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

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Message-ID: <1311651932.24377.15.camel@Joe-Laptop>
Date:	Mon, 25 Jul 2011 20:45:32 -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.
[]
> -		__dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);\
> +		__dynamic_pr_debug(&descriptor, fmt, ##__VA_ARGS__);	\

Hey Jim.

Thinking about a bit more, maybe it's possible to use
another test to see if the current pr_fmt is:

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

and not add pr_fmt when appropriate.

I tried this once.  I recall it worked without adding any
new string dependencies.   It did depend on __builtin_strcmp.

+#define _first_macro_arg(arg1, args...) arg1
+#define first_macro_arg(arg1, args...) _first_macro_arg(arg1)
+
+#define define_kernel_printk_level(level, fmt, ...)                    \
+do {                                                                   \
+       if (__builtin_strcmp(first_macro_arg(pr_fmt(fmt)),              \
+                            KBUILD_MODNAME ": " fmt))                  \
+               printk(level pr_fmt(fmt), ##__VA_ARGS__);               \
+       else                                                            \
+               printk(level fmt, ##__VA_ARGS__);                       \
+} while (0)



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