linux-kernel - Re: smatch_scripts/whitespace

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Message-ID: <20100310142759.GG6321@bicker>
Date:	Wed, 10 Mar 2010 17:27:59 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	linux-kernel@...r.kernel.org, gregkh@...e.de,
	kernel-janitors@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: smatch_scripts/whitespace_only.sh

On Wed, Mar 10, 2010 at 11:14:53AM +0100, Julia Lawall wrote:
> On Wed, 10 Mar 2010, Dan Carpenter wrote:
> 
> > I wrote a script to check that a patch only changes white space.
> > It compiles the files before and after the patch is applied and 
> > verifies that they are the same.
> > 
> > You'll need to compile smatch:
> > 	git pull git://repo.or.cz/smatch.git
> > 	make
> > 	cd /path/to/kernel/src/
> > 	/path/to/smatch_scripts/whitespace_only.sh <patch>
> > 
> > Adding or removing parenthesis and curly braces counts as a code 
> > change.  Changes to comments, #if 0, white space changes do not.
> > 
> > You can fix a lot of style violations if you limit yourself to 
> > adding and removing tabs, spaces and new lines.  Then the next 
> > patch could remove unneeded parenthesis.  It would be easier to
> > audit that way instead of everything mixed together.
> > 
> > regards,
> > dan carpenter
> > 
> > PS.  I feel really bad slagging the newbies trying to help.  
> > Could we fix checkpatch.pl to not complain about line lengths?
> 
> I hope not...  Are newbies really put off by having to add a newline here 
> and there?
> 
> julia
> 

The problem is that newbies are only too happy to chop lines up into smaller 
and smaller bits.  :P  I've seen situations where the actual author of the code
broke up _his own_ perfectly reasonable code into tiny chunks just to satisfy 
checkpatch.pl.

				printk("blah blah blah blah"
						"blah blah"
						"blah");

It would be great if people dealt with checkpatch warnings by breaking
things out into separate functions and eliminating indent levels but 
that never happens.

regards,
dan carpenter

ps: Emacs starts with an 80 character window by default.  On my login
I have a ~/bin/emacs shell script that invoke real emacs as full screen.

#!/bin/sh
/usr/bin/emacs -fh -fw --no-splash $@

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