+ *
+ * We also have to take into account the fact that memory that we're
+ * going to allocate from can belong to an externally allocated memory
+ * area, in which case the assumption of IOVA as VA mode being
+ * synonymous with IOVA contiguousness will not hold. We should also try
+ * to go for contiguous memory even if we're in no-huge mode, because
+ * external memory may in fact be IOVA-contiguous.