linux-kernel - Re: [RFC 00/17] DRM: fix struct sg_table nents vs. orig

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Message-ID: <20200428140257.GA3433@lst.de>
Date:   Tue, 28 Apr 2020 16:02:57 +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>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        intel-gfx@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        amd-gfx@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [RFC 00/17] DRM: fix struct sg_table nents vs. orig_nents
 misuse

On Tue, Apr 28, 2020 at 03:19:48PM +0200, Marek Szyprowski wrote:
> 1. introduce a dma_{map,sync,unmap}_sgtable() wrappers, which will use
>    a proper sg_table entries and call respective DMA-mapping functions
>    and adapt current code to it

That sounds reasonable to me.  Those could be pretty trivial wrappers.

>
> 
> 2. rename nents and orig_nents to nr_pages, nr_dmas to clearly state
>    which one refers to which part of the scatterlist; I'm open for
>    other names for those entries

nr_cpu_ents and nr_dma_ents might be better names, but it still would be
a whole lot of churn for little gain.  I think just good wrappers like
suggested above might be more helpful.