[PATCH] ftrace: remove unused tracing_sched_switch_enabled

[Eugene Teo <eugeneteo@kernel.sg>]

tracing_sched_switch_enabled isn't used anywhere.

Signed-off-by: Eugene Teo <eugeneteo@kernel.sg>
---
 kernel/trace/trace.h              |    1 -
 kernel/trace/trace_sched_switch.c |    9 +--------
 2 files changed, 1 insertions(+), 9 deletions(-)

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index ac851b2..3173a93 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -138,7 +138,6 @@ void unregister_tracer(struct tracer *type);
 
 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 
-extern int tracing_sched_switch_enabled;
 extern unsigned long tracing_max_latency;
 extern unsigned long tracing_thresh;
 
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 412c226..c4e0134 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -16,7 +16,6 @@
 
 static struct trace_array	*ctx_trace;
 static int __read_mostly	tracer_enabled;
-int __read_mostly		tracing_sched_switch_enabled;
 
 static void notrace
 ctx_switch_func(struct task_struct *prev, struct task_struct *next)
@@ -114,12 +113,6 @@ __init static int init_sched_switch_trace(void)
 {
 	int ret;
 
-	ret = register_tracer(&sched_switch_trace);
-	if (ret)
-		return ret;
-
-	tracing_sched_switch_enabled = 1;
-
-	return ret;
+	return register_tracer(&sched_switch_trace);
 }
 device_initcall(init_sched_switch_trace);