linux-kernel - Re: [PATCH v3 02/25] drm: core: fix common struct sg

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Date:   Tue, 5 May 2020 12:15:08 +0200
From:   Christoph Hellwig <hch@....de>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     dri-devel@...ts.freedesktop.org, iommu@...ts.linux-foundation.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Robin Murphy <robin.murphy@....com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: Re: [PATCH v3 02/25] drm: core: fix common struct sg_table related
 issues

> -		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) {

?