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Date:   Thu, 29 Nov 2018 19:55:37 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Christoph Hellwig <hch@lst.de>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
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        David Woodhouse <dwmw2@infradead.org>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: remove the ->mapping_error method from dma_map_ops V2
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On Thu, Nov 29, 2018 at 10:53:32AM -0800, Linus Torvalds wrote:
> Most of the high-performance IO is already using SG lists anyway, no?
> Disk/networking/whatever.

Networking basically never uses S/G lists.  Block I/O mostly uses it,
and graphics / media seems to have a fair amount of S/G uses, including
very, erm special ones.