Index: contrib/ofed/include/udma_barrier.h
===================================================================
--- contrib/ofed/include/udma_barrier.h	(revision 336593)
+++ contrib/ofed/include/udma_barrier.h	(working copy)
@@ -104,6 +104,10 @@
 #include <sys/types.h>
 #include <machine/atomic.h>
 #define udma_to_device_barrier() dmb()
+#elif defined(__riscv)
+#include <sys/types.h>
+#include <machine/atomic.h>
+#define udma_to_device_barrier() fence()
 #else
 #error No architecture specific memory barrier defines found!
 #endif
@@ -140,6 +144,8 @@
 #define udma_from_device_barrier() mips_sync()
 #elif defined(__arm__)
 #define udma_from_device_barrier() dmb()
+#elif defined(__riscv)
+#define udma_from_device_barrier() fence()
 #else
 #error No architecture specific memory barrier defines found!
 #endif
@@ -208,6 +214,8 @@
 #define mmio_flush_writes() mips_sync()
 #elif defined(__arm__)
 #define mmio_flush_writes() dmb()
+#elif defined(__riscv)
+#define mmio_flush_writes() fence()
 #else
 #error No architecture specific memory barrier defines found!
 #endif