linux-kernel - Re: [PATCH] module,bug: Add TAINT_OOT_MODULE flag for modules not built in-tree

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Message-ID: <20111026130834.GA6387@elliptictech.com>
Date:	Wed, 26 Oct 2011 09:08:34 -0400
From:	Nick Bowler <nbowler@...iptictech.com>
To:	Greg KH <greg@...ah.com>
Cc:	Dave Jones <davej@...hat.com>, Ben Hutchings <ben@...adent.org.uk>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Randy Dunlap <rdunlap@...otime.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Debian kernel maintainers <debian-kernel@...ts.debian.org>
Subject: Re: [PATCH] module,bug: Add TAINT_OOT_MODULE flag for modules not
 built in-tree

On 2011-10-25 22:54 +0200, Greg KH wrote:
> On Tue, Oct 25, 2011 at 04:17:24PM -0400, Dave Jones wrote:
> > On Tue, Oct 25, 2011 at 10:04:55PM +0200, Greg Kroah-Hartman wrote:
> >  > On Tue, Oct 25, 2011 at 12:51:42PM -0400, Nick Bowler wrote:
> >  > > This is not the case: lockdep works fine with staging modules.
> >  > 
> >  > Yes, that was fixed a few kernel versions ago.
> >  > 
> >  > Now you might want to update that fix for the TAINT_OOT_MODULE flag as
> >  > well, if you feel it is needed.
> > 
> > I'm assuming you mean this patch ?
> > 
> > commit 7816c45bf13255157c00fb8aca86cb64d825e878
> > Author: Roland Vossen <rvossen@...adcom.com>
> > Date:   Thu Apr 7 11:20:58 2011 +0200
> > 
> >     modules: Enabled dynamic debugging for staging modules
> 
> Hm, this is the patch I was thinking about yes.  But as you point out:
[...]
> Perhaps the lockdep thing is totally different.  I don't know about that
> check.

Lockdep is disabled (for the whole system) by add_taint itself.  The
relevant commit that fixes TAINT_CRAP appears to be this one (circa
2.6.30):

  commit 574bbe782057fdf0490dc7dec906a2dc26363e20
  Author: Frederic Weisbecker <fweisbec@...il.com>
  Date:   Sat Apr 11 03:17:18 2009 +0200
  
      lockdep: continue lock debugging despite some taints

I didn't know about the dynamic debug problem.  Is there more breakage
that we haven't found yet?  Remind me why we're trying to cripple out
of tree module users?

Cheers,
-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
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