linux-kernel - Re: [PATCH] genhd must

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Date:	Wed, 12 Mar 2008 14:40:26 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] genhd must_check warning fix

On Wednesday 12 March 2008 14:25, Jeff Garzik wrote:
> Roland McGrath wrote:
> > Fixes:
> >
> > 	block/genhd.c:361: warning: ignoring return value of ‘class_register’,
> > declared with attribute warn_unused_result
> >
> > Signed-off-by: Roland McGrath <roland@...hat.com>
> > ---
> >  block/genhd.c |    4 +++-
> >  1 files changed, 3 insertions(+), 1 deletions(-)
> >
> > diff --git a/block/genhd.c b/block/genhd.c
> > index c44527d..00da521 100644
> > --- a/block/genhd.c
> > +++ b/block/genhd.c
> > @@ -360,7 +360,9 @@ static struct kobject *base_probe(dev_t devt, int
> > *part, void *data)
> >
> >  static int __init genhd_device_init(void)
> >  {
> > -	class_register(&block_class);
> > +	int error = class_register(&block_class);
> > +	if (unlikely(error))
> > +		return error;
> >  	bdev_map = kobj_map_init(base_probe, &block_class_lock);
> >  	blk_dev_init();
>
> ACK
>
> I was silly and simply tuned out this warning, assuming [wrongly] that
> it was difficult to fix like the fs/partitions.c warning.
>
> Shows how "helpful" those warnings are...

I don't see why? If the warning wasn't there, then Roland probably
wouldn't have noticed. So to me it shows that the warning actually
is helpful (without "") in this case.

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