linux-kernel - Re: [PATCH 1/3] powerpc: make CPU selection logic generic in Makefile

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Date:   Fri, 8 Jun 2018 11:54:29 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/3] powerpc: make CPU selection logic generic in
 Makefile

On Thu,  7 Jun 2018 10:10:18 +0000 (UTC)
Christophe Leroy <christophe.leroy@....fr> wrote:

> At the time being, when adding a new CPU for selection, both
> Kconfig.cputype and Makefile have to be modified.
> 
> This patch moves into Kconfig.cputype the name of the CPU to me
> passed to the -mcpu= argument.

Seems like a good cleanup.

Reviewed-by: Nicholas Piggin <npiggin@...il.com>

> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
>  arch/powerpc/Makefile                  |  8 +-------
>  arch/powerpc/platforms/Kconfig.cputype | 15 +++++++++++++++
>  2 files changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 9704ab360d39..9a5642552abc 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -175,13 +175,7 @@ ifdef CONFIG_MPROFILE_KERNEL
>      endif
>  endif
>  
> -CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
> -CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
> -CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
> -CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
> -CFLAGS-$(CONFIG_POWER8_CPU) += $(call cc-option,-mcpu=power8)
> -CFLAGS-$(CONFIG_POWER9_CPU) += $(call cc-option,-mcpu=power9)
> -CFLAGS-$(CONFIG_PPC_8xx) += $(call cc-option,-mcpu=860)
> +CFLAGS-$(CONFIG_SPECIAL_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_SPECIAL_CPU))
>  
>  # Altivec option not allowed with e500mc64 in GCC.
>  ifeq ($(CONFIG_ALTIVEC),y)
> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
> index cc892dcfa114..71ef559cc474 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -140,6 +140,21 @@ config E6500_CPU
>  
>  endchoice
>  
> +config SPECIAL_CPU_BOOL
> +	bool
> +	default !GENERIC_CPU
> +
> +config SPECIAL_CPU
> +	string
> +	depends on SPECIAL_CPU_BOOL
> +	default "cell" if CELL_CPU
> +	default "power5" if POWER5_CPU
> +	default "power6" if POWER6_CPU
> +	default "power7" if POWER7_CPU
> +	default "power8" if POWER8_CPU
> +	default "power9" if POWER9_CPU
> +	default "860" if PPC_8xx
> +
>  config PPC_BOOK3S
>  	def_bool y
>  	depends on PPC_BOOK3S_32 || PPC_BOOK3S_64