linux-kernel - Re: [RFC][PATCH] New message-logging API (kprint)

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Message-ID: <19f34abd0710080833q76ef905dr6e47a1ec780cf153@mail.gmail.com>
Date:	Mon, 8 Oct 2007 17:33:53 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Stephen Hemminger" <shemminger@...ux-foundation.org>
Cc:	"Rob Landley" <rob@...dley.net>,
	"Miguel Ojeda" <maxextreme@...il.com>,
	"Randy Dunlap" <randy.dunlap@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Kyle Moffett" <mrmacman_g4@....com>,
	"Michael Holzheu" <holzheu@...ux.vnet.ibm.com>,
	"Joe Perches" <joe@...ches.com>,
	"Dick Streefland" <dick.streefland@...ium.nl>,
	"Geert Uytterhoeven" <Geert.Uytterhoeven@...ycom.com>,
	"Jesse Barnes" <jesse.barnes@...el.com>,
	"Arnd Bergmann" <arnd@...db.de>,
	"Jan Engelhardt" <jengelh@...putergmbh.de>,
	"Emil Medve" <Emilian.Medve@...escale.com>,
	"linux@...izon.com" <linux@...izon.com>
Subject: Re: [RFC][PATCH] New message-logging API (kprint)

On 10/8/07, Stephen Hemminger <shemminger@...ux-foundation.org> wrote:
> On Sun, 7 Oct 2007 16:50:49 -0500
> Rob Landley <rob@...dley.net> wrote:
>
> > On Saturday 06 October 2007 1:10:26 am Vegard Nossum wrote:
> > > On 10/5/07, Rob Landley <rob@...dley.net> wrote:
> > I made it about halfway through the patch and the only compile time filtering
> > I found was:
> >
> > --- a/drivers/md/md.c
> > +++ b/drivers/md/md.c
> > @@ -62,7 +62,10 @@
> > #define MdpMinorShift 6
> >
> > #define DEBUG 0
> > -#define dprintk(x...) ((void)(DEBUG && printk(x)))
> > +#define dprintk(x...)\
> > +if(DEBUG) {\
> > + printk(x);\
> > +}
> >
> > If you say it does, I'll take your word for it, but there's so much churn in
> > there I didn't find it before my interest ran out...
> >
>
> BTW that change might actually break code (dangling else problems).
> The original way was safer.

Yep, thanks. I think containing it in do {} while(0) should fix, though, no?

Vegard
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