From: Sumanth Korikkar <sumanthk@linux.ibm.com>
Date: Tue, 26 Mar 2024 17:12:13 +0000 (+0100)
Subject: s390/entry: align system call table on 8 bytes
X-Git-Tag: v6.6.26~40
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3dcb2223b973887f6360780f17ef99be38c3bbd3;p=thirdparty%2Fkernel%2Fstable.git

s390/entry: align system call table on 8 bytes

commit 378ca2d2ad410a1cd5690d06b46c5e2297f4c8c0 upstream.

Align system call table on 8 bytes. With sys_call_table entry size
of 8 bytes that eliminates the possibility of a system call pointer
crossing cache line boundary.

Cc: stable@kernel.org
Suggested-by: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 49a11f6dd7ae9..26c08ee877407 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -653,6 +653,7 @@ SYM_DATA_START_LOCAL(daton_psw)
 SYM_DATA_END(daton_psw)
 
 	.section .rodata, "a"
+	.balign	8
 #define SYSCALL(esame,emu)	.quad __s390x_ ## esame
 SYM_DATA_START(sys_call_table)
 #include "asm/syscall_table.h"