linux-kernel - Re: [PATCH 24/25] dynamic_debug: drop pr_fmt() from dynamic_pr

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Date:	Mon, 25 Jul 2011 19:23:57 -0700
From:	Joe Perches <joe@...ches.com>
To:	Jim Cromie <jim.cromie@...il.com>
Cc:	jbaron@...hat.com, bvanassche@....org, gregkh@...e.de,
	linux-kernel@...r.kernel.org, gnb@...h.org
Subject: Re: [PATCH 24/25] dynamic_debug: drop pr_fmt() from
 dynamic_pr_debug

On Mon, 2011-07-25 at 15:42 -0600, Jim Cromie wrote:
> dynamic_pr_debug can add module, function, file, and line selectively,
> theres no need to also add them via macro.  Moreover, adding them
> via the macro, which is useful for pr_info and friends, causes
> pr_debug to double-print those fields added by the flag-settings.
[]
> diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
[]
> @@ -65,7 +65,7 @@ extern int __dynamic_netdev_dbg(struct _ddebug *descriptor,
>  #define dynamic_pr_debug(fmt, ...) do {					\
>  	DYNAMIC_DEBUG_METADATA(fmt);					\
>  	if (unlikely(descriptor.enabled))				\
> -		__dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);\
> +		__dynamic_pr_debug(&descriptor, fmt, ##__VA_ARGS__);	\

For me, NAK.

I think this isn't a good idea for now.
Maybe in a year or two after all the #define pr_fmt(foo)
are sorted out better.

This is a #define, that is used by all uses of pr_fmt/pr_debug.

This will have problems with uses of pr_fmt that are not
using KBUILD_MODNAME like all uses of:

#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

and those that use a specific fixed  string like:

#define pr_fmt(fmt) "foo: " fmt


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