ftrace: enabled tracing by default

This patch is the correct way to have tracing enabled by default.
Signed-off-by: NSteven Rostedt <srostedt@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

kernel/trace/trace.c

@@ -107,7 +107,7 @@ static struct trace_array	max_tr;
 
 static DEFINE_PER_CPU(struct trace_array_cpu, max_data);
 
-static int			tracer_enabled;
+static int			tracer_enabled = 1;
 static unsigned long		trace_nr_entries = 16384UL;
 
 static struct tracer		*trace_types __read_mostly;
@@ -2268,6 +2268,8 @@ __init static int tracer_alloc_buffers(void)
 	int ret = -ENOMEM;
 	int i;
 
+	global_trace.ctrl = tracer_enabled;
+
 	/* Allocate the first page for all buffers */
 	for_each_possible_cpu(i) {
 		data = global_trace.data[i] = &per_cpu(global_trace_cpu, i);