Revert "UPSTREAM: ARM: Remove current_mm per-cpu variable"
This originally removed some not-needed code, but the recent A15 errata
workaround actually needs current_mm still around. So for bring this
code back for that reason.
This reverts commit
696cfa01f12ec85ac7122eb57d77c8598f79ff71.
BUG=chromium:226280
TEST=build kernel for daisy
Change-Id: Ie44c6bfea7137ca185eb568f9047bca39f3e1b5c
Signed-off-by: Olof Johansson <olofj@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/47426
Reviewed-by: Doug Anderson <dianders@chromium.org>