Re: remove the ->mapping_error method from dma_map_ops V2
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- To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- Subject: Re: remove the ->mapping_error method from dma_map_ops V2
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Thu, 29 Nov 2018 19:55:37 +0100
- Cc: Christoph Hellwig <hch@xxxxxx>, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, robin.murphy@xxxxxxx, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux List Kernel Mailing <linux-kernel@xxxxxxxxxxxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-alpha@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
- In-reply-to: <CAHk-=wjjmtZAAGvB8c6hyKvABPHNTfE+b+eHu7iktdogDfTgMw@mail.gmail.com>
- References: <20181128074117.GA21126@lst.de> <CAHk-=wg5+rXK8dpjkSmK7tuz29VfxVWNEwmTVYB409mmyLkeew@mail.gmail.com> <20181128174545.GJ30658@n2100.armlinux.org.uk> <CAHk-=whnz4Kty6cas11bc2Gh=9zTzeeRS2k=dV9Hfc4B=xnHkQ@mail.gmail.com> <20181128180841.GM30658@n2100.armlinux.org.uk> <CAHk-=whcbiSxSUprsKjVPEdN5-+o8WnTGiKxEV-+HbKNDs=iNA@mail.gmail.com> <20181129162323.GA27068@lst.de> <CAHk-=wi2K7_+dgCbc-sAK9CST5Zh+pOuH7sVT9WW-kqs50HSzQ@mail.gmail.com> <20181129183132.GA30281@lst.de> <CAHk-=wjjmtZAAGvB8c6hyKvABPHNTfE+b+eHu7iktdogDfTgMw@mail.gmail.com>
- User-agent: Mutt/1.5.17 (2007-11-01)
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.
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