linux-kernel - Re: [PATCH 2.6.32] ftrace: fix event format export

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Date:	Fri, 13 Nov 2009 23:40:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Johannes Berg <johannes@...solutions.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2.6.32] ftrace: fix event format export


( extended the Cc:s. Please try to Cc: people you think would be 
  interested in your patches. )

* Johannes Berg <johannes@...solutions.net> wrote:

> For some reason the export of the event print
> format to userspace uses '#fmt' which breaks
> if the format string is anything but a plain
> string, for example if it is built with macros
> then the macro names are exported instead of
> their contents.
> 
> Use
> 	"\"%s\"", fmt
> instead of
> 	"%s", #fmt
> to export the string and not the way it is built.
> 
> Signed-off-by: Johannes Berg <johannes@...solutions.net>
> ---
> This is making the export of a bunch of events (only checked the
> wireless ones but those are all affected) unusable, so please apply to
> 2.6.32.
> 
>  include/trace/ftrace.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- wireless-testing.orig/include/trace/ftrace.h	2009-11-13 13:15:21.000000000 +0100
> +++ wireless-testing/include/trace/ftrace.h	2009-11-13 13:34:03.000000000 +0100
> @@ -159,7 +159,7 @@
>  #undef __get_str
>  
>  #undef TP_printk
> -#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
> +#define TP_printk(fmt, args...) "\"%s\", %s\n", fmt, __stringify(args)
>  
>  #undef TP_fast_assign
>  #define TP_fast_assign(args...) args
> 
> 
> --
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