linux-kernel - Re: [PATCH] printk: allow setting DEFAULT_MESSAGE

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Date:	Wed, 26 Jan 2011 15:05:48 -0800
From:	Mandeep Baines <msb@...gle.com>
To:	WANG Cong <xiyou.wangcong@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] printk: allow setting DEFAULT_MESSAGE_LEVEL via Kconfig

On Tue, Jan 25, 2011 at 8:18 PM, WANG Cong <xiyou.wangcong@...il.com> wrote:
>
> On Tue, 25 Jan 2011 15:57:00 -0800, Mandeep Singh Baines wrote:
>
> > We've been burned by regressions/bugs which we later realized could have
> > been triaged quicker if only we'd paid closer attention to dmesg. To
> > make it easier to audit dmesg, we'd like to make DEFAULT_MESSAGE_LEVEL
> > Kconfig-settable. That way we can set it to KERN_NOTICE and audit any
> > messages <= KERN_WARNING.
> >
>
> Why? We already have "loglevel=" kernel parameter.
>

loglevel allows you to control which messages go to the console.

DEFAULT_MESSAGE_LEVEL selects the default message levels for printk()s which
don't specify a message level.

Most printks()s without a message level aren't really warnings and
just create noise
if you're trying to look closely at all warnings. Some of this is just
old code but new
printk()s without a message level do get committed from time to time.

>
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