linux-kernel - Re: remove the ->mapping_error method from dma_map

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Date:   Thu, 29 Nov 2018 19:55:37 +0100
From:   Christoph Hellwig <hch@....de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@....de>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        linux-arch@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-parisc@...r.kernel.org, robin.murphy@....com,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        iommu@...ts.linux-foundation.org, linux-alpha@...r.kernel.org,
        xen-devel@...ts.xenproject.org,
        David Woodhouse <dwmw2@...radead.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: remove the ->mapping_error method from dma_map_ops V2

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.