linux-kernel - Re: [PATCH v2 5/7] vsprintf: reduce code size by avoiding extra check

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Date:	Mon, 2 Nov 2009 21:00:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Joe Perches <joe@...ches.com>,
	André Goddard Rosa <andre.goddard@...il.com>,
	laijs@...fujitsu.com, davem@...emloft.net,
	akpm@...ux-foundation.org, harvey.harrison@...il.com,
	linux list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/7] vsprintf: reduce code size by avoiding extra
	check


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Mon, Nov 02, 2009 at 08:36:23PM +0100, Ingo Molnar wrote:
> > 
> > * Frederic Weisbecker <fweisbec@...il.com> wrote:
> > 
> > > On Mon, Nov 02, 2009 at 10:29:43AM -0800, Joe Perches wrote:
> > > > On Mon, 2009-11-02 at 19:19 +0100, Frederic Weisbecker wrote:
> > > > > On Mon, Nov 02, 2009 at 03:26:36PM -0200, André Goddard Rosa wrote:
> > > > > > Subject: [PATCH v2 5/7] vsprintf: reduce code size by avoiding extra check
> > > > > >    text    data     bss     dec     hex filename
> > > > > >   15735       0       8   15743    3d7f lib/vsprintf.o-before
> > > > > >   15719       0       8   15727    3d6f lib/vsprintf.o-minus-double-check
> > > > > Please add a changelog in your patches, I mean something that
> > > > > explain your practical change.
> > > > 
> > > > Read the subject and try not to go overboard.
> > > > I think the changelog André provided is perfect.
> > > 
> > > 
> > > It took me some time yesterday to understand how 
> > > ip6_compressed_string() does its job, hence it took me some time to 
> > > ensure this patch is safe, hence this reaction for something that 
> > > didn't seem obvious to me at a first glance.
> > > 
> > > But you're right actually, the problem was more in my homework than in 
> > > the changelog.
> > 
> > Since you wrote the last iteration of that bit and you didnt find it 
> 
> 
> André wrote this patch, not me :)

i know - i mean you touched the vsprintf code last materially.

But i see that there's been this commit since then:

  8a27f7c: lib/vsprintf.c: Add "%pI6c" - print pointer as compressed ipv6 address

which introduced ip6_compressed_string().

	Ingo
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