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

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Date:	Mon, 2 Mar 2009 14:00:49 -0800
From:	David Brownell <david-b@...bell.net>
To:	Pierre Ossman <drzeus-mmc@...eus.cx>
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 Monday 02 March 2009, Pierre Ossman 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.

Oh, I see.  That'd make sense.  Just pass host->ios.vdd.



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