v4.19.13 snapshot.
diff --git a/arch/alpha/include/asm/dma-mapping.h b/arch/alpha/include/asm/dma-mapping.h
new file mode 100644
index 0000000..8beeafd
--- /dev/null
+++ b/arch/alpha/include/asm/dma-mapping.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ALPHA_DMA_MAPPING_H
+#define _ALPHA_DMA_MAPPING_H
+
+extern const struct dma_map_ops alpha_pci_ops;
+
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+{
+#ifdef CONFIG_ALPHA_JENSEN
+ return &dma_direct_ops;
+#else
+ return &alpha_pci_ops;
+#endif
+}
+
+#endif /* _ALPHA_DMA_MAPPING_H */