s390/ebcdic: Use exrl instead of ex

exrl is present in all machines currently supported, therefore prefer
it over ex. This saves one instruction and doesn't need an additional
register to hold the address of the target instruction.

Signed-off-by: Sven Schnelle <[email protected]>
Reviewed-by: Heiko Carstens <[email protected]>
Signed-off-by: Alexander Gordeev <[email protected]>

Author: svens-s390

arch/s390/include/asm/ebcdic.h

@@ -25,15 +25,15 @@ codepage_convert(const __u8 *codepage, volatile char *addr, unsigned long nr)
 	if (nr-- <= 0)
 		return;
 	asm volatile(
-		"	bras	1,1f\n"
-		"	tr	0(1,%0),0(%2)\n"
-		"0:	tr	0(256,%0),0(%2)\n"
+		"	j	2f\n"
+		"0:	tr	0(1,%0),0(%2)\n"
+		"1:	tr	0(256,%0),0(%2)\n"
 		"	la	%0,256(%0)\n"
-		"1:	ahi	%1,-256\n"
-		"	jnm	0b\n"
-		"	ex	%1,0(1)"
+		"2:	ahi	%1,-256\n"
+		"	jnm	1b\n"
+		"	exrl	%1,0b"
 		: "+&a" (addr), "+&a" (nr)
-		: "a" (codepage) : "cc", "memory", "1");
+		: "a" (codepage) : "cc", "memory");
 }
 
 #define ASCEBC(addr,nr) codepage_convert(_ascebc, addr, nr)