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Subject[PATCH][GIT PULL][v2.6.32] tracing: Fix event format export


Please pull the latest tip/tracing/urgent tree, which can be found at:


Johannes Berg (1):
tracing: Fix event format export

include/trace/ftrace.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
commit 811cb50baf63461ce0bdb234927046131fc7fa8b
Author: Johannes Berg <>
Date: Fri Nov 13 23:40:09 2009 +0100

tracing: Fix event format export

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.

"\"%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:


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 <>
LKML-Reference: <>
Signed-off-by: Steven Rostedt <>

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index cc0d966..dacb8ef 100644
--- 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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