linux-kernel - Re: Coding style on function signatures (was: Convert tasklets to work queues )

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Date:	Sat, 7 Jul 2007 21:37:53 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Jim Cromie <jim.cromie@...il.com>
Cc:	Linux kernel <linux-kernel@...r.kernel.org>,
	Randy Dunlap <rdunlap@...otime.net>, davem@...emloft.net
Subject: Re: Coding style on function signatures  (was: Convert tasklets to
 work queues )

On Sat, 07 Jul 2007 18:49:07 -0600 Jim Cromie wrote:

> Linus Torvalds wrote:
> >
> >   
> > Yes, code should be less than 80 characters wide. 
> >
> > But hey, sometimes it's just more readable to have one line that is 
> > slightly longer than it should be, than to split something that is awkward 
> > to split. 
> >
> >   
> < cc-list heavily trimmed >
> 
> 
> could you speak to the specific case of function signatures ?
> I saw nothing in CodingStyle specifically about this.
> (I skimmed, and grepped for signature)
> 
> forex:
> 
> static ssize_t
> store_fan_div (struct device *dev, struct device_attribute *devattr,
>                     const char *buf, size_t count)
> {...}
> 
> 
> IIRC, many like the entire sig on one line, because its grep friendly.
> I personally like the above, but grep-ability is hard to argue against.

(I expect that "you" above means Linus, but anyway...)

Some people like the above so that the function name can be grepped
using a "^store_fan_div" regex, but that's not good enough reason
for it for others, including Linus, IIRC.  We have other tools
to find where functions are.

> The above has 2 violations (of strict-grep-ability rule)
> 1 - return sig is separate
> 2 - arg-list is split

#2 can't be helped unless someone is willing to go way beyond the
80-or-so column limit.

I would write that function sig like so:

static ssize_t store_fan_div(struct device *dev,
			struct device_attribute *devattr,
			const char *buf, size_t count)

Some people would add spaces on lines 2 & 3 so that all of the
function parameters are aligned.  I don't care very much one way
or the other about that.

---
~Randy
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