diff --git a/sys/compat/linuxkpi/common/include/linux/compiler.h b/sys/compat/linuxkpi/common/include/linux/compiler.h
--- a/sys/compat/linuxkpi/common/include/linux/compiler.h
+++ b/sys/compat/linuxkpi/common/include/linux/compiler.h
@@ -101,16 +101,18 @@
 #define	___PASTE(a,b) a##b
 #define	__PASTE(a,b) ___PASTE(a,b)
 
+#define	ACCESS_ONCE(x)			(*(volatile __typeof(x) *)(uintptr_t)&(x))
+
 #define	WRITE_ONCE(x,v) do {		\
 	barrier();			\
-	(*(volatile __typeof(x) *)(uintptr_t)&(x)) = (v); \
+	ACCESS_ONCE(x) = (v);		\
 	barrier();			\
 } while (0)
 
 #define	READ_ONCE(x) ({			\
 	__typeof(x) __var = ({		\
 		barrier();		\
-		(*(const volatile __typeof(x) *)&(x)); \
+		ACCESS_ONCE(x);		\
 	});				\
 	barrier();			\
 	__var;				\