From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20578C43331 for ; Tue, 12 Nov 2019 20:38:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E8AFF206A3 for ; Tue, 12 Nov 2019 20:38:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="j3NNIjPO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727058AbfKLUiE (ORCPT ); Tue, 12 Nov 2019 15:38:04 -0500 Received: from mail-qk1-f195.google.com ([209.85.222.195]:43050 "EHLO mail-qk1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726645AbfKLUiE (ORCPT ); Tue, 12 Nov 2019 15:38:04 -0500 Received: by mail-qk1-f195.google.com with SMTP id z23so15705716qkj.10 for ; Tue, 12 Nov 2019 12:38:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=GMi4xT2UOd2CFR3VJjVGTgOG1WxBYR/HDNQyyBU/zGM=; b=j3NNIjPO3cADqvZd/hJQbIxM+DDhVRAEGcC+3T6+Q3fhxmcfREpCirlLaEIJBZkEdd e3aBqytbSt/O1y6azCg5mzciQb9aXN7nl404GgQzXcRXFb+31Gp+DUUM20vq+CBmnlhO OI6Itn853T6kP0jxgCe/92EYcvYqEI5wpO6FG/uJe2R9DweqI3FnTjwOvYkLmRQ3s4Xc zG96fPghzfwVyKWk9G5BMiBAMZoSIJhIZiNOrjmRw2PjfIwZlx+LuvDRDWa51OzyNGdk 7PnZkzKlvewWQFyt2QF7slB5Swx6CEiwuOCbZxYFCsytkVXhCWtpdK2fshpP/jsmV8fx ZjTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=GMi4xT2UOd2CFR3VJjVGTgOG1WxBYR/HDNQyyBU/zGM=; b=bdH7Oz4WUQ2hUI+wVI6VAiDjx/+XaLBHBhEqX0tHt5cZlfPb7YGWkMQybdfQ3MUfEF WNHq16OPeJE/2lj3uaP8gN0keg8ymZtNQAUK/uhM597fIrrylj7epGLzyjh909jWWhp6 hnAmBwDh5j2kIlPTgjO6p1+enC9TqiRUUbjpfk1M2r5DdyrpXwoknKawX8TarVUn2IwP GMwN6jctvIDpBtqVKsg0u2G/YtyXGqQ2qhjSSiCGxSLZHdkN+ZLfIBHvRjmroU6hkcgo +MaVLa/qFUgytI4zepO84okoUj2inqFDaHUk/DsBwVok2bDVJ158tTrIX/j0yn4qo7we KnTQ== X-Gm-Message-State: APjAAAVEkOBmEEjCzo5OLPR0PsEEVSSp01eoIKl7rhKvR9nRfR3+BRop YgtaZmpMuhG5yh7IpxXV2SYyKw== X-Google-Smtp-Source: APXvYqwLkTug1hfsKRZbiUckKPR5+bmE3pOvHeIup8u/vHZbKyWy6tiIbngDLXx22jZap3IUKn0tSg== X-Received: by 2002:a37:dc44:: with SMTP id v65mr7289252qki.72.1573591083419; Tue, 12 Nov 2019 12:38:03 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-113-180.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.113.180]) by smtp.gmail.com with ESMTPSA id k40sm11983680qta.76.2019.11.12.12.38.02 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 12 Nov 2019 12:38:02 -0800 (PST) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1iUcvK-00043t-G4; Tue, 12 Nov 2019 16:38:02 -0400 Date: Tue, 12 Nov 2019 16:38:02 -0400 From: Jason Gunthorpe To: John Hubbard Cc: Andrew Morton , Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , Christoph Hellwig , Dan Williams , Daniel Vetter , Dave Chinner , David Airlie , "David S . Miller" , Ira Weiny , Jan Kara , Jens Axboe , Jonathan Corbet , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Magnus Karlsson , Mauro Carvalho Chehab , Michael Ellerman , Michal Hocko , Mike Kravetz , Paul Mackerras , Shuah Khan , Vlastimil Babka , bpf@vger.kernel.org, dri-devel@lists.freedesktop.org, kvm@vger.kernel.org, linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, linux-rdma@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, linux-mm@kvack.org, LKML Subject: Re: [PATCH v3 00/23] mm/gup: track dma-pinned pages: FOLL_PIN, FOLL_LONGTERM Message-ID: <20191112203802.GD5584@ziepe.ca> References: <20191112000700.3455038-1-jhubbard@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191112000700.3455038-1-jhubbard@nvidia.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Mon, Nov 11, 2019 at 04:06:37PM -0800, John Hubbard wrote: > Hi, > > The cover letter is long, so the more important stuff is first: > > * Jason, if you or someone could look at the the VFIO cleanup (patch 8) > and conversion to FOLL_PIN (patch 18), to make sure it's use of > remote and longterm gup matches what we discussed during the review > of v2, I'd appreciate it. > > * Also for Jason and IB: as noted below, in patch 11, I am (too?) boldly > converting from put_user_pages() to release_pages(). Why are we doing this? I think things got confused here someplace, as the comment still says: /** * put_user_page() - release a gup-pinned page * @page: pointer to page to be released * * Pages that were pinned via get_user_pages*() must be released via * either put_user_page(), or one of the put_user_pages*() routines * below. I feel like if put_user_pages() is not the correct way to undo get_user_pages() then it needs to be deleted. Jason