linux-kernel - Re: [patch 2/3] ps3: BD/DVD/CD-ROM Storage Driver

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Message-Id: <20070719021752.35cb7daa.akpm@linux-foundation.org>
Date:	Thu, 19 Jul 2007 02:17:52 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	Paul Mackerras <paulus@...ba.org>, Jens Axboe <axboe@...nel.dk>,
	"James E.J. Bottomley" <James.Bottomley@...elEye.com>,
	Alessandro Rubini <rubini@...ion.unipv.it>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	Geoff Levand <geoffrey.levand@...sony.com>
Subject: Re: [patch 2/3] ps3: BD/DVD/CD-ROM Storage Driver

On Thu, 19 Jul 2007 11:02:07 +0200 (CEST) Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com> wrote:

> On Wed, 18 Jul 2007, Andrew Morton wrote:
> > > +struct ps3rom_private {
> > > +	struct ps3_storage_device *dev;
> > > +	struct scsi_cmnd *curr_cmd;
> > > +};
> > > +#define ps3rom_priv(dev)	((dev)->sbd.core.driver_data)
> > > +
> > 
> > Someone should invent a keyboard which delivers an electric shock when the
> > operator types "#define".   In the meanwhile, I get to do the honours.
> > 
> > Please don't implement in a macro anything which can be implemented in C.
> 
> All I needed was a shorthand to access driver_data, for both read and write
> access (you cannot do the latter with C, unless you decouple read and write).

Oh dear.

	ps3rom_priv(dev) = host;

that's 'orrid.  We have an identifier pretending to be a function, only we
go and treat it as an lvalue.

I mean, C code should look like C code, and the above just doesn't.

Sigh.
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