s390/entry: align system call table on 8 bytes

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>

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 787394978bc0f86400ce30214c2e1b8eb3e82675..3dc85638bc63b7d96eb3ebc25c558cff967395c6 100644 (file)
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -635,6 +635,7 @@ 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"