linux-kernel - Re: [PATCH] staging: iio: adc: ad7280: Add spaces around math operator

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Message-ID: <20191110181935.GA3378@ubuntu>
Date:   Sun, 10 Nov 2019 19:19:35 +0100
From:   Pedro Ortega <portega.kernel@....com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Stefan Popa <stefan.popa@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: iio: adc: ad7280: Add spaces around math
 operator

On Sun, Nov 10, 2019 at 01:27:10PM +0000, Jonathan Cameron wrote:
> On Sat,  9 Nov 2019 16:17:28 +0100
> Pedro Ortega <portega.kernel@....com> wrote:
>
> > Add spaces around the minus math operator to increase readability.
> >
> > Signed-off-by: Pedro Ortega <portega.kernel@....com>
> Hi Pedro,
>
> Afraid not.  Look at what that macro is actually doing.  That's not a maths
> operator at all.  I'm fairly sure we had a plan to actually hide these
> examples away as we get a few people suggesting this 'fix' ever year.
> Not sure what happened to them though, I'll have to check back.

I'm sorry. Next time I will review the code much more carefully. The macro
IIO_DEVICE_ATTR_NAMED expand the second parameter to a string. So, the hyphen
is not a maths operator.

>
> Sorry about this, but it is a good lesson in making sure you check
> that the suggestion from checkpatch is actually correct.  It's a
> pattern matcher, it can't always know enough to be able to tell what
> is going on.

First lesson learned.
>
> Thanks,
>
> Jonathan

Thanks,

Pedro
>
> > ---
> >  drivers/staging/iio/adc/ad7280a.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
> > index 19a5f244dcae..34ca0d09db85 100644
> > --- a/drivers/staging/iio/adc/ad7280a.c
> > +++ b/drivers/staging/iio/adc/ad7280a.c
> > @@ -825,14 +825,14 @@ static irqreturn_t ad7280_event_handler(int irq, void *private)
> >  }
> >
> >  static IIO_DEVICE_ATTR_NAMED(in_thresh_low_value,
> > -			     in_voltage-voltage_thresh_low_value,
> > +			     in_voltage - voltage_thresh_low_value,
> >  			     0644,
> >  			     ad7280_read_channel_config,
> >  			     ad7280_write_channel_config,
> >  			     AD7280A_CELL_UNDERVOLTAGE);
> >
> >  static IIO_DEVICE_ATTR_NAMED(in_thresh_high_value,
> > -			     in_voltage-voltage_thresh_high_value,
> > +			     in_voltage - voltage_thresh_high_value,
> >  			     0644,
> >  			     ad7280_read_channel_config,
> >  			     ad7280_write_channel_config,
> > --
> > 2.17.1
> >
>