From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753667AbcAXQgV (ORCPT ); Sun, 24 Jan 2016 11:36:21 -0500 Received: from saturn.retrosnub.co.uk ([178.18.118.26]:45560 "EHLO saturn.retrosnub.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751608AbcAXQgS (ORCPT ); Sun, 24 Jan 2016 11:36:18 -0500 Subject: Re: [PATCH 1/2] staging:iio:adc:added space around '-' To: Dan Carpenter , Lars-Peter Clausen References: <115dd2e3f67706fd323c18b23871068ad36dfa94.1452878721.git.bhumirks@gmail.com> <56995378.1010204@metafoo.de> <20160120142137.GC6370@mwanda> Cc: Bhumika Goyal , devel@driverdev.osuosl.org, Michael.Hennerich@analog.com, linux-iio@vger.kernel.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, pmeerw@pmeerw.net From: Jonathan Cameron Message-ID: <56A4FD7F.6010800@kernel.org> Date: Sun, 24 Jan 2016 16:36:15 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 MIME-Version: 1.0 In-Reply-To: <20160120142137.GC6370@mwanda> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 >>> --- >>> 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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-iio" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >