[tip:tracing/core] tracing: avoid warnings from zero-arg tracepoints

[tip-bot for Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>]

Commit-ID:  76aa81118ddfbb3dc31533030cf3ec329dd067a6
Gitweb:     http://git.kernel.org/tip/76aa81118ddfbb3dc31533030cf3ec329dd067a6
Author:     Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
AuthorDate: Thu, 16 Apr 2009 23:35:39 -0700
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 17 Apr 2009 17:52:26 +0200

tracing: avoid warnings from zero-arg tracepoints

Tracepoints with no arguments can issue two warnings:

	"field" defined by not used
	"ret" is uninitialized in this function

Mark field as being OK to leave unused, and initialize ret.

[ Impact: fix false positive compiler warnings. ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: mathieu.desnoyers@polymtl.ca
LKML-Reference: <1239950139-1119-5-git-send-email-jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
 include/trace/ftrace.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 60c5323..39a3351 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -160,8 +160,8 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags)	\
 static int								\
 ftrace_format_##call(struct trace_seq *s)				\
 {									\
-	struct ftrace_raw_##call field;					\
-	int ret;							\
+	struct ftrace_raw_##call field __attribute__((unused));		\
+	int ret = 0;							\
 									\
 	tstruct;							\
 									\