for (; sg && sg_add; sg = sg_next(sg), sg_add = sg_next(sg_add)) {
sg_set_page(sg, sg_page(sg_add), sg_add->length,
sg_add->offset);
sg_last = sg;
}
for (; sg && sg_add; sg = sg_next(sg), sg_add = sg_next(sg_add)) {
sg_set_page(sg, sg_page(sg_add), sg_add->length,
sg_add->offset);
sg_last = sg;
}