linux-kernel - Re: [RFC] New kernel-message logging API (take 2)

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Date:	Fri, 28 Sep 2007 14:11:03 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	"Kyle Moffett" <mrmacman_g4@....com>,
	"Michael Holzheu" <holzheu@...ux.vnet.ibm.com>,
	"Joe Perches" <joe@...ches.com>, "Rob Landley" <rob@...dley.net>,
	"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] New kernel-message logging API (take 2)

On 9/27/07, Vegard Nossum <vegard.nossum@...il.com> wrote:
>   * Use SUBSYSTEM and KBUILD_MODNAME

snip.

> 2.1.5. Subsystem/driver tags
>
>   Many parts of the kernel already prefix their log messages with a
> subsystem and/or driver tag to identify the source of a particular
> message. With the kprint interface, these tags are redundant. Instead,
> the macros SUBSYSTEM and KBUILD_MODNAME are used and recorded along
> with each log message. Therefore, each source file should define the
> macro SUBSYSTEM before any of the kprint functions are used. If this
> macro is not defined, the recorded subsystem will be an empty string.
> [6][7]

This changes to KPRINT_SUBSYSTEM and KPRINT_DRIVER. The KPRINT_ prefix
is to clearly say that this is something related to logging. The
reason we can't use KBUILD_MODNAME is that this is defined on the
command line. The declaration inside the header would thus be horribly
wrong. We can, however, use KBUILD_MODNAME as a default value for
KPRINT_DRIVER, like:
static const char *KPRINT_DRIVER = KBUILD_MODNAME;
which would pre-process to something like:
static const char *KPRINT_DRIVER = "bcm43xx";

This value can still be overridden using #define KPRINT_DRIVER "new
name". In this case, it is possible that the original KPRINT_DRIVER
symbol can cause an "unused variable"-warning. I guess this is fixable
with the gcc "unused" variable attribute.

Vegard
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