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powerpc/boot: Disable vector instructions

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[ Upstream commit e8e132e688 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Joel Stanley 2018-10-10 13:15:22 +10:30 committed by Greg Kroah-Hartman
parent 5346c84037
commit 16e4657a1d
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/boot/Makefile
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@ -32,8 +32,8 @@ else
endif
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)
ifdef CONFIG_PPC64_BOOT_WRAPPER