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[Launchpad Bug Tracker <1357014@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.16.0-9.14

---------------
linux (3.16.0-9.14) utopic; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1357370

  [ Serge Hallyn ]

  * SAUCE: Overlayfs: allow unprivileged mounts
    - LP: #1357025

  [ Upstream Kernel Changes ]

  * MAINTAINERS: Add entry for APM X-Gene SoC ethernet driver
  * Documentation: dts: Add bindings for APM X-Gene SoC ethernet driver
  * dts: Add bindings for APM X-Gene SoC ethernet driver
  * drivers: net: Add APM X-Gene SoC ethernet driver support.
  * powerpc/thp: Add write barrier after updating the valid bit
    - LP: #1357014
  * powerpc/thp: Don't recompute vsid and ssize in loop on invalidate
    - LP: #1357014
  * powerpc/thp: Invalidate old 64K based hash page mapping before insert
    of 4k pte
    - LP: #1357014
  * powerpc/thp: Handle combo pages in invalidate
    - LP: #1357014
  * powerpc/thp: Invalidate with vpn in loop
    - LP: #1357014
  * powerpc/thp: Use ACCESS_ONCE when loading pmdp
    - LP: #1357014
  * powerpc/mm: Use read barrier when creating real_pte
    - LP: #1357014
  * powerpc/thp: Add tracepoints to track hugepage invalidate
    - LP: #1357014
  * rebase to v3.16.1
 -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx>   Thu, 14 Aug 2014 08:18:02 -0400

** Changed in: linux (Ubuntu Utopic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1357014

Title:
  Add THP fixes in 14.10 kernel

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  In Progress
Status in “linux” source package in Utopic:
  Fix Released

Bug description:
  Hi Canonical,

  We would like to include 8 patches regarding Transparent Huge Page for
  powerpc. The patches are already upstream on Ben powerpc-next tree and
  should be sent to Linus' tree today, which mean that they are expected
  to make 3.17.

  Here are the patches

  9e813308a5c18c58f9ccae1ec72ed4e14eaf9025 powerpc/thp: Add tracepoints to track hugepage invalidate
  85c1fafd7262e68ad821ee1808686b1392b1167d powerpc/mm: Use read barrier when creating real_pte
  7e467245bf5226db34c4b12d3cbacfa2f7a15a8b powerpc/thp: Use ACCESS_ONCE when loading pmdp
  969b7b208f7408712a3526856e4ae60ad13f6928 powerpc/thp: Invalidate with vpn in loop
  fc0479557572375100ef16c71170b29a98e0d69a powerpc/thp: Handle combo pages in invalidate
  629149fae478f0ac6bf705a535708b192e9c6b59 powerpc/thp: Invalidate old 64K based hash page mapping before insert of 4k pte
  fa1f8ae80f8bb996594167ff4750a0b0a5a5bb5d powerpc/thp: Don't recompute vsid and ssize in loop on invalidate
  b0aa44a3dfae3d8f45bd1264349aa87f87b7774f powerpc/thp: Add write barrier after updating the valid bit

  I am also adding the patches here for reference.

  Thank you,
  Breno

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