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

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Date:	Tue, 26 Jul 2011 09:37:30 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Dave Reisner <d@...conindy.com>
Cc:	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 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.

Hi,

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.


> Signed-off-by: Dave Reisner <dreisner@...hlinux.org>
> ---
>  kernel/printk.c   |    4 +++-
>  lib/Kconfig.debug |   10 ++++++++++
>  2 files changed, 13 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/printk.c b/kernel/printk.c
> index 37dff34..fabc216 100644
> --- a/kernel/printk.c
> +++ b/kernel/printk.c
> @@ -58,7 +58,9 @@ void asmlinkage __attribute__((weak)) early_printk(const char *fmt, ...)
>  
>  /* We show everything that is MORE important than this.. */
>  #define MINIMUM_CONSOLE_LOGLEVEL 1 /* Minimum loglevel we let people use */
> -#define DEFAULT_CONSOLE_LOGLEVEL 7 /* anything MORE serious than KERN_DEBUG */
> +
> +/* default to 7 -- anything MORE serious than KERN_DEBUG */
> +#define DEFAULT_CONSOLE_LOGLEVEL CONFIG_DEFAULT_CONSOLE_LOGLEVEL
>  
>  DECLARE_WAIT_QUEUE_HEAD(log_wait);
>  
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index c0cb9c4..6caa66e 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -21,6 +21,16 @@ config DEFAULT_MESSAGE_LOGLEVEL
>  	  that are auditing their logs closely may want to set it to a lower
>  	  priority.
>  
> +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.
> +
>  config ENABLE_WARN_DEPRECATED
>  	bool "Enable __deprecated logic"
>  	default y
> -- 


---
~Randy
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