4.14-stable review patch. If anyone has any objections, please let me know.
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From: Joel Stanley joel@jms.id.au
commit e213574a449f7a57d4202c1869bbc7680b6b5521 upstream.
We cannot build these files with clang as it does not allow altivec instructions in assembly when -msoft-float is passed.
Jinsong Ji jji@us.ibm.com wrote:
We currently disable Altivec/VSX support when enabling soft-float. So any usage of vector builtins will break.
Enable Altivec/VSX with soft-float may need quite some clean up work, so I guess this is currently a limitation.
Removing -msoft-float will make it work (and we are lucky that no floating point instructions will be generated as well).
This is a workaround until the issue is resolved in clang.
Link: https://bugs.llvm.org/show_bug.cgi?id=31177 Link: https://github.com/ClangBuiltLinux/linux/issues/239 Signed-off-by: Joel Stanley joel@jms.id.au Reviewed-by: Nick Desaulniers ndesaulniers@google.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au [nc: Use 'ifeq ($(cc-name),clang)' instead of 'ifdef CONFIG_CC_IS_CLANG' because that config does not exist in 4.14; the Kconfig rewrite that added that config happened in 4.18] Signed-off-by: Nathan Chancellor natechancellor@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- lib/raid6/Makefile | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
--- a/lib/raid6/Makefile +++ b/lib/raid6/Makefile @@ -18,6 +18,21 @@ quiet_cmd_unroll = UNROLL $@
ifeq ($(CONFIG_ALTIVEC),y) altivec_flags := -maltivec $(call cc-option,-mabi=altivec) + +ifeq ($(cc-name),clang) +# clang ppc port does not yet support -maltivec when -msoft-float is +# enabled. A future release of clang will resolve this +# https://bugs.llvm.org/show_bug.cgi?id=31177 +CFLAGS_REMOVE_altivec1.o += -msoft-float +CFLAGS_REMOVE_altivec2.o += -msoft-float +CFLAGS_REMOVE_altivec4.o += -msoft-float +CFLAGS_REMOVE_altivec8.o += -msoft-float +CFLAGS_REMOVE_altivec8.o += -msoft-float +CFLAGS_REMOVE_vpermxor1.o += -msoft-float +CFLAGS_REMOVE_vpermxor2.o += -msoft-float +CFLAGS_REMOVE_vpermxor4.o += -msoft-float +CFLAGS_REMOVE_vpermxor8.o += -msoft-float +endif endif
# The GCC option -ffreestanding is required in order to compile code containing