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Subject[PATCH 04/10] tracing/filter: Simplify tracepoint event lookup
Date
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>
---
kernel/trace/trace_events_filter.c | 9 +++------
1 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 97b93f3..0948905 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;
--
1.7.1


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