tracing/filter: Simplify tracepoint event lookup

We dont need to perform lookup through the ftrace_events list,
instead we can use the 'tp_event' field.

Each perf_event contains tracepoint event field 'tp_event', which
got initialized during the tracepoint event initialization.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1313072754-4620-5-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 3 insertions, 6 deletions

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 97b93f31884b..0948905dd39c 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1894,17 +1894,14 @@ int ftrace_profile_set_filter(struct perf_event *event, int event_id,
         int err;
         struct event_filter *filter;
         struct filter_parse_state *ps;
-        struct ftrace_event_call *call = NULL;
+        struct ftrace_event_call *call;
 
         mutex_lock(&event_mutex);
 
-        list_for_each_entry(call, &ftrace_events, list) {
-                if (call->event.type == event_id)
-                        break;
-        }
+        call = event->tp_event;
 
         err = -EINVAL;
-        if (&call->list == &ftrace_events)
+        if (!call)
                 goto out_unlock;
 
         err = -EEXIST;