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[Bug 1357014] [NEW] Add THP fixes in 14.10 kernel


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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,

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Tags: architecture-ppc64le bugnameltc-114730 severity-high targetmilestone-inin1410
Add THP fixes in 14.10 kernel
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