vm_addr_ok
while (!vm_addr_ok(VM_PAGE_TO_PHYS(m_ret),
vm_addr_ok(pa, size, alignment, boundary))
KASSERT(vm_addr_ok(pa_start, ptoa(npages), alignment, boundary),
KASSERT(vm_addr_ok(pa, size, alignment, boundary),
if (!vm_addr_ok(pa, size, alignment, boundary))
!vm_addr_ok(pa, size, alignment, boundary))