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Date:   Sun, 17 Sep 2017 19:39:45 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Jan Kara <jack@...e.cz>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-xfs@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
        Andy Lutomirski <luto@...nel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v4 2/3] mm: introduce MAP_VALIDATE a mechanism for
        adding new mmap flags

On Sat, Sep 16, 2017 at 08:44:14PM -0700, Dan Williams wrote:
> So it wasn't all that easy, and Linus declined to take it. I think we
> should add a new ->mmap_validate() file operation and save the
> tree-wide cleanup until later.

Note that we already have a mmap_capabilities callout for nommu,
I wonder if we could generalize that.

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