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

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Date:	Sun, 24 Jan 2016 18:14:53 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Jonathan Cameron <jic23@...nel.org>,
	Dan Carpenter <dan.carpenter@...cle.com>
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 01/24/2016 05:36 PM, Jonathan Cameron wrote:
> 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 ;(

One thing we should maybe take a look at is making it explicit that this is
a string so it does not get picked up by checkpatch.