linux-kernel - Re: [PATCH 4/5] mm: add numa node symlink for cpu devices in sysfs

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Date:	Wed, 21 Oct 2009 13:30:02 -0600
From:	Alex Chiang <achiang@...com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] mm: add numa node symlink for cpu devices in sysfs

* David Rientjes <rientjes@...gle.com>:
> On Tue, 20 Oct 2009, Alex Chiang wrote:
> > * David Rientjes <rientjes@...gle.com>:
> > > The return values of register_cpu_under_node() and 
> > > unregister_cpu_under_node() are always ignored, so it would probably be 
> > > best to convert these to be void functions.  That doesn't mean you can 
> > > simply ignore the result of the first sysfs_create_link(), though: the 
> > > second should probably be suppressed if the first returns an error.
> > 
> > I didn't want to change too much in the patch. Changing the
> > function signature seems a bit overeager, but if you have strong
> > feelings, I can do so.
> 
> It's entirely up to you if you want to change them to be void.  I thought 
> it would be cleaner if the first patch in the series would convert them to 
> void on the basis that the return value is never actually used and then 
> the following patches simply return on error conditions.

I made the conversion as you suggested, but discovered under
sparse that:

	drivers/base/node.c: In function ‘register_cpu_under_node’:
	drivers/base/node.c:245: warning: ignoring return value of
	‘sysfs_create_link’, declared with attribute warn_unused_result

I wasn't very happy with the result after doing something with
the return value of sysfs_create_link to make sparse shutup.
Seemed unnatural and very much had the feeling of jumping through
hoops just to make an automated tool be quiet.

So, I'll just leave [un]register_cpu_under_node() as returning
int. It not only makes the patch feel better, but if we do ever
want to decide to unroll due to an error in sysfs_create_link,
we'll have the information available at the callsites.

Thanks.
/ac

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