linux-kernel - Re: [patch 1/6] kmsg: tagged kernel messages.

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Date:	Mon, 29 Sep 2008 10:35:00 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	schwidefsky@...ibm.com, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org,
	lf_kernel_messages@...ts.linux-foundation.org,
	Greg KH <gregkh@...e.de>, Kay Sievers <kay.sievers@...y.org>,
	Joe Perches <joe@...ches.com>, Tim Hockin <thockin@...kin.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Holzheu <holzheu@...ibm.com>,
	Gerrit Huizenga <gh@...ibm.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Jan Kara <jack@...e.cz>, Pavel Machek <pavel@....cz>,
	Sam Ravnborg <sam@...nborg.org>,
	Jochen Voß <jochen.voss@...glemail.com>,
	Kunai Takashi <kunai@...ux-foundation.jp>,
	Tim Bird <tim.bird@...sony.com>, Jan Blunck <jblunck@...e.de>,
	Rick Troth <rmt@...ita.net>, Utz Bacher <utz.bacher@...ibm.com>
Subject: Re: [patch 1/6] kmsg: tagged kernel messages.

Am Sonntag, 28. September 2008 schrieb Rusty Russell:
> On Sunday 28 September 2008 09:16:40 Martin Schwidefsky wrote:
> > On Sat, 2008-09-27 at 17:15 +1000, Rusty Russell wrote:
> > > It's hard for authors (eg. me) to know which level to use.  As a result,
> > > levels currently seem to be chosen randomly.
> > >
> > > If you felt inspired to rationalize them, it would let us clean that up
> > > as things moved to kmsg :)
> >
> > Urgs, you are after a sort of definition what the differences is between
> > a warning, an error, an alert, etc is, aren't you?
> 

Rusty,

Since Kernel message levels are used directly by syslog, the Open Group Base 
Specifications Issue 6 defines what these levels are:
http://www.opengroup.org/onlinepubs/009695399/basedefs/syslog.h.html

LOG_EMERG
A panic condition was reported to all processes.
LOG_ALERT
A condition that should be corrected immediately.
LOG_CRIT
A critical condition.
LOG_ERR
An error message.
LOG_WARNING
A warning message.
LOG_NOTICE
A condition requiring special handling.
LOG_INFO
A general information message.
LOG_DEBUG
A message useful for debugging programs.

I dont think, that the kernel should define anything different.
We could add a more verbose description or a howto to CodingStyle later on, 
but this is really orthogonal to kmsg and would be valid for printk, 
dev_printk and any other printk wrapper.

Futhermore, this really smells like a bike shed color question and IMHO we 
should not hold of the kmsg patches to answer this kind of controversial 
questions ;-)

Christian 
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