408 void __sg_page_iter_start(struct sg_page_iter *piter,  in __sg_page_iter_start()  argument
412 	piter->__pg_advance = 0;  in __sg_page_iter_start()
413 	piter->__nents = nents;  in __sg_page_iter_start()
415 	piter->sg = sglist;  in __sg_page_iter_start()
416 	piter->sg_pgoffset = pgoffset;  in __sg_page_iter_start()
425 bool __sg_page_iter_next(struct sg_page_iter *piter)  in __sg_page_iter_next()  argument
427 	if (!piter->__nents || !piter->sg)  in __sg_page_iter_next()
430 	piter->sg_pgoffset += piter->__pg_advance;  in __sg_page_iter_next()
431 	piter->__pg_advance = 1;  in __sg_page_iter_next()
433 	while (piter->sg_pgoffset >= sg_page_count(piter->sg)) {  in __sg_page_iter_next()
434 		piter->sg_pgoffset -= sg_page_count(piter->sg);  in __sg_page_iter_next()
435 		piter->sg = sg_next(piter->sg);  in __sg_page_iter_next()
436 		if (!--piter->__nents || !piter->sg)  in __sg_page_iter_next()
461 	__sg_page_iter_start(&miter->piter, sgl, nents, 0);  in sg_miter_start()
473 		if (!__sg_page_iter_next(&miter->piter))  in sg_miter_get_next_page()
476 		sg = miter->piter.sg;  in sg_miter_get_next_page()
477 		pgoffset = miter->piter.sg_pgoffset;  in sg_miter_get_next_page()
555 	miter->page = sg_page_iter_page(&miter->piter);  in sg_miter_next()