linux-kernel - Re: [PATCH v4 1/1] mm: introduce put_user

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Message-ID: <01000169989db656-8868a4b2-a8eb-4666-872f-2ed9885c99e6-000000@email.amazonses.com>
Date:   Wed, 20 Mar 2019 01:01:06 +0000
From:   Christopher Lameter <cl@...ux.com>
To:     Dave Chinner <david@...morbit.com>
cc:     Jerome Glisse <jglisse@...hat.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        john.hubbard@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm@...ck.org, Al Viro <viro@...iv.linux.org.uk>,
        Christian Benvenuti <benve@...co.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Tom Talpey <tom@...pey.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, John Hubbard <jhubbard@...dia.com>,
        Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder
 versions

On Wed, 20 Mar 2019, Dave Chinner wrote:

> So the plan for GUP vs writeback so far is "break fsync()"? :)

Well if its an anonymous page and not a file backed page then the
semantics are preserved. Disallow GUP long term pinning (marking stuff like in this
patchset may make that possible) and its clean.