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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