uvm_mapent_free_insert
uvm_mapent_free_insert(map, free, e1);
void uvm_mapent_free_insert(struct vm_map*,
uvm_mapent_free_insert(map, free_before, orig);
uvm_mapent_free_insert(map, free, next);
uvm_mapent_free_insert(map, free, tmp);
uvm_mapent_free_insert(map, entfree, entry);
uvm_mapent_free_insert(map, entfree, entry);