From: Vasily Gorbik <gor@linux.ibm.com>
Date: Wed, 30 Jun 2021 08:21:58 +0000 (+0200)
Subject: s390/linkage: increase asm symbols alignment to 16
X-Git-Tag: v5.15~742^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4ee471fe5a5a891ac4fcd45b5457fcb17de694de;p=platform%2Fkernel%2Flinux-starfive.git

s390/linkage: increase asm symbols alignment to 16

Both clang and gcc (for -march=z13 and later) align functions to 16
bytes at -O2 to benefit branch prediction.

Make asm symbols alignment consistent with that.

This also benefits potential ftrace code patching, which is currently
able to patch 8 aligned bytes at once.

With defconfig this currently increases .text size by 4104 bytes.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---

diff --git a/arch/s390/include/asm/linkage.h b/arch/s390/include/asm/linkage.h
index a0a7a2c..24e8fed 100644
--- a/arch/s390/include/asm/linkage.h
+++ b/arch/s390/include/asm/linkage.h
@@ -5,7 +5,7 @@
 #include <asm/asm-const.h>
 #include <linux/stringify.h>
 
-#define __ALIGN .align 4, 0x07
+#define __ALIGN .align 16, 0x07
 #define __ALIGN_STR __stringify(__ALIGN)
 
 /*