Capture that these functions don't mutate their input.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/trace-event-parse.c | 2 +-
 tools/perf/util/trace-event.h       | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 41d53e1b43e7..9c015fc2bcfb 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -99,7 +99,7 @@ unsigned long long read_size(struct tep_event *event, void *ptr, int size)
 	return tep_read_number(event->tep, ptr, size);
 }
 
-void event_format__fprintf(struct tep_event *event,
+void event_format__fprintf(const struct tep_event *event,
 			   int cpu, void *data, int size, FILE *fp)
 {
 	struct tep_record record;
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 79b939f947dd..2543bf969fdd 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -39,7 +39,7 @@ trace_event__tp_format(const char *sys, const char *name);
 
 struct tep_event *trace_event__tp_format_id(int id);
 
-void event_format__fprintf(struct tep_event *event,
+void event_format__fprintf(const struct tep_event *event,
 			   int cpu, void *data, int size, FILE *fp);
 
 int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size);
-- 
2.47.0.338.g60cca15819-goog