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

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Date:	Thu, 7 Aug 2008 10:01:44 -0700
From:	Greg KH <gregkh@...e.de>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	Kay Sievers <kay.sievers@...y.org>, 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>,
	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 Thu, Aug 07, 2008 at 10:31:41AM +0200, Martin Schwidefsky wrote:
> On Wed, 2008-08-06 at 13:07 -0700, Greg KH wrote:
> > > > > Using dev_printk won't work because of the order of the elements of the
> > > > > printk. The kmsg tag should not have a "random" position in the printk
> > > > > but should be the first element. If we use dev_printk the kmsg tag will
> > > > > be the third element, for other kmsg printks it will be the first. In
> > > > > addition the kmsg message tag for the device drivers already includes
> > > > > the driver name ..
> > > > 
> > > > But the structure of dev_printk() is well definied and should be pretty
> > > > trival to parse even with missing fields.
> > > 
> > > The missing field is the message tag. Which is the key for the message
> > > lookup. As far as the kmsg catalog is concerned this is a pretty
> > > important field that may not be missing from the printk itself.
> > 
> > No, I mean use dev_printk() as the base for your logging macro.  Add
> > your message tag as the first field after the dev_printk() information.
> 
> Hmm, you are proposing to introduce a second format for the kmsg
> messages to avoid the need for some more printk wrapper macros. To me it
> seems that this has two problems:

No, only 1 format, use dev_printk() instead of printk() in your macro.

> 1) The message tag is for the user of the system. If it does not have a
> fixed position it gets confusing.

How would it not be in a fixed position with dev_printk()?

> 2) The message tag for a driver message usually already includes the
> driver name, the dev_printk will print it again. This is ugly and
> reduces the quality of the message.

Then the message needs to change and remove that "driver name", as it is
redundant, saving a tiny ammount of space :)

thanks,

greg k-h
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