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Test that PERF_EVENT_IOC_MODIFY_ATTRIBUTES correctly modifies perf_event_attr::sig_data as well. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> Link: https://lore.kernel.org/r/20220131103407.1971678-2-elver@google.com