tracing: Remove unused function unregister_tracer()

The function register_tracer() is only used by kernel core code,
that never needs to remove the tracer. As trace_events have become
the main way to add new tracing to the kernel, the need to
unregister a tracer has diminished. Remove the unused function
unregister_tracer(). If a need arises where we need it, then we
can always add it back.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6ed6013..d1d8039 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -882,32 +882,6 @@ int register_tracer(struct tracer *type)
        return ret;
 }
 
-void unregister_tracer(struct tracer *type)
-{
-       struct tracer **t;
-
-       mutex_lock(&trace_types_lock);
-       for (t = &trace_types; *t; t = &(*t)->next) {
-               if (*t == type)
-                       goto found;
-       }
-       pr_info("Tracer %s not registered\n", type->name);
-       goto out;
-
- found:
-       *t = (*t)->next;
-
-       if (type == current_trace && tracer_enabled) {
-               tracer_enabled = 0;
-               tracing_stop();
-               if (current_trace->stop)
-                       current_trace->stop(&global_trace);
-               current_trace = &nop_trace;
-       }
-out:
-       mutex_unlock(&trace_types_lock);
-}
-
 void tracing_reset(struct trace_array *tr, int cpu)
 {
        struct ring_buffer *buffer = tr->buffer;

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 839ae00..3e8a176 100644 (file)
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -410,7 +410,6 @@ void tracing_sched_switch_assign_trace(struct trace_array *tr);
 void tracing_stop_sched_switch_record(void);
 void tracing_start_sched_switch_record(void);
 int register_tracer(struct tracer *type);
-void unregister_tracer(struct tracer *type);
 int is_tracing_stopped(void);
 enum trace_file_type {
        TRACE_FILE_LAT_FMT      = 1,