linux-kernel - Re: [PATCH UPDATED 10/13] block, cfq: unlink cfq_io

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Message-ID: <20111027170524.GH7491@redhat.com>
Date:	Thu, 27 Oct 2011 13:05:24 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH UPDATED 10/13] block, cfq: unlink cfq_io_context's
 immediately

On Thu, Oct 27, 2011 at 09:17:01AM -0700, Tejun Heo wrote:
> Hello,
> 
> On Thu, Oct 27, 2011 at 10:31:19AM -0400, Vivek Goyal wrote:
> > On Wed, Oct 26, 2011 at 02:31:07PM -0700, Tejun Heo wrote:
> > >  	BUG_ON(atomic_long_read(&ioc->refcount) <= 0);
> > > +	if (locked_q)
> > > +		lockdep_assert_held(locked_q->queue_lock);
> > >  
> > 
> > Looks like lockdep_assert_held() can't be used if !CONFIG_LOCKDEP. So
> > Jens had put following patch to fix one compilation issue. You might
> > want to provide a null definition of lockdep_assert_held() in case
> > of !CONFIG_LOCKDEP.
> > 
> > commit 334c2b0b8b2ab186fa198413386cba41fffcb4f2
> > Author: Jens Axboe <axboe@...nel.dk>
> > Date:   Tue Oct 25 15:51:48 2011 +0200
> > 
> >     blk-throttle: use queue_is_locked() instead of lockdep_is_held()
> >     
> >     We can't use the latter if !CONFIG_LOCKDEP.
> >     
> >     Reported-by: Sedat Dilek <sedat.dilek@...glemail.com>
> >     Signed-off-by: Jens Axboe <axboe@...nel.dk>
> 
> Eh?  lockdep.h has dummy definition if !CONFIG_LOCKDEP.

I can't seem to find the dummy definition in include/linux/lockdep.h for
!CONFIG_LOCKDEP.

I see only following under CONFIG_LOCKDEP.

#define lockdep_is_held(lock)   lock_is_held(&(lock)->dep_map)

and nothing under #else clause.

Thanks
Vivek
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