diff --git a/arch/s390/include/asm/bug.h b/arch/s390/include/asm/bug.h
index 59017fd3d935..d8e65885e935 100644
--- a/arch/s390/include/asm/bug.h
+++ b/arch/s390/include/asm/bug.h
@@ -4,6 +4,7 @@
 
 #include <linux/compiler.h>
 #include <linux/const.h>
+#include <linux/stringify.h>
 
 #define	MONCODE_BUG	_AC(0, U)
 #define	MONCODE_BUG_ARG _AC(1, U)
@@ -121,6 +122,17 @@ do {									\
 #define HAVE_ARCH_BUG_FORMAT
 #define HAVE_ARCH_BUG_FORMAT_ARGS
 
+#define ARCH_WARN_ASM(file, line, flags, size)				\
+	".section .rodata.str,\"aMS\",@progbits,1\n"			\
+	"9:\n"								\
+	".asciz \"\"\n"		/* Empty string for compatibility */	\
+	".previous\n"							\
+	"0:\n"								\
+	__stringify(mc 0(%r0),0) "\n"					\
+	__BUG_ENTRY("9b", file, line, flags, size)
+
+#define ARCH_WARN_REACHABLE
+
 #endif /* CONFIG_BUG && CONFIG_CC_HAS_ASM_IMMEDIATE_STRINGS */
 #endif /* __ASSEMBLER__ */