ftrace: remove static from function tracer functions

Impact: clean up

After reorganizing the functions in trace.c and trace_function.c,
they no longer need to be in global context. This patch makes the
functions and one variable into static.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 61d0b73..b3a320f 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -16,8 +16,14 @@
 
 #include "trace.h"
 
+/* function tracing enabled */
+static int			ftrace_function_enabled;
+
 static struct trace_array	*func_trace;
 
+static void tracing_start_function_trace(void);
+static void tracing_stop_function_trace(void);
+
 static void start_function_trace(struct trace_array *tr)
 {
 	func_trace = tr;
@@ -177,7 +183,7 @@
 	.opts = func_opts
 };
 
-void tracing_start_function_trace(void)
+static void tracing_start_function_trace(void)
 {
 	ftrace_function_enabled = 0;
 
@@ -194,7 +200,7 @@
 	ftrace_function_enabled = 1;
 }
 
-void tracing_stop_function_trace(void)
+static void tracing_stop_function_trace(void)
 {
 	ftrace_function_enabled = 0;
 	/* OK if they are not registered */