600 void __sg_page_iter_start(struct sg_page_iter *piter,  in __sg_page_iter_start()  argument
604 	piter->__pg_advance = 0;  in __sg_page_iter_start()
605 	piter->__nents = nents;  in __sg_page_iter_start()
607 	piter->sg = sglist;  in __sg_page_iter_start()
608 	piter->sg_pgoffset = pgoffset;  in __sg_page_iter_start()
617 bool __sg_page_iter_next(struct sg_page_iter *piter)  in __sg_page_iter_next()  argument
619 	if (!piter->__nents || !piter->sg)  in __sg_page_iter_next()
622 	piter->sg_pgoffset += piter->__pg_advance;  in __sg_page_iter_next()
623 	piter->__pg_advance = 1;  in __sg_page_iter_next()
625 	while (piter->sg_pgoffset >= sg_page_count(piter->sg)) {  in __sg_page_iter_next()
626 		piter->sg_pgoffset -= sg_page_count(piter->sg);  in __sg_page_iter_next()
627 		piter->sg = sg_next(piter->sg);  in __sg_page_iter_next()
628 		if (!--piter->__nents || !piter->sg)  in __sg_page_iter_next()
643 	struct sg_page_iter *piter = &dma_iter->base;  in __sg_page_iter_dma_next()  local
645 	if (!piter->__nents || !piter->sg)  in __sg_page_iter_dma_next()
648 	piter->sg_pgoffset += piter->__pg_advance;  in __sg_page_iter_dma_next()
649 	piter->__pg_advance = 1;  in __sg_page_iter_dma_next()
651 	while (piter->sg_pgoffset >= sg_dma_page_count(piter->sg)) {  in __sg_page_iter_dma_next()
652 		piter->sg_pgoffset -= sg_dma_page_count(piter->sg);  in __sg_page_iter_dma_next()
653 		piter->sg = sg_next(piter->sg);  in __sg_page_iter_dma_next()
654 		if (!--piter->__nents || !piter->sg)  in __sg_page_iter_dma_next()
679 	__sg_page_iter_start(&miter->piter, sgl, nents, 0);  in sg_miter_start()
690 		if (!__sg_page_iter_next(&miter->piter))  in sg_miter_get_next_page()
693 		sg = miter->piter.sg;  in sg_miter_get_next_page()
695 		miter->__offset = miter->piter.sg_pgoffset ? 0 : sg->offset;  in sg_miter_get_next_page()
696 		miter->piter.sg_pgoffset += miter->__offset >> PAGE_SHIFT;  in sg_miter_get_next_page()
699 				     (miter->piter.sg_pgoffset << PAGE_SHIFT) -  in sg_miter_get_next_page()
774 	miter->page = sg_page_iter_page(&miter->piter);  in sg_miter_next()