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    Subject[PATCH 5.4 175/255] powerpc/64s: Fix GENERIC_CPU build flags for PPC970 / G5
    Date
    From: Nicholas Piggin <npiggin@gmail.com>

    [ Upstream commit 58ec7f06b74e0d6e76c4110afce367c8b5f0837d ]

    Big-endian GENERIC_CPU supports 970, but builds with -mcpu=power5.
    POWER5 is ISA v2.02 whereas 970 is v2.01 plus Altivec. 2.02 added
    the popcntb instruction which a compiler might use.

    Use -mcpu=power4.

    Fixes: 471d7ff8b51b ("powerpc/64s: Remove POWER4 support")
    Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
    Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Link: https://lore.kernel.org/r/20220921014103.587954-1-npiggin@gmail.com
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/powerpc/Makefile | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
    index eedd114a017c..95183a717eb6 100644
    --- a/arch/powerpc/Makefile
    +++ b/arch/powerpc/Makefile
    @@ -155,7 +155,7 @@ CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
    CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
    else
    CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
    -CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
    +CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power4
    endif
    else ifdef CONFIG_PPC_BOOK3E_64
    CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
    --
    2.35.1


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