umem_cpu_log_header_t
umem_cpu_log_header_t clh;
clhp += sizeof (umem_cpu_log_header_t);
umem_cpu_log_header_t *clhp = &lhp->lh_cpu[i];
umem_cpu_log_header_t *clhp;
umem_cpu_log_header_t lh_cpu[1]; /* actually umem_max_ncpus */