linux-kernel - Re: [S390] cio: Make ccw_dev_id_is

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Date:	Mon, 04 Dec 2006 16:30:18 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Josef Sipek <jsipek@....cs.sunysb.edu>
Cc:	linux-kernel@...r.kernel.org, cornelia.huck@...ibm.com
Subject: Re: [S390] cio: Make ccw_dev_id_is_equal() more robust.

On Mon, 2006-12-04 at 10:23 -0500, Josef Sipek wrote:
> > diff -urpN linux-2.6/include/asm-s390/cio.h linux-2.6-patched/include/asm-s390/cio.h
> > --- linux-2.6/include/asm-s390/cio.h	2006-12-04 14:50:48.000000000 +0100
> > +++ linux-2.6-patched/include/asm-s390/cio.h	2006-12-04 14:51:00.000000000 +0100
> > @@ -278,7 +278,10 @@ struct ccw_dev_id {
> >  static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
> >  				      struct ccw_dev_id *dev_id2)
> >  {
> > -	return !memcmp(dev_id1, dev_id2, sizeof(struct ccw_dev_id));
> > +	if ((dev_id1->ssid == dev_id2->ssid) &&
> > +	    (dev_id1->devno == dev_id2->devno))
> > +		return 1;
> > +	return 0;
> >  }
> 
> Why not just:
> 
> return ((dev_id1->ssid == ......) && (...));

Yes, why not. It would be a little bit shorter. The compiler probably
won't care and generate the same code..

-- 
blue skies,
  Martin.

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH

"Reality continues to ruin my life." - Calvin.


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