rangeset_containing
ppr = rangeset_containing(&pmap->pm_pkru, sva);
ppr = rangeset_containing(&pmap->pm_pkru, va);
rs = rangeset_containing(pmap->pm_bti, sva);
rangeset_containing(pmap->pm_bti, va) != NULL)
void *rangeset_containing(struct rangeset *rs, uint64_t place);