uvm_unmap(map, trunc_page(start), round_page(start + size));
if (size == (vaddr_t) 0) return (KERN_SUCCESS);  return(uvm_unmap(map, trunc_page(start), round_page(start+size)));
uvm_deallocate(map, start, size)	struct vm_map *map;	vaddr_t start;	vsize_t size;{	if (size == 0)		return;	uvm_unmap(map, trunc_page(start), round_page(start + size));}