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-rw-r--r--kernel/trace/trace_events.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 6f965864cc02..b7b0760ba6ee 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -204,6 +204,24 @@ static void trace_destroy_fields(struct trace_event_call *call)
}
}
+/*
+ * run-time version of trace_event_get_offsets_<call>() that returns the last
+ * accessible offset of trace fields excluding __dynamic_array bytes
+ */
+int trace_event_get_offsets(struct trace_event_call *call)
+{
+ struct ftrace_event_field *tail;
+ struct list_head *head;
+
+ head = trace_get_fields(call);
+ /*
+ * head->next points to the last field with the largest offset,
+ * since it was added last by trace_define_field()
+ */
+ tail = list_first_entry(head, struct ftrace_event_field, link);
+ return tail->offset + tail->size;
+}
+
int trace_event_raw_init(struct trace_event_call *call)
{
int id;