]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commitdiff
s390/linkage: increase asm symbols alignment to 16
authorVasily Gorbik <gor@linux.ibm.com>
Wed, 30 Jun 2021 08:21:58 +0000 (10:21 +0200)
committerVasily Gorbik <gor@linux.ibm.com>
Thu, 8 Jul 2021 20:12:18 +0000 (22:12 +0200)
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>
arch/s390/include/asm/linkage.h

index a0a7a2c72bd4f9a405b935a217b6b817337428b1..24e8fed150cf8b2d73cb068cbf11a69a63844756 100644 (file)
@@ -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)
 
 /*