[SRU][Trusty][Xenial][PATCH 0/2] Fixes for lp1658270

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1658270

== SRU Justification ==
Commit 082d4acb9429 in Trusty introduced this bug in Ubuntu-3.13.0-100.147.
The commit was added to Trusty for via a CVE update. 
The bug resulted in some Delphi apps freezing wineserver and leaving it unkillable
as reported in this upstream bug report:
https://bugs.winehq.org/show_bug.cgi?id=41637

This bug was also introduced into Xenial by the same patch(Xenial commit b56d2a75e1da).

A patch was submitted upstrem to fix this bug, but it has not landed in mailine as of yet:
https://patchwork.kernel.org/patch/9499897/

This patch has been tested and resolves this bug.  However, it requires 
mainline commit c164e038eee8 as a prereq in Trusty only.  Commit c164e038eee8 needed to be backported
to Trusty since it was not a clean pick.


== Fixes ==
Trusty only:
commit c164e038eee805147e95789dddb88ae3b3aca11c
Author: Kirill A. Shutemov <kirill at shutemov.name>
Date:   Wed Dec 10 15:44:36 2014 -0800

    mm: fix huge zero page accounting in smaps report

Both Trusty and Xenial:
Author: Keno Fischer <keno at juliacomputing.com>
Date:   Mon Jan 23 15:35:50 2017 -0500

    mm: Respect FOLL_FORCE/FOLL_COW for thp


== Test Case ==
A test kernel was built with these patches and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.

Keno Fischer (1):
  mm: Respect FOLL_FORCE/FOLL_COW for thp

Kirill A. Shutemov (1):
  mm: fix huge zero page accounting in smaps report

 arch/arm64/include/asm/pgtable.h         |  18 ++++++
 arch/powerpc/include/asm/pgtable-ppc64.h |   1 +
 arch/sparc/include/asm/pgtable_64.h      |   7 +++
 arch/x86/include/asm/pgtable.h           |   5 ++
 fs/proc/task_mmu.c                       | 104 ++++++++++++++++++++-----------
 mm/huge_memory.c                         |  12 +++-
 6 files changed, 110 insertions(+), 37 deletions(-)

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2.7.4