linux-kernel - Re: [PATCH] iio: adc: dln2-adc: initialize local struct before using it

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Date:   Wed, 13 Sep 2017 17:52:32 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Martin Kepplinger <martink@...teo.de>
Cc:     kbuild test robot <lkp@...el.com>, kbuild-all@...org,
        knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: dln2-adc: initialize local struct before
 using it

On Tue, 12 Sep 2017 09:01:27 +0200
Martin Kepplinger <martink@...teo.de> wrote:

> Am 12.09.2017 03:32 schrieb kbuild test robot:
> > Hi Martin,
> > 
> > [auto build test WARNING on iio/togreg]
> > [also build test WARNING on next-20170911]
> > [cannot apply to v4.13]
> > [if your patch is applied to the wrong git tree, please drop us a note
> > to help improve the system]
> > 
> > url:
> > https://github.com/0day-ci/linux/commits/Martin-Kepplinger/iio-adc-dln2-adc-initialize-local-struct-before-using-it/20170912-064250
> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git 
> > togreg
> > config: tile-allyesconfig (attached as .config)
> > compiler: tilegx-linux-gcc (GCC) 4.6.2
> > reproduce:
> >         wget
> > https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross
> > -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         # save the attached .config to linux build tree
> >         make.cross ARCH=tile
> > 
> > All warnings (new ones prefixed by >>):
> > 
> >    drivers/iio/adc/dln2-adc.c: In function 'dln2_adc_trigger_h':  
> >>> drivers/iio/adc/dln2-adc.c:492:2: warning: missing braces around 
> >>> initializer [-Wmissing-braces]  
> >    drivers/iio/adc/dln2-adc.c:492:2: warning: (near initialization for
> > 'data.values') [-Wmissing-braces]
> > 
> > vim +492 drivers/iio/adc/dln2-adc.c
> > 
> >    484
> >    485	static irqreturn_t dln2_adc_trigger_h(int irq, void *p)
> >    486	{
> >    487		struct iio_poll_func *pf = p;
> >    488		struct iio_dev *indio_dev = pf->indio_dev;
> >    489		struct {
> >    490			__le16 values[DLN2_ADC_MAX_CHANNELS];
> >    491			int64_t timestamp_space;  
> >  > 492		} data = { 0 };  
> 
> 
> ok :) I guess
> 
>     } data = {{ 0 }};
> 
> would be ok for gcc in this case. How far has this patch gone? Do you 
> want a fix
> on top or the patch re-done? Or do you just do it yourself?
>
I'm  unconvinced the patch is necessary as I think all elements of
that structure are initialized anyway before they are used.

I might be missing a code path where that isn't true though so
feel free to point one out!

Jonathan
 
> thanks,
> 
>                    martin