linux-kernel - Re: [patch 2.6.29-rc6+misc] MMC: regulator utilities

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Message-ID: <20090302224040.5e7ab0b2@mjolnir.ossman.eu>
Date:	Mon, 2 Mar 2009 22:40:40 +0100
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	David Brownell <david-b@...bell.net>
Cc:	Mark Brown <broonie@...ena.org.uk>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	lkml <linux-kernel@...r.kernel.org>,
	OMAP <linux-omap@...r.kernel.org>
Subject: Re: [patch 2.6.29-rc6+misc] MMC: regulator utilities

On Mon, 2 Mar 2009 13:27:13 -0800
David Brownell <david-b@...bell.net> wrote:

> On Monday 02 March 2009, Pierre Ossman wrote:
> > On Thu, 26 Feb 2009 13:48:30 -0800
> > David Brownell <david-b@...bell.net> wrote:
> > 
> > > + */
> > > +int mmc_regulator_set_ocr(struct mmc_host *host, struct regulator *supply)
> > > +{
> > 
> > Why not pass the vdd directly? Saves a few dereferences if nothing else.
> 
> This call syntax is simpler, which is usually a win.
> Passing a third parameter would create fault paths
> of the "pass *wrong* parameter" flavor.
> 
> In terms of object code, when I've looked at such things
> the dereferences generally cost the same as a ref to a
> parameter, but passing an extra parameter isn't free.
> 

I couldn't see host being used in there, so I was thinking more of a
replacement, not an addition.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org

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