From: Sven Schnelle <svens@linux.ibm.com>
Date: Wed, 8 Jan 2025 14:27:03 +0000 (+0100)
Subject: s390/amode31: Use exrl instead of ex
X-Git-Tag: v6.14-rc1~200^2~7
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=90c5515dcb9c824db244f42a98c765bd0542f109;p=thirdparty%2Fkernel%2Flinux.git

s390/amode31: 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 <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
---

diff --git a/arch/s390/kernel/text_amode31.S b/arch/s390/kernel/text_amode31.S
index c0a70efa2426d..26f2981aa09e3 100644
--- a/arch/s390/kernel/text_amode31.S
+++ b/arch/s390/kernel/text_amode31.S
@@ -18,8 +18,7 @@
  * affects a few functions that are not performance-relevant.
  */
 	.macro BR_EX_AMODE31_r14
-	larl	%r1,0f
-	ex	0,0(%r1)
+	exrl	0,0f
 	j	.
 0:	br	%r14
 	.endm