uvm_mapent_clone
struct vm_map_entry *uvm_mapent_clone(struct vm_map*, vaddr_t, vsize_t,
return uvm_mapent_clone(dstmap, dstaddr, dstlen, off,
new_entry = uvm_mapent_clone(new_map, old_entry->start,
new_entry = uvm_mapent_clone(new_map, old_entry->start,
newentry = uvm_mapent_clone(kernel_map,