linux-kernel - Re: printk regression?

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Date:	Thu, 02 Jul 2009 08:29:16 -0700
From:	Joe Perches <joe@...ches.com>
To:	lkml@...ethan.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: printk regression?

On Thu, 2009-07-02 at 07:29 -0500, Michael S. Zick wrote:
> On Thu July 2 2009, Joe Perches wrote:
> > On Wed, 2009-07-01 at 21:23 -0700, Linus Torvalds wrote:
> > > On Wed, 1 Jul 2009, Yinghai Lu wrote:
> > > > [   75.690022] <7>printing local APIC contents on CPU#0/0:
> > > Yes. This is because the io_apic code should be fixed.
> > > It does:
> > > 	printk("\n" KERN_DEBUG "printing local APIC
> > > and that "\n" at the beginning should just be deleted. The log-level 
> > > should be at the beginning of the printk, not in the middle.
> > There's at least 72 of them:
> > $ grep -Pr --include=*.[ch] "\bprintk.*\\\n.*KERN_" *
> That should qualify it as a documented feature.  ;)
> "To convert the log level marker into visible garbage, do..."

Before some changes to the printk code, that used to
be the only way to get a single printk call with multiple
line output to have a KERN_<level> on all output lines.

ie:	printk(KERN_INFO "Line 1\n" KERN_INFO "Line 2\n");

That style doesn't show up in the grep I posted because most
of them look like:

	printk(KERN_INFO "Line 1\n"
	       KERN_INFO "Line 2\n");

An example:  here's a bit of kernel/module.c:

		printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, "
				    "it should follow 0/-E convention\n"
		       KERN_WARNING "%s: loading module anyway...\n",



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