rdlbr_from
u64 from = rdlbr_from(idx, NULL);
return x86_pmu.lbr_deep_c_reset && !rdlbr_from(0, NULL);
return !rdlbr_from(((struct x86_perf_task_context *)ctx)->tos, NULL);
from = rdlbr_from(lbr_idx, NULL);
from = rdlbr_from(i, lbr);