linux-kernel - Re: [PATCH 1/2] staging:iio:adc:added space around '-'

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Date:	Sun, 24 Jan 2016 16:36:15 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Bhumika Goyal <bhumirks@...il.com>, devel@...verdev.osuosl.org,
	Michael.Hennerich@...log.com, linux-iio@...r.kernel.org,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	pmeerw@...erw.net
Subject: Re: [PATCH 1/2] staging:iio:adc:added space around '-'

On 20/01/16 14:21, Dan Carpenter wrote:
> On Fri, Jan 15, 2016 at 09:15:52PM +0100, Lars-Peter Clausen wrote:
>> On 01/15/2016 08:42 PM, Bhumika Goyal wrote:
>>> This patch adds apace around '-' operator.Found using checkpatch.pl
>>>
>>> Signed-off-by: Bhumika Goyal <bhumirks@...il.com>
>>> ---
>>>  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 f45ebed..0c73bce 100644
>>> --- a/drivers/staging/iio/adc/ad7280a.c
>>> +++ b/drivers/staging/iio/adc/ad7280a.c
>>> @@ -744,14 +744,14 @@ out:
>>>  }
>>>  
>>>  static IIO_DEVICE_ATTR_NAMED(in_thresh_low_value,
>>> -		in_voltage-voltage_thresh_low_value,
>>> +		in_voltage - voltage_thresh_low_value,
>>
>> Hi,
>>
>> Thanks for patch. But when sending cleanup patches like this please make
>> sure that you a) understand what the code does and how your change affects
>> it and b) as a bare minimum of testing perform a compile test, if possible
>> also do functional testing.
>>
>> The patch as it is, is neither semantically nor syntactically correct. As an
>> exercise please make sure you understand why.
> 
> Ugh!
> 
> It took me a long time to figure out the bug in this patch...  Why does
> that filename have a mix of dashes and underscores?  Too late to fix it
> now...  :/
> 
Very deliberately.  The - is indicating it is a differential channel!
Literally A minus B.

It's an awfully compact representation for maths ;)
This is obscured partly in this case as it's specifying an attribute
shared by a set of differential channels so it's the generalization
of
in_voltage0-voltage1_thresh_low_value
which does begin to slightly stretch the argument that it is nice and
clear ;(

Jonathan
> regards,
> dan carpenter
> 
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