linux-kernel - Re: [PATCHv3 1/2] mm/gup: fix omission of check on FOLL_LONGTERM in get_user_pages

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Message-ID: <20190611135212.GA4591@infradead.org>
Date:   Tue, 11 Jun 2019 06:52:12 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     John Hubbard <jhubbard@...dia.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Ira Weiny <ira.weiny@...el.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Keith Busch <keith.busch@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3 1/2] mm/gup: fix omission of check on FOLL_LONGTERM in
 get_user_pages_fast()

On Tue, Jun 11, 2019 at 08:29:35PM +0800, Pingfan Liu wrote:
> Unable to get a NVME device to have a test. And when testing fio on the

How would a nvme test help?  FOLL_LONGTERM isn't used by any performance
critical path to start with, so I don't see how this patch could be
a problem.