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-rw-r--r--tools/perf/builtin-diff.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 57d300d8e570..4c0567882a7a 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -388,7 +388,7 @@ struct hist_entry_ops block_hist_ops = {
.free = block_hist_free,
};
-static int diff__process_sample_event(struct perf_tool *tool,
+static int diff__process_sample_event(const struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct evsel *evsel,