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Date:   Sun, 17 Sep 2017 19:39:45 +0200
From:   Christoph Hellwig <>
To:     Dan Williams <>
Cc:     Jan Kara <>,
        "Darrick J. Wong" <>,
        Arnd Bergmann <>,
        "" <>,
        Linux API <>,
        Linux Kernel Mailing List <>,, linux-mm <>,
        Andy Lutomirski <>,
        linux-fsdevel <>,
        Andrew Morton <>,
        Christoph Hellwig <>
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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