[PATCH 5.4 171/215] s390/entry: align system call table on 8 bytes

Greg Kroah-Hartman
2024-04-11T10:22:24Z

From: Sumanth Korikkar <sumanthk@linux.ibm.com>

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>
---
arch/s390/kernel/entry.S | 1 +
1 file changed, 1 insertion(+)

--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -1542,6 +1542,7 @@ ENDPROC(cleanup_critical)
.quad .Lsie_skip - .Lsie_entry
#endif
.section .rodata, "a"
+ .balign 8
#define SYSCALL(esame,emu) .quad __s390x_ ## esame
.globl sys_call_table