user_read_state
static enum user_read_state set_user_read(struct perf_pmu *pmu, enum user_read_state enabled)
enum user_read_state old_user_read = USER_READ_UNKNOWN;
static int test_stat_user_read(u64 event, enum user_read_state enabled)
enum user_read_state saved_user_read_state = set_user_read(pmu, enabled);