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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <7bbcccc9-6ebf-ffab-7425-2a12f217ba15@redhat.com> References: <7bbcccc9-6ebf-ffab-7425-2a12f217ba15@redhat.com> <246ba813-698b-8696-7f4d-400034a3380b@redhat.com> <20230120175556.3556978-1-dhowells@redhat.com> <20230120175556.3556978-3-dhowells@redhat.com> <3814749.1674474663@warthog.procyon.org.uk> To: David Hildenbrand Cc: dhowells@redhat.com, Al Viro , Christoph Hellwig , Matthew Wilcox , Jens Axboe , Jan Kara , Jeff Layton , Logan Gunthorpe , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , John Hubbard , linux-mm@kvack.org Subject: Re: [PATCH v7 2/8] iov_iter: Add a function to extract a page list from an iterator MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <3903249.1674479992.1@warthog.procyon.org.uk> Content-Transfer-Encoding: quoted-printable Date: Mon, 23 Jan 2023 13:19:52 +0000 Message-ID: <3903251.1674479992@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 784B7180017 X-Stat-Signature: c185spq93wfsr6sqb7u4z7jmazcrogzs X-HE-Tag: 1674479999-157885 X-HE-Meta: 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 XajGmDaR Oettxth9MP4yHa41a8lp2m0CxHnvEXj9UOiMW2FE1TpP88RtO8V9gqCg6BbGk8LT3aTScKHpoHhqv9eN+loCVzrj2PtJ7UZJuMnZ1JCbW1e9i1rh+hqLqsGoACWb+VgaM6aIirfbPk8HV8qPLKHya+fHu2z/r8qp9TgMHo/vwqcgTpYjVBqL2r/lqctcn6T4x0Pp/TT1jBuxK8hnD13q0n8uy9jkKuDOGrQLtuBuebJ2aBeFrSHLV53QANVnIKHWydZBbzLncRFAO7Hg0+x1m73EJq2OwLFQuo5mQGqGz40Kz2wDaqVsRkwEcQw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: David Hildenbrand wrote: > Switching from FOLL_GET to FOLL_PIN was in the works by John H. Not sure= what > the status is. Interestingly, Documentation/core-api/pin_user_pages.rst > already documents that "CASE 1: Direct IO (DIO)" uses FOLL_PIN ... which= does, > unfortunately, no reflect reality yet. Yeah - I just came across that. Should iov_iter.c then switch entirely to using pin_user_pages(), rather t= han get_user_pages()? In which case my patches only need keep track of pinned/not-pinned and never "got". David