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[Craig Magina <1398596@xxxxxxxxxxxxxxxxxx>]

Upstream already root caused the issue, so logs are not needed.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1398596

Title:
  [Revert] arm64: optimized copy_to_user and copy_from_user assembly
  code

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  New
Status in linux source package in Utopic:
  New

Bug description:
  [Impact]
  Fixes an issue where the kernel hits unhandled pagefaults when copy_to_user is called.

  http://www.spinics.net/lists/arm-kernel/msg381811.html

  [Test Case]
  Put the system under memory pressure.

  [Regression Potential]
  It will cause a performance regression on certain workloads on arm64 systems.

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