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Date:	Fri, 8 Aug 2014 09:09:19 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Tobias Klauser <tklauser@...tanz.ch>
Cc:	Gyungoh Yoo <gyungoh@...il.com>, rdunlap@...radead.org,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	jg1.han@...sung.com, cooloney@...il.com, plagnioj@...osoft.com,
	tomi.valkeinen@...com, grant.likely@...aro.org,
	sameo@...ux.intel.com, lee.jones@...aro.org, lgirdwood@...il.com,
	broonie@...nel.org, jack.yoo@...worksinc.com,
	florian.vaussard@...l.ch, jason@...edaemon.net, andrew@...n.ch,
	silvio.fricke@...il.com, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-fbdev@...r.kernel.org
Subject: Re: [PATCH] Adding a support for Skyworks SKY81452

On Thu, Aug 07, 2014 at 02:34:39PM +0200, Tobias Klauser wrote:
> On 2014-08-07 at 10:05:38 +0200, Gyungoh Yoo <gyungoh@...il.com> wrote:
[...]
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id sky81452_of_match[] = {
> > +	{.compatible = "sky,sky81452",},
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> > +#endif
> 
> The #ifdefery here is not needed since you use of_match_ptr below, whcih
> will expand to NULL of CONFIG_OF is not set.

On the contrary, that's exactly why the #ifdef is needed here. If you
don't guard the OF match table here, then of_match_ptr() evaluating to
NULL will cause the table to become unused and the compiler warning
about it.

Thierry

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