linux-kernel - Re: [RFC] Recursive printk

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Message-ID: <20081206193541.GQ28946@ZenIV.linux.org.uk>
Date:	Sat, 6 Dec 2008 19:35:41 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Nick Andrew <nick@...k-andrew.net>
Cc:	Joe Perches <joe@...ches.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Takashi Iwai <tiwai@...e.de>
Subject: Re: [RFC] Recursive printk

On Sat, Dec 06, 2008 at 07:40:38PM +1100, Nick Andrew wrote:

> The basic problem is that subsystems want to prepend or append their
> own data to kernel messages generated by subsystem code, and they
> both want to use printf-type strings. How to combine them into a
> single kernel log message without using extra memory, or double
> handling of strings?

The basic problem with your approach is that printk interpretation of
arguments becomes dependent on more than its first (and hopefully
an explicit constant) argument.
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