[PATCH v3 02/25] drm: core: fix common struct sg_table related issues

[Christoph Hellwig]

> -		for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
> +		for_each_sg_page(st->sgl, &sg_iter, st->orig_nents, 0)

Would it make sense to also add a for_each_sgtable_page helper that
hides the use of orig_nents?  To be used like:

		for_each_sgtable_page(st, &sg_iter, 0) {

> +	for_each_sg(sgt->sgl, sg, sgt->orig_nents, count) {

Same here, e.g.

	for_each_sgtable_entry(sgt, sg, count) {

?