add_work
.add_work = perf_kwork_add_work,
work = kwork->add_work(kwork, tmp.class, &tmp);
if ((data.nr != 0) && (add_work(kwork, &key, &data) != 0))
work = kwork->add_work(kwork, tmp.class, &tmp);
if (add_work(kwork, &key, &data[i], i))
struct kwork_work *(*add_work)(struct perf_kwork *kwork,