linux-kernel - Re: [patch 2/6] kmsg: tagged device messages.

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Date:	Fri, 26 Sep 2008 10:57:45 -0700
From:	Greg KH <gregkh@...e.de>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	lf_kernel_messages@...ts.linux-foundation.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	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 2/6] kmsg: tagged device messages.

On Thu, Sep 25, 2008 at 06:28:29PM +0200, Martin Schwidefsky wrote:
> From: Martin Schwidefsky <schwidefsky@...ibm.com>
> From: Michael Holzheu <holzheu@...ibm.com>
> 
> Add CONFIG_MSG_IDS support to the dev_xxx printk family. The message
> tag for a device printk consists of the driver name and the 24 bit
> hash over the message text. The hash is included in the printed line
> if the KMSG_COMPONENT macro is defined and CONFIG_MSG_IDS=y. For
> source files that do not define KMSG_COMPONENT or CONFIG_MSG_IDS=n
> the dev_xxx printks use the old-style format. 
> 
> To make it possible for a script to extract the correct message tag
> for the dev_xxx printks the KMSG_COMPONENT and the driver name need to
> be identical for all dev_xxx printks in a source file. If a source file
> is supposed to be converted to use message tags and there are dev_xxx
> printks with driver names different to KMSG_COMPONENT these dev_xxx
> printks need to be replaced with kmsg_xxx printks. In praxis this
> should not be a problem since there are very few dev_xxx printks outside
> of driver code.
> 
> In addition to the KMSG_COMPONENT changes in include/linux/device.h the
> dev_xxx macros with variable arguments are converted from the gcc specific
> '## arg' to the C99 variant '##__VA_ARGS__'.
> 
> Signed-off-by: Michael Holzheu <holzheu@...ibm.com>
> Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>

Nice, thanks for reworking this.  Feel free to add:
	Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
here.

Note that you will get some merge errors with -next in device.h due to
the dynamic debug printk work that is in my tree and in -next as well.
But it should be simple to resolve.

thanks,

greg k-h
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