From e8e132e6885962582784b6fa16a80d07ea739c0f Mon Sep 17 00:00:00 2001
From: Joel Stanley <joel@jms.id.au>
Date: Wed, 10 Oct 2018 13:15:22 +1030
Subject: [PATCH] powerpc/boot: Disable vector instructions
References: bsc#1065729
Patch-mainline: v4.20-rc1
Git-commit: e8e132e6885962582784b6fa16a80d07ea739c0f
This will avoid auto-vectorisation when building with higher
optimisation levels.
We don't know if the machine can support VSX and even if it's present
it's probably not going to be enabled at this point in boot.
These flag were both added prior to GCC 4.6 which is the minimum
compiler version supported by upstream, thanks to Segher for the
details.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/boot/Makefile | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -32,8 +32,8 @@ else
compress-$(CONFIG_KERNEL_XZ) := CONFIG_KERNEL_XZ
BOOTCFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
- -fno-strict-aliasing -Os -msoft-float -pipe \
- -fomit-frame-pointer -fno-builtin -fPIC -nostdinc \
+ -fno-strict-aliasing -Os -msoft-float -mno-altivec -mno-vsx \
+ -pipe -fomit-frame-pointer -fno-builtin -fPIC -nostdinc \
-D$(compress-y)
BOOTCC := $(CC)
--
2.35.3