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

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Message-ID: <20070719094100.GF11657@kernel.dk>
Date:	Thu, 19 Jul 2007 11:41:01 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Mackerras <paulus@...ba.org>,
	"James E.J. Bottomley" <James.Bottomley@...elEye.com>,
	Linux/PPC Development <linuxppc-dev@...abs.org>,
	Linux Kernel Development <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, Jul 19 2007, Geert Uytterhoeven wrote:
> On Thu, 19 Jul 2007, Andrew Morton wrote:
> > 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.
> 
> Do you prefer
> 
> static inline struct ps3rom_private *ps3rom_priv_get(struct ps3_storage_device
> *dev)
> {
> 	return dev->sbd.core.driver_data;
> }
> 
> static inline void ps3rom_priv_set(struct ps3_storage_device *dev,
> 				   struct ps3rom_private *priv)
> {
> 	dev->sbd.core.driver_data = priv;
> }

how about just killing them? it makes the code harder to read, what is
the point of abstracting something like that out?

-- 
Jens Axboe

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