tracing: Move tracing_set_filter_buffering() into trace_events_hist.c

The function tracing_set_filter_buffering() is only used in
trace_events_hist.c. Move it to that file and make it static.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://patch.msgid.link/20260206195936.617080218@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Author: rostedt

kernel/trace/trace.c

@@ -7891,26 +7891,6 @@ u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_eve
 	return ring_buffer_event_time_stamp(buffer, rbe);
 }
 
-/*
- * Set or disable using the per CPU trace_buffer_event when possible.
- */
-int tracing_set_filter_buffering(struct trace_array *tr, bool set)
-{
-	guard(mutex)(&trace_types_lock);
-
-	if (set && tr->no_filter_buffering_ref++)
-		return 0;
-
-	if (!set) {
-		if (WARN_ON_ONCE(!tr->no_filter_buffering_ref))
-			return -EINVAL;
-
-		--tr->no_filter_buffering_ref;
-	}
-
-	return 0;
-}
-
 struct ftrace_buffer_info {
 	struct trace_iterator	iter;
 	void			*spare;

kernel/trace/trace.h

@@ -476,7 +476,6 @@ extern struct trace_array *trace_array_find(const char *instance);
 extern struct trace_array *trace_array_find_get(const char *instance);
 
 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe);
-extern int tracing_set_filter_buffering(struct trace_array *tr, bool set);
 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
 
 extern bool trace_clock_in_ns(struct trace_array *tr);

kernel/trace/trace_events_hist.c

@@ -6531,6 +6531,26 @@ static bool existing_hist_update_only(char *glob,
 	return updated;
 }
 
+/*
+ * Set or disable using the per CPU trace_buffer_event when possible.
+ */
+static int tracing_set_filter_buffering(struct trace_array *tr, bool set)
+{
+	guard(mutex)(&trace_types_lock);
+
+	if (set && tr->no_filter_buffering_ref++)
+		return 0;
+
+	if (!set) {
+		if (WARN_ON_ONCE(!tr->no_filter_buffering_ref))
+			return -EINVAL;
+
+		--tr->no_filter_buffering_ref;
+	}
+
+	return 0;
+}
+
 static int hist_register_trigger(char *glob,
 				 struct event_trigger_data *data,
 				 struct trace_event_file *file)