VOID
MiFlushInPageSupportBlock(
  );

Routine Description:

    This routine examines the number of freed in page support blocks,
    and if more than 4, frees the blocks back to the NonPagedPool.


   ****** NB: The PFN LOCK is RELEASED and reacquired during this call ******


Arguments:

    None.

Return Value:

    None.

Environment:

    Kernel mode, PFN lock held.