linux-kernel - Re: [patch 1/3] kmsg: Kernel message catalog macros.

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Date:	Mon, 25 Aug 2008 17:56:30 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	lf_kernel_messages@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Holzheu <holzheu@...ibm.com>,
	Gerrit Huizenga <gh@...ibm.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Jan Kara <jack@...e.cz>, Pavel Machek <pavel@....cz>,
	Sam Ravnborg <sam@...nborg.org>, Joe Perches <joe@...ches.com>,
	Jochen Voß <jochen.voss@...glemail.com>,
	Kunai Takashi <kunai@...ux-foundation.jp>,
	Tim Bird <tim.bird@...sony.com>
Subject: Re: [patch 1/3] kmsg: Kernel message catalog macros.

On Wed, 2008-08-13 at 14:33 +1000, Rusty Russell wrote:
> On Thursday 31 July 2008 02:56:57 Martin Schwidefsky wrote:
> > From: Michael Holzheu <holzheu@...ibm.com>
> > From: Martin Schwidefsky <schwidefsky@...ibm.com>
> >
> > Introduce a new family of printk macros which prefixes each kmsg message
> > with a component name and allows to tag the printk with a message id.
> 
> Can you hash the format string to generate the id?  6 hex digits should be 
> enough, and your tool can check for clashes.  As it's bad form to have 
> identical strings for different semantics anyway, this seems to make sense.

If we go with hashes there is one more thing: kmsg(0, <string>)
The variant where we manually assign the message ids knows about the
"special" id 0. There is no documentation required for id 0 and none is
wanted. If we replace the manual ids with hashes this will get lost. You
could argue that a kmsg with id 0 is a normal printk so why not just use
printk? What is lost is the information that this printk has been found
to be not important enough to be documented.

-- 
blue skies,
  Martin.

"Reality continues to ruin my life." - Calvin.


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