linux-kernel - Re: [PATCH v3 0/4] Introduce the latent

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Date:	Wed, 15 Jun 2016 16:01:49 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Emese Revfy <re.emese@...il.com>,
	Greg KH <gregkh@...uxfoundation.org>
Cc:	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	PaX Team <pageexec@...email.hu>,
	Brad Spengler <spender@...ecurity.net>,
	Michal Marek <mmarek@...e.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>, Jens Axboe <axboe@...nel.dk>,
	Al Viro <viro@...iv.linux.org.uk>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	bart.vanassche@...disk.com, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3 0/4] Introduce the latent_entropy gcc plugin

On Wed, Jun 15, 2016 at 1:39 PM, Emese Revfy <re.emese@...il.com> wrote:
> On Wed, 15 Jun 2016 11:55:44 -0700
> Kees Cook <keescook@...omium.org> wrote:
>
>>  The limit on the length of lines is 80 columns and this is a strongly
>>  preferred limit.
>
> I think the code looks worse when it is truncated to 80 columns but
> I'll do it and resend the patches.

Yup, I understand your concerns, but since we're optimizing for
readability by a larger audience that has agreed to the guidelines in
CodingStyle, this is what we get. :)

One area I'm unclear on with kernel coding style, though, is if
splitting all the stuff prior to function name onto a separate line is
"acceptable", since that solves most of the long lines where
__latent_entropy has been added. For example, I don't know which is
better:

All on one line (gmail may split this, but my intention is all one line):

static __latent_entropy void rcu_process_callbacks(struct
softirq_action *unused)

Types and attributes on a separate line:

static __latent_entropy void
rcu_process_callbacks(struct softirq_action *unused)

All arguments on the next line:

static __latent_entropy void rcu_process_callbacks(
                                                          struct
softirq_action *unused)


Greg, do you have a better sense of how to split (or not split) these
kinds of long lines?

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security