Add a KMSAN check to the CKSM inline assembly, similar to how it was
done for ASAN in commit e42ac7789df6 ("s390/checksum: always use cksm
instruction").

Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 arch/s390/include/asm/checksum.h | 2 ++
 1 file changed, 2 insertions(+)

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"
-- 
2.45.1