linux-kernel - Re: [PATCH RFC] checkpatch: flag split arithmetic operations with CHECK

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Date:	Tue, 05 May 2015 08:44:50 -0700
From:	Joe Perches <joe@...ches.com>
To:	Nicholas Mc Guire <der.herr@...r.at>
Cc:	Andy Whitcroft <apw@...onical.com>,
	Nicholas Mc Guire <hofrat@...dl.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] checkpatch: flag split arithmetic operations with
 CHECK

On Tue, 2015-05-05 at 16:08 +0200, Nicholas Mc Guire wrote:
> On Tue, 05 May 2015, Andy Whitcroft wrote:
> > On Tue, May 05, 2015 at 10:53:36AM +0200, Nicholas Mc Guire wrote:
> > > Simple arithmetic operations should be on one line, if they can be fit,
> > > rather than splitting at the operator. As this is not in the CodingStyle it 
> > > is limited to --strict use of checkpatch.pl and emits a CHECK only.
[]
> > I assume that these relate to being able to confirm the variant of the
> > operator, unary/binary etc.  If you look for "annotate_values", after
> > that is run there is additional information for each character of the
> > current line, tracking the type of the operator.  This is used when
> > determining spacing for + etc later as unary ones are typically tight
> > bound and binary ones spaced out.  You might find that useful, if that
> > is your issue.  And indeed you might find it useful for determining if
> > the +/- you find at line end is indeed unary.  Running with --debug
> > values=1 should dump out the variants information for those.
> >
> thanks - looks like a useful (somewhat cryptic) starting point
> 
> 15 > .  x = y - x
> 15 > EEEVVNNVVNNTTT
> 15 >  ________B____
> 
> will give it a try to generalize it for all basic binary operators.

Look at the code for "# Check operator spacing" around line 3600.
It's a pretty big block of ~300 lines of code, but this new test
should go in there.


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