dereference_pmd
dat_free_pt(dereference_pmd(table->crstes[i].pmd));
pgtable = dereference_pmd(entry.pmd);
dereference_pmd(crste.pmd), walk);
dat_free_pt(dereference_pmd(crste.pmd));
dat_free_pt(dereference_pmd(crste.pmd));