linux-kernel - Re: CONFIG_PROVE_RCU breaks proprietary modules (rcu_lock

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Message-ID: <20100620151605.GA2396@linux.vnet.ibm.com>
Date:	Sun, 20 Jun 2010 08:16:05 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Kyle McMartin <kyle@...artin.ca>
Cc:	Tilman Schmidt <tilman@...p.cc>, linux-kernel@...r.kernel.org
Subject: Re: CONFIG_PROVE_RCU breaks proprietary modules (rcu_lock_map)

On Thu, Jun 17, 2010 at 06:37:47AM -0400, Kyle McMartin wrote:
> On Mon, Mar 29, 2010 at 11:40:59AM -0700, Paul E. McKenney wrote:
> > > > I am comfortable with PROVE_RCU being incompatible with non-GPL modules.
> > > > After all, it is only a debugging option, not intended for production use.
> > > 
> > > I agree completely. I just wanted to publish that fact because it seems
> > > to be little known and can be quite a puzzler.
> > 
> > And I do very much appreciate your publicizing the solution!  ;-)
> > 
> 
> Hi Paul,
> 
> (Sorry I didn't bring this up until now.)
> 
> I don't really have any sympathy for people who use that crud, but from
> my POV it's going to generate some grief. Fedora builds rawhide with a
> lot of debugging options enabled in order to try and hit issues early
> before kernels release.
> 
> A few weeks ago, I noticed a report that PROVE_RCU was breaking some
> non-GPL junk. Digging a bit further, I noticed quite a number of more
> reports of this.
> 
> Is there any chances you could reconsider this? Otherwise I'll probably
> disable the option in Fedora's debug kernels as well if I continue to
> see confused users.

Hello, Kyle,

My kneejerk reaction is that PROVE_RCU is a developer tool, so I am
OK with it not being set by default in Rawhide.  Or have you seen good
value from (say) PROVE_LOCKING in Rawhide?

							Thanx, Paul
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