powerpc/boot: Disable vector instructions

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>

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 5d5ab6e..a90197f 100644 (file)
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -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