linux-kernel - [PATCH 4/4] tracing: avoid warnings from zero-arg tracepoints

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Date:	Thu, 16 Apr 2009 23:35:39 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	mathieu.desnoyers@...ymtl.ca
Cc:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 4/4] tracing: avoid warnings from zero-arg tracepoints

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

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.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 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;							\
 									\
-- 
1.6.0.6

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