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Date:   Thu, 20 Jan 2022 15:00:47 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Jason Gunthorpe <jgg@nvidia.com>
Cc:     Matthew Wilcox <willy@infradead.org>, linux-kernel@vger.kernel.org,
        Christoph Hellwig <hch@lst.de>,
        Joao Martins <joao.m.martins@oracle.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Logan Gunthorpe <logang@deltatee.com>,
        Ming Lei <ming.lei@redhat.com>, linux-block@vger.kernel.org,
        netdev@vger.kernel.org, linux-mm@kvack.org,
        linux-rdma@vger.kernel.org, dri-devel@lists.freedesktop.org,
        nvdimm@lists.linux.dev
Subject: Re: Phyr Starter
Message-ID: <20220120140047.GB11223@lst.de>
References: <YdyKWeU0HTv8m7wD@casper.infradead.org> <20220111004126.GJ2328285@nvidia.com> <Yd0IeK5s/E0fuWqn@casper.infradead.org> <20220111150142.GL2328285@nvidia.com>
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On Tue, Jan 11, 2022 at 11:01:42AM -0400, Jason Gunthorpe wrote:
> Then we are we using get_user_phyr() at all if we are just storing it
> in a sg?

I think we need to stop calling the output of the phyr dma map
helper a sg.  Yes, a { dma_addr, len } tuple is scatter/gather I/O in its
purest form, but it will need a different name in Linux as the scatterlist
will have to stay around for a long time before all that mess is cleaned
up.