tracing: Have all triggers expect a file parameter

When the triggers were first created, they may not have had a file
parameter passed to them and things needed to be done generically.

But today, all triggers have a file parameter passed to them. Remove the
generic code and add a "if (WARN_ON_ONCE(!file))" to each trigger.

Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Link: https://patch.msgid.link/20260206101351.609d8906@gandalf.local.home
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Author: rostedt

kernel/trace/trace_events_trigger.c

@@ -1347,18 +1347,13 @@ traceon_trigger(struct event_trigger_data *data,
 {
 	struct trace_event_file *file = data->private_data;
 
-	if (file) {
-		if (tracer_tracing_is_on(file->tr))
-			return;
-
-		tracer_tracing_on(file->tr);
+	if (WARN_ON_ONCE(!file))
 		return;
-	}
 
-	if (tracing_is_on())
+	if (tracer_tracing_is_on(file->tr))
 		return;
 
-	tracing_on();
+	tracer_tracing_on(file->tr);
 }
 
 static bool
@@ -1368,13 +1363,11 @@ traceon_count_func(struct event_trigger_data *data,
 {
 	struct trace_event_file *file = data->private_data;
 
-	if (file) {
-		if (tracer_tracing_is_on(file->tr))
-			return false;
-	} else {
-		if (tracing_is_on())
-			return false;
-	}
+	if (WARN_ON_ONCE(!file))
+		return false;
+
+	if (tracer_tracing_is_on(file->tr))
+		return false;
 
 	if (!data->count)
 		return false;
@@ -1392,18 +1385,13 @@ traceoff_trigger(struct event_trigger_data *data,
 {
 	struct trace_event_file *file = data->private_data;
 
-	if (file) {
-		if (!tracer_tracing_is_on(file->tr))
-			return;
-
-		tracer_tracing_off(file->tr);
+	if (WARN_ON_ONCE(!file))
 		return;
-	}
 
-	if (!tracing_is_on())
+	if (!tracer_tracing_is_on(file->tr))
 		return;
 
-	tracing_off();
+	tracer_tracing_off(file->tr);
 }
 
 static bool
@@ -1413,13 +1401,11 @@ traceoff_count_func(struct event_trigger_data *data,
 {
 	struct trace_event_file *file = data->private_data;
 
-	if (file) {
-		if (!tracer_tracing_is_on(file->tr))
-			return false;
-	} else {
-		if (!tracing_is_on())
-			return false;
-	}
+	if (WARN_ON_ONCE(!file))
+		return false;
+
+	if (!tracer_tracing_is_on(file->tr))
+		return false;
 
 	if (!data->count)
 		return false;
@@ -1481,10 +1467,10 @@ snapshot_trigger(struct event_trigger_data *data,
 {
 	struct trace_event_file *file = data->private_data;
 
-	if (file)
-		tracing_snapshot_instance(file->tr);
-	else
-		tracing_snapshot();
+	if (WARN_ON_ONCE(!file))
+		return;
+
+	tracing_snapshot_instance(file->tr);
 }
 
 static int
@@ -1570,10 +1556,10 @@ stacktrace_trigger(struct event_trigger_data *data,
 {
 	struct trace_event_file *file = data->private_data;
 
-	if (file)
-		__trace_stack(file->tr, tracing_gen_ctx_dec(), STACK_SKIP);
-	else
-		trace_dump_stack(STACK_SKIP);
+	if (WARN_ON_ONCE(!file))
+		return;
+
+	__trace_stack(file->tr, tracing_gen_ctx_dec(), STACK_SKIP);
 }
 
 static int