linux-kernel - Re: warning: massive change to conditional coding style in net?

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Date:	Mon, 30 Nov 2009 13:44:14 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	William Allen Simpson <william.allen.simpson@...il.com>
Cc:	Linux Kernel Developers <linux-kernel@...r.kernel.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: warning: massive change to conditional coding style in net?

On 30-11-2009 11:36, William Allen Simpson wrote:
> Over the past several days, David Miller (with help from Joe Perches)
> made sweeping changes to the format of conditional statements in the
> net tree -- the equivalent of mass patches that change spaces.
> 
> This makes writing patches for multiple versions of the tree very
> difficult, and will make future pullups problematic.  It's enough to
> make a grown man cry....  Patching conflicts everywhere!
> 
> CodingStyle is mute on this issue.  Does Linus have a preference?
> 
> My personal practice (based on decades of open source projects) has
> been to use a form already used in the same file or section of code,
> matching the existing practice.
> 
> If this is to be done everywhere, CodingStyle (and SubmittingPatches)
> should be updated.
> 
> Currently, roughly 19% (7855 lines) of the -2.6 tree uses leading form:
> 
> 	if (condition
> 	    && condition
> 	    && (condition
> 	        || condition
> 	        || condition)) {
> 
> Single spaced is also fairly common:
> 
> 	if (condition
> 	 && condition
> 	 && (condition
> 	  || condition
> 	  || condition)) {
> 
> The advantage of the leading form is *readability* due to indentation,
> ease of patching and reading patches (changes affect only 1 line,
> instead of previous and following lines), and especially conditionals
> within #if sections.  Also, shorter lines (by 3 characters).
> 
> The other 81% uses trailing form, often with odd random line breaks:
> 
> 	if (condition &&
>              condition && (condition || condition ||
> 	    condition)) {
> 
> Miller (with Perches) changed hundreds (thousands?) of these to
> trailing form.  This results in a number of hilarious examples --
> lines with both leading and trailing, lines with only &&, etc.  A
> small sample for illustration:

Yes, it's even enough to make a grown man laugh....

Jarek P.
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