MT_DIAG
stcctm(MT_DIAG, mtid, cycles_new);
stcctm(MT_DIAG, smp_cpu_mtid, (u64 *)&idle->mt_cycles_enter);
stcctm(MT_DIAG, smp_cpu_mtid + 1, this_cpu_ptr(mt_cycles));
stcctm(MT_DIAG, smp_cpu_mtid + 1, cycles_new);