Le 21/09/2022 à 03:41, Nicholas Piggin a écrit :
> 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 <npig...@gmail.com>
> ---
> arch/powerpc/Makefile | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 02742facf895..140a5e6471fe 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -152,7 +152,7 @@ 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
That else ifdef CONFIG_PPC_BOOK3E_64 looks odd.
I might have forgotten to drop something. Since commit d6b551b8f90c
("powerpc/64e: Fix build failure with GCC 12 (unrecognized opcode:
`wrteei')") it is not possible anymore to select CONFIG_GENERIC_CPU if
not book3s64.
Christophe
