uvm_io
if ((error = uvm_io(&vm->vm_map, &uio, 0)) != 0)
if ((error = uvm_io(&vm->vm_map, &uio, 0)) != 0)
if ((error = uvm_io(&vm->vm_map, &uio, 0)) != 0)
error = uvm_io(&vm->vm_map, uio, UVM_IO_FIXPROT);
int uvm_io(vm_map_t, struct uio *, int);