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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <20230126141626.2809643-1-dhowells@redhat.com> <20230126141626.2809643-3-dhowells@redhat.com> To: David Hildenbrand Cc: dhowells@redhat.com, Al Viro , Christoph Hellwig , Matthew Wilcox , Jens Axboe , Jan Kara , Jeff Layton , Jason Gunthorpe , Logan Gunthorpe , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig , John Hubbard Subject: Re: [PATCH v11 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: <2907149.1674777410.1@warthog.procyon.org.uk> Date: Thu, 26 Jan 2023 23:56:50 +0000 Message-ID: <2907150.1674777410@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Rspam-User: X-Rspamd-Queue-Id: C5226180017 X-Rspamd-Server: rspam01 X-Stat-Signature: ko44swz9a7ocp17a58w8xoib6dp4n15s X-HE-Tag: 1674777421-525479 X-HE-Meta: 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 sG/HwqIQ K9S89eHRPcBgG8JCa33bwDDMjiErXeUHe5Dzzqfeb+yWcEyTDi9BqOwySUqnqeTTThMbGD8cGpNu+tLsM/Eb/83tp9WWF+1pRA/4xbaCWmbjKuwMnl6oN/yD+Y1a0opRBe8n72KcTjXli8ibIpRleVbxSkpnxrL0Nao1ECywGptPRXNmZgWI4EBbKv1OYQJBpMT9322Fu02ecl6btC42khkignBas5lBpUky9Ty8GDwHl12F9Mv+eGNx2XRLMXO9xHThJr/AhkUg7jgkabbiX4G0qJ+JGtM4eZVcD 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: Al says that pinning a page (ie. FOLL_PIN) could cause a deadlock if a page is vmspliced into a pipe with the pipe holding a pin on it because pinned pages are removed from all page tables. Is this actually the case? I can't see offhand where in mm/gup.c it does this. David