diff --git a/arch/s390/include/asm/checksum.h b/arch/s390/include/asm/checksum.h
index b89159591ca0..46f5c9660616 100644
--- a/arch/s390/include/asm/checksum.h
+++ b/arch/s390/include/asm/checksum.h
@@ -13,6 +13,7 @@
 #define _S390_CHECKSUM_H
 
 #include <linux/instrumented.h>
+#include <linux/kmsan-checks.h>
 #include <linux/in6.h>
 
 static inline __wsum cksm(const void *buff, int len, __wsum sum)
@@ -23,6 +24,7 @@ static inline __wsum cksm(const void *buff, int len, __wsum sum)
 	};
 
 	instrument_read(buff, len);
+	kmsan_check_memory(buff, len);
 	asm volatile("\n"
 		"0:	cksm	%[sum],%[rp]\n"
 		"	jo	0b\n"