linux-kernel - Re: [PATCH v6 2/2] Regulator: Add Anatop regulator driver

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Date:	Sun, 4 Mar 2012 13:29:53 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	"Ying-Chun Liu (PaulLiu)" <paul.liu@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org,
	Nancy Chen <Nancy.Chen@...escale.com>,
	Liam Girdwood <lrg@...com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH v6 2/2] Regulator: Add Anatop regulator driver

On Sun, Mar 04, 2012 at 02:51:48PM +0800, Shawn Guo wrote:

> > +	sreg = devm_kzalloc(dev, sizeof(struct anatop_regulator), GFP_KERNEL);
> > +	if (!sreg)
> > +		return -EINVAL;
> > +	rdesc = devm_kzalloc(dev, sizeof(struct regulator_desc), GFP_KERNEL);
> > +	if (!rdesc)
> > +		return -EINVAL;

> Would something like the following be better?

> 	sreg = devm_kzalloc(dev, sizeof(*sreg) + sizeof(*rdesc), GFP_KERNEL);
> 	if (!sreg)
> 		return -ENOMEM;
> 	rdesc = (struct regulator_desc *)(sreg + 1);

No, that sort of pointer arithmetic would be much worse - it's harder to
read and more likely to break.  However, embedding the regulator_desc in
sreg would achieve the same result without the legibility issues.

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