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

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Date:	Tue, 5 Aug 2008 15:31:17 -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, Jul 31, 2008 at 11:10:04AM +0200, Martin Schwidefsky wrote:
> On Wed, 2008-07-30 at 15:04 -0700, Greg KH wrote:
> > On Thu, Jul 31, 2008 at 12:02:04AM +0200, Kay Sievers wrote:
> > > On Wed, Jul 30, 2008 at 18:56, Martin Schwidefsky
> > > <schwidefsky@...ibm.com> wrote:
> > > 
> > > > +#define kmsg_dev_alert(id, dev, format, arg...) \
> > > > +       printk(__KMSG_CHECK(ALERT, id) KMSG_COMPONENT \
> > > > +               ": %s: " format, (dev)->bus_id , ## arg)
> > > 
> > > Care to use dev_name(), bus_id will be removed soon.
> > 
> > Hm, just use dev_printk() instead, it handles all of these kinds of
> > changes automatically.
> 
> 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.

And if not, fix up dev_printk() to properly delinate when we have
missing fields, why create a totally new thing here that we need to
convert subsystems into?

thanks,

greg k-h
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