linux-kernel - Re: [PATCH] printk: add Kconfig for default console loglevel

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Date:	Tue, 26 Jul 2011 10:16:00 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Joe Perches <joe@...ches.com>
Cc:	Dave Reisner <d@...conindy.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Dave Reisner <dreisner@...hlinux.org>
Subject: Re: [PATCH] printk: add Kconfig for default console loglevel

On Tue, 26 Jul 2011 10:01:45 -0700 Joe Perches wrote:

> On Tue, 2011-07-26 at 09:37 -0700, Randy Dunlap wrote:
> > On Tue, 26 Jul 2011 11:33:51 -0400 Dave Reisner wrote:
> > > Keep the historical default of 7, but allow distributions and users to
> > > tune this value instead of requiring a kernel cmdline parameter.
> > Please explain how this is different from what is already in lib/Kconfig.debug:
> > config DEFAULT_MESSAGE_LOGLEVEL
> > 	int "Default message log level (1-7)"
> > 	range 1 7
> > 	default "4"
> > 	help
> > 	  Default log level for printk statements with no specified priority.
> 
> DEFAULT_MESSAGE_LOGLEVEL sets a KERN_<level> for
> printks without a KERN_<level>.
> 
> > > +config DEFAULT_CONSOLE_LOGLEVEL
> > > +	int "Default console log level (1-7)"
> > > +	range 1 7
> > > +	default "7"
> > > +	help
> > > +	  Default console log level setting for printk statements.
> > > +
> > > +	  This was hard-coded to KERN_INFO (7) since at least 2.6.12. You may
> > > +	  wish to turn this down to 4 for a quieter console.
> > > +
> 
> This allows 'unimportant' messages to not be shown by default.

Thanks.  Maybe Kconfig help text could be clearer.

> I think there are lots of KERN_INFO messages that are
> miscategorized.  This change might cause some shifting
> of KERN_<level>s in the future, so it's OK by me. 


---
~Randy
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