tracing: Do not use PERF enums when perf is not defined

commit 8eb1518642738c6892bd629b46043513a3bf1a6a upstream.

An update was made to up the module ref count when a synthetic event is
registered for both trace and perf events. But if perf is not configured
in, the perf enums used will cause the kernel to fail to build.

Cc: Masami Hiramatsu <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Douglas Raillard <[email protected]>
Link: https://lore.kernel.org/[email protected]
Fixes: 21581dd4e7ff ("tracing: Ensure module defining synth event cannot be unloaded while tracing")
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: rostedt

kernel/trace/trace_events_synth.c

@@ -881,8 +881,10 @@ static int synth_event_reg(struct trace_event_call *call,
 	struct synth_event *event = container_of(call, struct synth_event, call);
 
 	switch (type) {
-	case TRACE_REG_REGISTER:
+#ifdef CONFIG_PERF_EVENTS
 	case TRACE_REG_PERF_REGISTER:
+#endif
+	case TRACE_REG_REGISTER:
 		if (!try_module_get(event->mod))
 			return -EBUSY;
 		break;
@@ -893,8 +895,10 @@ static int synth_event_reg(struct trace_event_call *call,
 	int ret = trace_event_reg(call, type, data);
 
 	switch (type) {
-	case TRACE_REG_UNREGISTER:
+#ifdef CONFIG_PERF_EVENTS
 	case TRACE_REG_PERF_UNREGISTER:
+#endif
+	case TRACE_REG_UNREGISTER:
 		module_put(event->mod);
 		break;
 	default: