linux-kernel - [for-next][PATCH 01/20] tracing: Consolidate updating of count for traceon/off

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Date:	Fri, 15 Mar 2013 15:39:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [for-next][PATCH 01/20] tracing: Consolidate updating of count for traceon/off

From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>

Remove some duplicate code and replace it with a helper function.
This makes the code a it cleaner.

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/trace/trace_functions.c |   33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index e467c0c..38cfb29 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -214,38 +214,37 @@ static struct tracer function_trace __read_mostly =
 };
 
 #ifdef CONFIG_DYNAMIC_FTRACE
-static void
-ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
+static int update_count(void **data)
 {
-	long *count = (long *)data;
-
-	if (tracing_is_on())
-		return;
+	unsigned long *count = (long *)data;
 
 	if (!*count)
-		return;
+		return 0;
 
 	if (*count != -1)
 		(*count)--;
 
-	tracing_on();
+	return 1;
 }
 
 static void
-ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
+ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
 {
-	long *count = (long *)data;
-
-	if (!tracing_is_on())
+	if (tracing_is_on())
 		return;
 
-	if (!*count)
-		return;
+	if (update_count(data))
+		tracing_on();
+}
 
-	if (*count != -1)
-		(*count)--;
+static void
+ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
+{
+	if (!tracing_is_on())
+		return;
 
-	tracing_off();
+	if (update_count(data))
+		tracing_off();
 }
 
 static int
-- 
1.7.10.4



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