false
> > lockdep messages, so do not disable lockdep in that case.
> > We still want to keep lockdep disabled in the
> > TAINT_OOT_MODULE case:
> > 
> >   - bin-only modules can cause various instabilities in
> >     their and in unrelated kernel code
> > 
> >   - they are impossible to debug for kernel developers
> > 
> >   - they also typically do not have the copyright license
> >     permission to link to the GPL-ed lockdep code.
> 
> This is all bogus.  We have a proprietary module taint for the above.
> Out of tree does not mean "bin-only", "non-GPL" or anything else like
> that.  If the intent is to tell out of tree, GPL module developers to
> fuck off and die, then just go all the way and delete support for out
> of tree modules from Kbuild.  May as well go further and just prevent
> the kernel from loading such modules outright, too.
> 
> Don't gag developers by arbitrarily disabling kernel debugging
> functionality: functionality that they can use to debug their
> *GPL* modules.

I totally agree; *I* wanted to keep lockdep enabled for (GPL-compatible)
OOT modules.

Ben.

-- 
Ben Hutchings
Absolutum obsoletum. (If it works, it's out of date.) - Stafford Beer

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