436 void __sg_page_iter_start(struct sg_page_iter *piter,  in __sg_page_iter_start()  argument
440 	piter->__pg_advance = 0;  in __sg_page_iter_start()
441 	piter->__nents = nents;  in __sg_page_iter_start()
443 	piter->sg = sglist;  in __sg_page_iter_start()
444 	piter->sg_pgoffset = pgoffset;  in __sg_page_iter_start()
453 bool __sg_page_iter_next(struct sg_page_iter *piter)  in __sg_page_iter_next()  argument
455 	if (!piter->__nents || !piter->sg)  in __sg_page_iter_next()
458 	piter->sg_pgoffset += piter->__pg_advance;  in __sg_page_iter_next()
459 	piter->__pg_advance = 1;  in __sg_page_iter_next()
461 	while (piter->sg_pgoffset >= sg_page_count(piter->sg)) {  in __sg_page_iter_next()
462 		piter->sg_pgoffset -= sg_page_count(piter->sg);  in __sg_page_iter_next()
463 		piter->sg = sg_next(piter->sg);  in __sg_page_iter_next()
464 		if (!--piter->__nents || !piter->sg)  in __sg_page_iter_next()
489 	__sg_page_iter_start(&miter->piter, sgl, nents, 0);  in sg_miter_start()
501 		if (!__sg_page_iter_next(&miter->piter))  in sg_miter_get_next_page()
504 		sg = miter->piter.sg;  in sg_miter_get_next_page()
505 		pgoffset = miter->piter.sg_pgoffset;  in sg_miter_get_next_page()
583 	miter->page = sg_page_iter_page(&miter->piter);  in sg_miter_next()