uvm_map_clean
int uvm_map_clean(struct vm_map *, vaddr_t, vaddr_t, int);
return uvm_map_clean(&p->p_vmspace->vm_map, addr, addr+size, uvmflags);
error = uvm_map_clean(&p->p_vmspace->vm_map, addr, addr + size,
error = uvm_map_clean(&p->p_vmspace->vm_map, addr, addr + size,