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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

This reverts fixes applied in Bug #1358949.

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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:
  Triaged
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Utopic:
  Triaged

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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