linux-kernel - Re: [PATCH 05/50] Dynamic debug: Add more flags

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Date:	Thu, 17 Mar 2011 13:56:08 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>, rostedt@...dmis.org
Cc:	linux-kernel@...r.kernel.org, Bart Van Assche <bvanassche@....org>,
	Greg Banks <gnb@...h.org>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>, mingo@...e.hu,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 05/50] Dynamic debug: Add more flags

On Wed, Mar 16, 2011 at 02:10:43PM -0700, Greg Kroah-Hartman wrote:
> Add flags that allow the user to specify via debugfs whether or not the
> module name, function name, line number and/or thread ID have to be
> included in the printed message.
> 
> Signed-off-by: Bart Van Assche <bvanassche@....org>
> Cc: Greg Banks <gnb@...h.org>
> Cc: Konrad Rzeszutek Wilk <konrad@...nok.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> ---
>  Documentation/dynamic-debug-howto.txt |   12 +++++-
>  include/linux/dynamic_debug.h         |    8 ++++-
>  lib/dynamic_debug.c                   |   60 ++++++++++++++++++++++++++++-----
>  3 files changed, 68 insertions(+), 12 deletions(-)
> 
> diff --git a/Documentation/dynamic-debug-howto.txt b/Documentation/dynamic-debug-howto.txt
> index 58ea64a..e6c4b75 100644
> --- a/Documentation/dynamic-debug-howto.txt
> +++ b/Documentation/dynamic-debug-howto.txt
> @@ -205,12 +205,20 @@ of the characters:
>  
>  The flags are:
>  
> +f
> +    Include the function name in the printed message
> +l
> +    Include line number in the printed message
> +m
> +    Include module name in the printed message
>  p
>      Causes a printk() message to be emitted to dmesg
> +t
> +    Include thread ID in messages not generated from interrupt context
>  
> -Note the regexp ^[-+=][scp]+$ matches a flags specification.
> +Note the regexp ^[-+=][flmpt]+$ matches a flags specification.
>  Note also that there is no convenient syntax to remove all
> -the flags at once, you need to use "-psc".
> +the flags at once, you need to use "-flmpt".
>  
>  
>  Debug messages during boot process
> diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
> index 1c70028..0c9653f 100644
> --- a/include/linux/dynamic_debug.h
> +++ b/include/linux/dynamic_debug.h
> @@ -31,6 +31,10 @@ struct _ddebug {
>  	 * writes commands to <debugfs>/dynamic_debug/control
>  	 */
>  #define _DPRINTK_FLAGS_PRINT   (1<<0)  /* printk() a message using the format */
> +#define _DPRINTK_FLAGS_INCL_MODNAME	(1<<1)
> +#define _DPRINTK_FLAGS_INCL_FUNCNAME	(1<<2)
> +#define _DPRINTK_FLAGS_INCL_LINENO	(1<<3)
> +#define _DPRINTK_FLAGS_INCL_TID		(1<<4)
>  #define _DPRINTK_FLAGS_DEFAULT 0
>  	unsigned int flags:8;
>  	char enabled;
> @@ -42,6 +46,8 @@ int ddebug_add_module(struct _ddebug *tab, unsigned int n,
>  
>  #if defined(CONFIG_DYNAMIC_DEBUG)
>  extern int ddebug_remove_module(const char *mod_name);
> +extern int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
> +	__attribute__ ((format (printf, 2, 3)));
>  
>  #define dynamic_pr_debug(fmt, ...) do {					\
>  	static struct _ddebug descriptor				\
> @@ -50,7 +56,7 @@ extern int ddebug_remove_module(const char *mod_name);
>  	{ KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__,		\
>  		_DPRINTK_FLAGS_DEFAULT };				\
>  	if (unlikely(descriptor.enabled))				\
> -		printk(KERN_DEBUG pr_fmt(fmt),	##__VA_ARGS__);		\
> +		__dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \
>  	} while (0)
>  

This piece is going to conflict with the jump label update patches, I'm
trying to get into .39. The 'if (unlikely(descriptor.enabled))' bit is
now: 'if (DDEBUG_BRANCH(descriptor.enabled))'. So its a small conflict,
but they wouldn't merge together. So we need to adjust either one (and
make sure they're applied in the correct orer), or drop one.

thanks,

-Jason


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