linux-kernel - Re: [PATCH] Make DEBUG take precedence over DYNAMIC_PRINTK

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Date:	Thu, 4 Dec 2008 09:42:56 -0500
From:	Jason Baron <jbaron@...hat.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Greg K-H <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Make DEBUG take precedence over DYNAMIC_PRINTK_DEBUG.

On Thu, Dec 04, 2008 at 01:51:13PM +0100, Cornelia Huck wrote:
> Statically defined DEBUG should take precedence over
> dynamically enabled debugging; otherwise adding DEBUG
> (like, for example, via CONFIG_DEBUG_KOBJECT) does not
> have the expected result of printing pr_debug() messages
> unconditionally.
> 
> Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
> ---
>  include/linux/kernel.h |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> --- linux-2.6.orig/include/linux/kernel.h
> +++ linux-2.6/include/linux/kernel.h
> @@ -338,13 +338,13 @@ static inline char *pack_hex_byte(char *
>          printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
>  
>  /* If you are writing a driver, please use dev_dbg instead */
> -#if defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
> +#if defined(DEBUG)
> +#define pr_debug(fmt, ...) \
> +	printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
> +#elif defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
>  #define pr_debug(fmt, ...) do { \
>  	dynamic_pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
>  	} while (0)
> -#elif defined(DEBUG)
> -#define pr_debug(fmt, ...) \
> -	printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
>  #else
>  #define pr_debug(fmt, ...) \
>  	({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })

looks good...if you want to also make the analogous change for
'dev_dbg()' in include/linux/device.h, I'll ack it.

thanks,

-Jason
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