linux-kernel - Re: [PATCH 1/2] x86, Makefile: Move the CPU-specific 64-bit tuning settings to arch/x86/Makefile.cpu

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Message-ID: <CAK7LNAQQh6kM3k4=UP9R1HQ5+QWzRZZ1Cse_nWv8nOOSkJ93wQ@mail.gmail.com>
Date:   Wed, 18 Aug 2021 23:51:44 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Tor Vic <torvic9@...lbox.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH 1/2] x86, Makefile: Move the CPU-specific 64-bit tuning
 settings to arch/x86/Makefile.cpu

On Tue, Aug 17, 2021 at 11:23 PM torvic9 via Clang Built Linux
<clang-built-linux@...glegroups.com> wrote:
>
> In accordance with the FIXME comment in arch/x86/Makefile, move the
> CPU-specific 64-bit tuning settings to arch/x86/Makefile.cpu.
>
> Signed-off-by: Tor Vic <torvic9@...lbox.org>
> ---
>  arch/x86/Makefile     | 11 ++---------
>  arch/x86/Makefile.cpu | 12 ++++++++++++
>  2 files changed, 14 insertions(+), 9 deletions(-)
>  create mode 100644 arch/x86/Makefile.cpu
>
> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> index 307fd0000a83..94105d7ad22c 100644
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -119,15 +119,8 @@ else
>         # Use -mskip-rax-setup if supported.
>         KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
>
> -        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
> -        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
> -        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
> -
> -        cflags-$(CONFIG_MCORE2) += \
> -                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
> -       cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
> -               $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
> -        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
> +        # CPU-specific tuning (64-bit).
> +        include arch/x86/Makefile.cpu




See
https://patchwork.kernel.org/project/linux-kbuild/patch/20210724183556.76680-1-masahiroy@kernel.org/





>          KBUILD_CFLAGS += $(cflags-y)
>
>          KBUILD_CFLAGS += -mno-red-zone
> diff --git a/arch/x86/Makefile.cpu b/arch/x86/Makefile.cpu
> new file mode 100644
> index 000000000000..fb407ae94d90
> --- /dev/null
> +++ b/arch/x86/Makefile.cpu
> @@ -0,0 +1,12 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# CPU tuning section (64-bit) - shared with UML.
> +# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.
> +
> +cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
> +cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
> +
> +cflags-$(CONFIG_MCORE2) += \
> +       $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
> +cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
> +       $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
> +cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
> --
> 2.32.0
>
> --
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-- 
Best Regards
Masahiro Yamada