ftrace: ensure every event gets an id
Impact: widen user-space visibe event IDs to all events
Previously only TRACE_EVENT events got ids, because only they
generated raw output which needs to be demuxed from the trace.
In order to provide a unique ID for each event, register everybody,
regardless.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20090319194233.464914218@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h
index ae2e323..4c26d97 100644
--- a/kernel/trace/trace_events_stage_3.h
+++ b/kernel/trace/trace_events_stage_3.h
@@ -130,7 +130,19 @@
{ \
unregister_trace_##call(ftrace_event_##call); \
} \
-
+ \
+static struct ftrace_event_call event_##call; \
+ \
+static int ftrace_init_event_##call(void) \
+{ \
+ int id; \
+ \
+ id = register_ftrace_event(NULL); \
+ if (!id) \
+ return -ENODEV; \
+ event_##call.id = id; \
+ return 0; \
+}
#undef TRACE_FORMAT
#define TRACE_FORMAT(call, proto, args, fmt) \
@@ -140,6 +152,7 @@
__attribute__((section("_ftrace_events"))) event_##call = { \
.name = #call, \
.system = __stringify(TRACE_SYSTEM), \
+ .raw_init = ftrace_init_event_##call, \
.regfunc = ftrace_reg_event_##call, \
.unregfunc = ftrace_unreg_event_##call, \
}
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index b451417..19261fd 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -481,6 +481,11 @@
mutex_lock(&trace_event_mutex);
+ if (!event) {
+ ret = next_event_type++;
+ goto out;
+ }
+
if (!event->type)
event->type = next_event_type++;
else if (event->type > __TRACE_LAST_TYPE) {
