linux-kernel - Re: [patch] checkpatch: relax spacing and line length

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Message-ID: <480470C6.6050908@panasas.com>
Date:	Tue, 15 Apr 2008 12:09:26 +0300
From:	Benny Halevy <bhalevy@...asas.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	Andy Whitcroft <apw@...dowen.org>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	SL Baur <steve@...acs.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Richard Knutsson <ricknu-0@...dent.ltu.se>,
	Stefan Richter <stefanr@...6.in-berlin.de>
Subject: Re: [patch] checkpatch: relax spacing and line length

On Apr. 13, 2008, 18:18 +0300, Al Viro <viro@...IV.linux.org.uk> wrote:
> On Sun, Apr 13, 2008 at 12:53:48PM +0300, Benny Halevy wrote:
> 
>>> Sorry.  I'm not going to change perfectly working editing habits *or* to patch
>> That's working well for you but apparently not so well for everybody else.
> 
> Nice turn of a phrase, that.
> 
>>> nvi to satisfy an annoying wunch of bankers.  HAND, GAFL.
>>> --
>> Thanks for the insightful and mature comment, Al.
> 
> Oh, for the...
> 
>> I really hate to spend more time on this topic but folks did find merits in it.
>> There's no need to change anybody's editing habits if we allow this indentation
>> style in the CodingStyle document and in checkpatch.pl in addition to the
>> existing convention.
> 
> "Allow" is such a nice word, isn't it?  Let's take a closer look:
> 	* nobody prohibits lines satisfying your constraints ("tabs only for
> indent level"), so "allowing" that is meaningless

Currently checkpatch.pl prints an error if I use 8 or more spaces in the
indentation string and Documentation/CodingStyle says:

"Outside of comments, documentation and except in Kconfig, spaces are never
used for indentation"

Although CodingStyle and checkpatch just provide guidance and the final
word is the maintainer's I consider these recommendations as "disallowing",
or at least "discouraging". So did others that commented on patches I sent
in the past.  If that wasn't the case I wouldn't have come up with this
silly initiative in the first place.

> 	* "indentation style" in the above refers to editor settings.
> To "allow" that, you advocate prohibiting the lines _NOT_ satisfying your
> constraints.  Which, by definition, means extra work for people submitting
> patches, no matter how you spin it.

I'm certainly not advocating to prohibit the current indentation style,
just to relax the rules to allow a superset of it.

Basically, I'd like checkpatch to allow /^\+\t* *\S/
and, since Andy says that checkpatch knows "the indent to some degree",
it can warn if the number of leading tabs is smaller than that.

> 
> BTW, while we are talking about conventions, would you mind keeping lines
> in your mail shorter than 79 columns to avoid wraparounds in quoted text?
> Unlike your proposal, that one actually _is_ a common convention...

No, I don't mind.

[Though it is a bit of a pain to keep that when automatic wrapping of long
lines is turned off in my mail program so I can easily quote patches or
code snippets.]

Benny

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