[stable] MIPS page-table fixes

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It looks like the following commits should be backported to all stable
branches:

commit 6d037de90a1fd7b4879b48d4dd5c4839b271be98
Author: Ralf Baechle <ra
lf@xxxxxxxxxxxxxx>
Date:   Fri Jul 1 15:01:01 2016 +0200

    MIPS: Fix possible corruption of cache mode by mprotect.

commit 88d02a2ba6c52350f9a73ff1b01a5be839c3ca17
Author: David Daney <david.daney@xxxxxxxxxx>
Date:   Thu Jun 16 15:50:31 2016 -0700

    MIPS: Fix page table corruption on THP permission changes.

The second seems to depend on the first, and the first seems to depend on:

commit 77a5c59332aa75e66f0d95f9eeb69baf3c68970d
Author: Steven J. Hill <Steven.Hill@xxxxxxxxxx>
Date:   Thu Nov 13 09:52:01 2014 -0600

    MIPS: Cosmetic cleanups of page table headers.

Does it make sense to pick all of these for stable?  Are 
there additional dependencies?

Ben.

-- 
Ben Hutchings
Sturgeon's Law: Ninety percent of everything is crap.

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