linux-kernel - Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer

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Date:	Thu, 10 May 2012 17:13:19 -0700
From:	Joe Perches <joe@...ches.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kay Sievers <kay@...y.org>, Ted Ts'o <tytso@....edu>,
	Ingo Molnar <mingo@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Sasha Levin <levinsasha928@...il.com>,
	Greg Kroah-Hartmann <greg@...ah.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 1/3] printk: convert byte-buffer to
 variable-length record buffer

On Thu, 2012-05-10 at 14:58 -0700, Linus Torvalds wrote:
> On Thu, May 10, 2012 at 2:11 PM, Joe Perches <joe@...ches.com> wrote:
> >
> > I think it's a distinction without a difference for,
> > as fas as I know, that's a case that doesn't exist
> > in the current kernel.
> 
> So? Even if we hadn't had this bug before (we have),

True.  I've fixed the ones you've introduced when you
changed printk semantics in the past.

> your argument is utter crap.

What happened to the pragmatic Linus Torvalds?
Did the dogmatic one replace him again temporarily?

> Even if we weren't to have that patter right *now*, that
> doesn't mean that it cannot happen.

Not what I said.

> Your grep is also not at all exhaustive.

I believe I know the printk subsystem and its uses
as well as anyone.  I don't think there is a case
today.

> We do need an escape model.

Or an agreement to not to emit "<[0-7cd]>"
as the first 3 bytes after a newline or as
the start of a new printk.  It could just
as easily be an escape is a required leading
non "<" character.

I think that's not onerous.

> The current KERN_CONT does that. Stop
> arguing for crap.

Correctness in all cases can be a good thing.
Simplicity may be better because complexity
is reduced.

cheers, Joe

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