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  Fix trying to "push" an already active pool VP

Status in The Ubuntu-power-systems project:
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  Hello Canonical,

  Could you please include the following patch in Bionic?

  When setting up a CPU, we "push" (activate) a pool VP for it.

  However it's an error to do so if it already has an active
  pool VP.

  This happens when doing soft CPU hotplug on powernv since we
  don't tear down the CPU on unplug. The HW flags the error which
  gets captured by the diagnostics.

  Fix this by making sure to "pull" out any already active pool


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