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s390/linkage: increase asm symbols alignment to 16

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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>
This commit is contained in:
Vasily Gorbik 2021-06-30 10:21:58 +02:00
parent b55e692e6b
commit 4ee471fe5a
1 changed files with 1 additions and 1 deletions
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arch/s390/include/asm/linkage.h
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@ -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)
/*