linux-kernel - Re: [PATCH] i2c: add missing KERN

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Message-ID: <20090207105219.GA12371@strlen.de>
Date:	Sat, 7 Feb 2009 11:52:19 +0100
From:	Uwe Kleine-König <ukleinek@...len.de>
To:	Frank Seidel <fseidel@...e.de>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, ben-linux@...ff.org,
	linux-i2c@...r.kernel.org, frank@...eidel.de,
	w.sang@...gutronix.de, "David S. Miller" <davem@...emloft.net>,
	Frans Pop <elendil@...net.nl>,
	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Subject: Re: [PATCH] i2c: add missing KERN_* constants to printks

On Sat, Feb 07, 2009 at 11:37:48AM +0100, Frank Seidel wrote:
> Jean Delvare wrote:
> > Default log level? That's news to me. Care to elaborate?
> 
> printk (in kernel/printk.c) uses vprintk and vprintk:
> asmlinkage int vprintk(const char *fmt, va_list args)
> {
>         int printed_len = 0;
>         int current_log_level = default_message_loglevel;
> ...
> and default_message_loglevel in include/linux/kernel.h:
> 
> #define default_message_loglevel (console_printk[1])
> 
> and console_printk[1] is (in kernel/printk.c)
> DEFAULT_MESSAGE_LOGLEVEL
> 
> and in kernel/printk.c:
> #define DEFAULT_MESSAGE_LOGLEVEL 4 /* KERN_WARNING */
> 
> => so as far as i could see KERN_WARNING is the
> default loglevel of messages.
one little note:  This is changable writing to /proc/sys/kernel/printk.

So the patch introduces at least a little change in behaviour.
IMHO this is OK though.

Best regards
Uwe
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