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>

1 files changed, 5 insertions, 0 deletions

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index b45141748af5..19261fdd2455 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -481,6 +481,11 @@ int register_ftrace_event(struct trace_event *event)
 
         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) {