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Date:	Tue, 28 Aug 2007 16:48:44 +0200
From:	Michael Buesch <mb@...sch.de>
To:	David Miller <davem@...emloft.net>
Cc:	joe@...ches.com, johannes@...solutions.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-2.6.24] introduce MAC_FMT/MAC_ARG

On Monday 27 August 2007 23:11:50 David Miller wrote:
> From: Joe Perches <joe@...ches.com>
> Date: Mon, 27 Aug 2007 13:57:42 -0700
> 
> > On Mon, 2007-08-27 at 13:41 -0700, David Miller wrote:
> > > From: Johannes Berg <johannes@...solutions.net>
> > > Date: Mon, 27 Aug 2007 12:54:09 +0200
> > > > #define MAC_FMT "%s"
> > > > #define MAC_ARG(a) ({char __buf[18]; print_mac(a, __buf); __buf;})
> > 
> > > I don't think this works.
> > 
> > $ cat test_fmt.c
> > #include <stdio.h>
> > #include <stdlib.h>
> 
> You're just getting lucky in this test case.
> 
> The language does not allow what you are doing, so you're
> playing with fire.

What exactly to you think it invalid in this code?
I think it's fine (except that I'd chose an u8* for the mac
address (first arg in print_mac()).

-- 
Greetings Michael.
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