D53232.id164723.diff
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	diff --git a/sys/riscv/include/atomic.h b/sys/riscv/include/atomic.h
	--- a/sys/riscv/include/atomic.h
	+++ b/sys/riscv/include/atomic.h
	@@ -37,10 +37,11 @@

	#include <sys/atomic_common.h>

	-#define fence() __asm __volatile("fence" ::: "memory");
	-#define mb() fence()
	-#define rmb() fence()
	-#define wmb() fence()
	+#define _fence(PRE, SUC) __asm __volatile("fence "#PRE","#SUC ::: "memory");
	+#define fence() _fence(rw, rw)
	+#define mb() _fence(rw, rw)
	+#define rmb() _fence(r, r)
	+#define wmb() _fence(w, w)

	static __inline int atomic_cmpset_8(__volatile uint8_t *, uint8_t, uint8_t);
	static __inline int atomic_fcmpset_8(__volatile uint8_t , uint8_t , uint8_t);