linux-kernel - Re: checkpatch guide for newbies

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Date:	Thu, 26 Sep 2013 05:27:15 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Peter Senna Tschudin <peter.senna@...il.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	kernel-janitors@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: checkpatch guide for newbies

Am 26.09.2013 05:04, schrieb Al Viro:
> On Thu, Sep 26, 2013 at 04:57:32AM +0200, Alexander Holler wrote:
>> Am 26.09.2013 04:52, schrieb Alexander Holler:
>>
>>> I'm aware of people which do nest 8 levels deep just to avoid a return,
>>> break or goto.
>>>
>>> But trying to limit that by limiting the line length is like ...
>>> (choose your own own misguided comparison, it's too late for me I
>>> currently only meorize some of those which don't make sense in english)
>>
>> But I'm still able to offer a solution: ;)
>>
>> limit the number of tabs, not the line length (at least not to 80).
>
> With that limited (and it's visually harder to keep track of), what's
> the problem with 80-column limit on line length?  Just how long do
> you want those "descriptive names" to be?

Oh, personally I don't have any limit there. ;) I like descriptive 
function and variable names whenever they make sense. And often they 
make comments uneccessary and therefor prevent errors because those 
descriptive names are visible whenever the function or variable is used, 
and comments usually appear only once and get forgotten when scrolled 
out of the screen.

But just take a function like

void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
                                 struct timespec *wtom, struct timespec 
*sleep);

I like such function names ;) (ok I wouldn't have use those and), but 
it's hard to press this into 80 characters, especially when the 
arguments should have some meaning too (e.g. what does wtom stand for?)

If you use that somewhere you get

         get_xtime_and_monotonic_and_sleep_offset(a, b, c)

using silly names and that already is a 58 characters long. So only 22 
are left to distribute over 3 variable names. And now think what happens 
if that wouldn't be a void function.

Regards,

Alexander Holler

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