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

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Message-Id: <200710071650.50627.rob@landley.net>
Date:	Sun, 7 Oct 2007 16:50:49 -0500
From:	Rob Landley <rob@...dley.net>
To:	"Vegard Nossum" <vegard.nossum@...il.com>
Cc:	"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>,
	"Stephen Hemminger" <shemminger@...ux-foundation.org>,
	"linux@...izon.com" <linux@...izon.com>
Subject: Re: [RFC][PATCH] New message-logging API (kprint)

On Saturday 06 October 2007 1:10:26 am Vegard Nossum wrote:
> On 10/5/07, Rob Landley <rob@...dley.net> wrote:
> > The original idea (selectively compile out printk() instances based on
> > log level to conserve space) is explicitly not addressed by this patch,
> > and in fact this patch might actually make it harder to implement (by
> > complicating the code).
>
> This is wrong. The patch provides log-level-based filtering at compile
> time, effectively making the kernel smaller.

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...

Rob
-- 
"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.
-
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