linux-kernel - Re: [PATCH] bracing the loop in kernel/softirq.c

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Date:	Thu, 21 Jun 2007 23:11:09 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Jesper Juhl <jesper.juhl@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] bracing the loop in kernel/softirq.c

[Jeremy Fitzhardinge - Thu, Jun 21, 2007 at 11:52:25AM -0700]
> Jesper Juhl wrote:
>> On 20/06/07, Cyrill Gorcunov <gorcunov@...il.com> wrote:
>>> This trivial patch adds braces over a one-line
>>> loop. That makes code...well... little bit
>>> convenient for (possible) further modifications.
>>>
>> That's generally not done.
>>
>> It's even in Documentation/CodingStyle :
>>
>> "
>> Do not unnecessarily use braces where a single statement will do.
>>
>> if (condition)
>>        action();
>> "
>
> I tend to see "do {} while()" as an exception to this.  I find the 
> construct is sufficiently rare that it helps to emphasize it a bit.  For 
> example if I'm scanning code and I see:
>
> 	while (foo != NULL);
>
> in the corner of my eye, I'm going to think "huh?".  But:
>
> 	} while (foo != NULL);
>
> visually "parses" properly, regardless of how near or far the corresponding 
> "do  {" is.
>
> (And of course, its consistent with the super extra special while-while 
> loop:
>
> 	while (foo != NULL) {
> 		foo = bar();
> 		piffle();
> 	} while (foo != NULL);	// make sure we loop properly
>
> ;)
>
>    J
>

Indeed, 'do-while' is a special case.
Btw, Jeremy, I'm always getting into rapture on 'while-while' loop ;)

		Cyrill

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