From a0ae5cd235cc32daa0aeb58fa466da2f1042fc8e Mon Sep 17 00:00:00 2001
From: Heiko Carstens <hca@linux.ibm.com>
Date: Thu, 1 Jul 2021 12:28:48 +0200
Subject: [PATCH] s390/lib,string: fix strcat() inline asm constraint modifier
"dummy" is not only used as output but also as input. Therefore use
the correct "+" constraint modifier.
Fixes: 8cf23c8e1fec ("s390/lib,string: get rid of register asm")
Reported-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---
arch/s390/lib/string.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/lib/string.c b/arch/s390/lib/string.c
index ec5b76bde4d8d..cfcdf76d6a957 100644
--- a/arch/s390/lib/string.c
+++ b/arch/s390/lib/string.c
@@ -162,7 +162,7 @@ char *strcat(char *dest, const char *src)
" jo 0b\n"
"1: mvst %[dummy],%[src]\n"
" jo 1b\n"
- : [dummy] "=&a" (dummy), [dest] "+&a" (dest), [src] "+&a" (src)
+ : [dummy] "+&a" (dummy), [dest] "+&a" (dest), [src] "+&a" (src)
:
: "cc", "memory", "0");
return ret;