linux-kernel - [116/151] tracing: Fix event format export

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Message-Id: <20091217035658.016283887@mini.kroah.org>
Date:	Wed, 16 Dec 2009 19:56:53 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Johannes Berg <johannes@...solutions.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: [116/151] tracing: Fix event format export

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Johannes Berg <johannes@...solutions.net>

commit 811cb50baf63461ce0bdb234927046131fc7fa8b upstream.

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.

For example, in net/mac80211/driver-trace.h for the trace event drv_start
there is:

        TP_printk(
                LOCAL_PR_FMT, LOCAL_PR_ARG
        )

Which use to produce:

 print fmt: LOCAL_PR_FMT, REC->wiphy_name

Now produces:

 print fmt: "%s", REC->wiphy_name

Signed-off-by: Johannes Berg <johannes@...solutions.net>
LKML-Reference: <20091113224009.GB23942@...e.hu>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 include/trace/ftrace.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -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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