linux-kernel - [PATCH] tracing: Fix double CPP substitution in TRACE_EVENT

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Message-Id: <1251413406-6704-1-git-send-email-fweisbec@gmail.com>
Date:	Fri, 28 Aug 2009 00:50:06 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Josh Stone <jistone@...hat.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Jason Baron <jbaron@...hat.com>
Subject: [PATCH] tracing: Fix double CPP substitution in TRACE_EVENT_FN

TRACE_EVENT_FN relays on TRACE_EVENT by reprocessing its parameters
into the ftrace events CPP macro. This leads to a double substitution
in some cases.

For example, a bad consequence is a format always prefixed by
"%s, %s\n" for every TRACE_EVENT_FN based events.

Eg:
	cat /debug/tracing/events/syscalls/sys_enter/format
	[...]
	print fmt: "%s, %s\n", "\"NR %ld (%lx, %lx, %lx, %lx, %lx, %lx)\"",\
	"REC->id, REC->args[0], REC->args[1], REC->args[2], REC->args[3],\
	REC->args[4], REC->args[5]"

This creates a failure in post-processing tools such as perf trace or
trace-cmd.

Then drop this double substitution and replace it by a new __cpparg()
macro that relays CPP arguments containing commas.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Josh Stone <jistone@...hat.com>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: Steven Rostedt <srostedt@...hat.com>
Cc: Jason Baron <jbaron@...hat.com>
---
 include/trace/ftrace.h |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 360a77a..57c56a9 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -45,14 +45,15 @@
 	};							\
 	static struct ftrace_event_call event_##name
 
+#undef __cpparg
+#define __cpparg(arg...) arg
+
 /* Callbacks are meaningless to ftrace. */
 #undef TRACE_EVENT_FN
-#define TRACE_EVENT_FN(name, proto, args, tstruct,		\
-		assign, print, reg, unreg)			\
-	TRACE_EVENT(name, TP_PROTO(proto), TP_ARGS(args),	\
-		TP_STRUCT__entry(tstruct),			\
-		TP_fast_assign(assign),				\
-		TP_printk(print))
+#define TRACE_EVENT_FN(name, proto, args, tstruct,			\
+		assign, print, reg, unreg)				\
+	TRACE_EVENT(name, __cpparg(proto), __cpparg(args),		\
+		__cpparg(tstruct), __cpparg(assign), __cpparg(print))	\
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
-- 
1.6.2.3

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