linux-kernel - Re: [PATCH] genhd must

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Date:	Wed, 12 Mar 2008 15:07:38 +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 14:53, Jeff Garzik wrote:
> Nick Piggin wrote:
> > 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.
>
> The point was more that the warnings are so often silly that it teaches
> the human to tune out the warnings -- even when they turn out to reveal
> real problems, as in this case.

But the must_check warning? fs/partitions/check.c warning seems like it
is still a real error, whether or not it is hard to fix.


> I've been working quietly, the past several kernels, trying to kill most
> compiler warnings, so I've been paying close attention to this sort of
> stuff in general.

If you tune out the must_check warnings, then how is that better than
not having them at all? In either case, you'd have missed this genhd
bug(let).

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