sg_page
page = sg_page(sg);
s.pfn = page_to_pfn(sg_page(s.sgp));
sg_set_page(new_sg, sg_page(sg), sg->length, 0);
return kmap(sg_page(sgt->sgl));
return nth_page(sg_page(sg), offset);
sg_set_page(dst, sg_page(src), src->length, 0);
if (sg_page(sg))
__free_pages(sg_page(sg), get_order(sg->length));
return sg_page(vma->pages->sgl);
sg_page(sg) = page;
return ((struct vm_page *)sg_page(sg))->phys_addr + sg->offset;
return nth_page(sg_page(piter->sg), piter->sg_pgoffset);