linux-kernel - Re: [PATCH net-next v2 1/3] ieee802154: cc2520: adds driver for TI CC2520 radio

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Message-ID: <20140618133958.GC11895@leverpostej>
Date:	Wed, 18 Jun 2014 14:39:58 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Varka Bhadram <varkabhadram@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"alex.bluesman.smirnov@...il.com" <alex.bluesman.smirnov@...il.com>,
	"dbaryshkov@...il.com" <dbaryshkov@...il.com>,
	"linux-zigbee-devel@...ts.sourceforge.net" 
	<linux-zigbee-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Varka Bhadram <varkab@...c.in>
Subject: Re: [PATCH net-next v2 1/3] ieee802154: cc2520: adds driver for TI
 CC2520 radio

On Wed, Jun 18, 2014 at 12:13:06PM +0100, Varka Bhadram wrote:
> On 06/18/2014 03:25 PM, Mark Rutland wrote:
> > On Wed, Jun 18, 2014 at 10:26:16AM +0100, Varka Bhadram wrote:
> >> +static int cc2520_probe(struct spi_device *spi)
> >> +{
> >> +       struct cc2520_private *priv;
> >> +       struct pinctrl *pinctrl;
> >> +       struct cc2520_platform_data *pdata;
> >> +       struct device_node __maybe_unused *np = spi->dev.of_node;
> >>
> >> This looks to be definitely unused rather than __maybe_unused. There are
> >> no other occuences of "np" in this function.
> >>
> >> This macro defined like this.
> >> #define __maybe_unused  __attribute__((unused))
> > Sure, but that's irrelevant. There's absolutely no point in this
> > variable existing at all, and it can simply disappear.
> >
> > Mark.
> 
> If we don't use that macro the compiler triggers warnings saying that:  warning: unused variable ‘np’ [-Wunused-variable]

Then drop the _variable_, not just the annotation.

Mark.
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