linux-kernel - Re: [PATCH 2/2] printk: Remember the message level for multi-line output

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Message-ID: <20080414110316.GJ29599@tull.net>
Date:	Mon, 14 Apr 2008 21:03:16 +1000
From:	Nick Andrew <nick@...k-andrew.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, joe@...ches.com
Subject: Re: [PATCH 2/2] printk: Remember the message level for multi-line	output

On Mon, Apr 14, 2008 at 12:26:34PM +0200, Ingo Molnar wrote:
> * Nick Andrew <nick@...k-andrew.net> wrote:
> > Yes, quite. The state of whether we're inside a line is retained 
> > across calls to printk (from anywhere in the system) - this allows 
> > code like this to usually do what you expect:
> > 
> > 	printk(KERN_ERR "Error:");
> > 	for (i = 0; i < 16; ++i) {
> > 		printk("  %02x", i);
> > 	}
> > 	printk("\n");
> > 
> > But in your example the first printk call contains a \n at the end of 
> > the line and so upon entry to the second printk call the function 
> > knows a new line is beginning.
> 
> ok - i think your change is a good one.

Thank you.

> btw., we could also start emitting debug warnings that the printk is not 
> conform. Something like:
> 
>   "INFO: the previous printk was done without a KERN_ annotation"

There are 20k+ instances of this in the codebase; we don't need a
runtime message to find them. If you annotate them all, that will
add up to 60k to the binary size. Perhaps it's best to retain the
default support.

Nick.
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