--- zzzz-none-000/linux-4.4.60/arch/arm64/mm/flush.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/arch/arm64/mm/flush.c	2021-02-04 17:41:59.000000000 +0000
@@ -115,3 +115,21 @@
 }
 #endif /* CONFIG_HAVE_RCU_TABLE_FREE */
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
+void dmac_flush_range(const void *start, const void *end)
+{
+	__dma_flush_range(start, end);
+}
+EXPORT_SYMBOL(dmac_flush_range);
+
+void dmac_inv_range(const void *start, const void *end)
+{
+	__dma_inv_range(start, end);
+}
+EXPORT_SYMBOL(dmac_inv_range);
+
+void dmac_clean_range(const void *start, const void *end)
+{
+	__dma_clean_range(start, end);
+}
+EXPORT_SYMBOL(dmac_clean_range);