ACK w/cmt: SRU LP 1398596 [Revert] arm64: optimized copy_to_user and copy_from_user assembly code

[Chris J Arges]

On Wed, Dec 03, 2014 at 02:33:41PM -0500, Craig Magina wrote:
> This reverts commit d7d4ccba121e82e702e187d507bc3534e1c51c6a.
>

As upstream is also doing this, it makes sense to do the same.

Thanks,
 
> A kernel crash was root caused to the copy_to_user arm64 optimizations
> and upstream has requested the patch be reverted from the Ubuntu
> kernel. [1]
> 
> BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1398596
> 
> [1] http://www.spinics.net/lists/arm-kernel/msg381811.html
> 
> The following changes since commit f37b1e1d9898e7c9ce80ed2a73c7beca3ca5040f:
> 
>   UBUNTU: Ubuntu-3.13.0-41.70 (2014-11-25 12:08:32 +0000)
> 
> are available in the git repository at:
> 
>   git://kernel.ubuntu.com/cmagina/trusty-xgene.git lp1398596
> 
> for you to fetch changes up to a51ae3b13b6dddc612431a912a77a6336d568039:
> 
>   Revert "UBUNTU: SAUCE: (no-up) arm64: optimized copy_to_user and
> copy_from_user assembly code" (2014-12-03 14:28:26 -0500)
> 
> Thanks,
> -- 
> Craig Magina
> Hyperscale Team
> Canonical
> 
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