linux-kernel - Re: [PATCH v3 1/4] ARM: remove lazy evaluation in Makefile

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Date:   Mon, 16 May 2022 14:15:17 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Arnd Bergmann <arnd@...db.de>, Ard Biesheuvel <ardb@...nel.org>
Cc:     Russell King <rmk+kernel@...linux.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v3 1/4] ARM: remove lazy evaluation in Makefile

+ Ard (I messed up my command line invocation of git send-email, sorry
for more noise)
https://lore.kernel.org/llvm/20220516210954.1660716-1-ndesaulniers@google.com/

On Mon, May 16, 2022 at 2:10 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> arch-y and tune-y used lazy evaluation since they used to contain
> cc-option checks. They don't any longer, so just eagerly evaluate these
> command line flags.
>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  arch/arm/Makefile | 60 +++++++++++++++++++++--------------------------
>  1 file changed, 27 insertions(+), 33 deletions(-)
>
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index a2391b8de5a5..99a7ed7e9f09 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -60,44 +60,38 @@ KBUILD_CFLAGS       += $(call cc-option,-fno-ipa-sra)
>  # Note that GCC does not numerically define an architecture version
>  # macro, but instead defines a whole series of macros which makes
>  # testing for a specific architecture or later rather impossible.
> -arch-$(CONFIG_CPU_32v7M)       =-D__LINUX_ARM_ARCH__=7 -march=armv7-m
> -arch-$(CONFIG_CPU_32v7)                =-D__LINUX_ARM_ARCH__=7 -march=armv7-a
> -arch-$(CONFIG_CPU_32v6)                =-D__LINUX_ARM_ARCH__=6 -march=armv6
> -# Only override the compiler option if ARMv6. The ARMv6K extensions are
> +arch-$(CONFIG_CPU_32v7M)       :=-D__LINUX_ARM_ARCH__=7 -march=armv7-m
> +arch-$(CONFIG_CPU_32v7)                :=-D__LINUX_ARM_ARCH__=7 -march=armv7-a
> +arch-$(CONFIG_CPU_32v6)                :=-D__LINUX_ARM_ARCH__=6 -march=armv6
> +# Only override the compiler opt:ion if ARMv6. The ARMv6K extensions are
>  # always available in ARMv7
>  ifeq ($(CONFIG_CPU_32v6),y)
> -arch-$(CONFIG_CPU_32v6K)       =-D__LINUX_ARM_ARCH__=6 -march=armv6k
> +arch-$(CONFIG_CPU_32v6K)       :=-D__LINUX_ARM_ARCH__=6 -march=armv6k
>  endif
> -arch-$(CONFIG_CPU_32v5)                =-D__LINUX_ARM_ARCH__=5 -march=armv5te
> -arch-$(CONFIG_CPU_32v4T)       =-D__LINUX_ARM_ARCH__=4 -march=armv4t
> -arch-$(CONFIG_CPU_32v4)                =-D__LINUX_ARM_ARCH__=4 -march=armv4
> -arch-$(CONFIG_CPU_32v3)                =-D__LINUX_ARM_ARCH__=3 -march=armv3m
> -
> -# Evaluate arch cc-option calls now
> -arch-y := $(arch-y)
> +arch-$(CONFIG_CPU_32v5)                :=-D__LINUX_ARM_ARCH__=5 -march=armv5te
> +arch-$(CONFIG_CPU_32v4T)       :=-D__LINUX_ARM_ARCH__=4 -march=armv4t
> +arch-$(CONFIG_CPU_32v4)                :=-D__LINUX_ARM_ARCH__=4 -march=armv4
> +arch-$(CONFIG_CPU_32v3)                :=-D__LINUX_ARM_ARCH__=3 -march=armv3m
>
>  # This selects how we optimise for the processor.
> -tune-$(CONFIG_CPU_ARM7TDMI)    =-mtune=arm7tdmi
> -tune-$(CONFIG_CPU_ARM720T)     =-mtune=arm7tdmi
> -tune-$(CONFIG_CPU_ARM740T)     =-mtune=arm7tdmi
> -tune-$(CONFIG_CPU_ARM9TDMI)    =-mtune=arm9tdmi
> -tune-$(CONFIG_CPU_ARM940T)     =-mtune=arm9tdmi
> -tune-$(CONFIG_CPU_ARM946E)     =-mtune=arm9e
> -tune-$(CONFIG_CPU_ARM920T)     =-mtune=arm9tdmi
> -tune-$(CONFIG_CPU_ARM922T)     =-mtune=arm9tdmi
> -tune-$(CONFIG_CPU_ARM925T)     =-mtune=arm9tdmi
> -tune-$(CONFIG_CPU_ARM926T)     =-mtune=arm9tdmi
> -tune-$(CONFIG_CPU_FA526)       =-mtune=arm9tdmi
> -tune-$(CONFIG_CPU_SA110)       =-mtune=strongarm110
> -tune-$(CONFIG_CPU_SA1100)      =-mtune=strongarm1100
> -tune-$(CONFIG_CPU_XSCALE)      =-mtune=xscale
> -tune-$(CONFIG_CPU_XSC3)                =-mtune=xscale
> -tune-$(CONFIG_CPU_FEROCEON)    =-mtune=xscale
> -tune-$(CONFIG_CPU_V6)          =-mtune=arm1136j-s
> -tune-$(CONFIG_CPU_V6K)         =-mtune=arm1136j-s
> -
> -# Evaluate tune cc-option calls now
> -tune-y := $(tune-y)
> +tune-$(CONFIG_CPU_ARM7TDMI)    :=-mtune=arm7tdmi
> +tune-$(CONFIG_CPU_ARM720T)     :=-mtune=arm7tdmi
> +tune-$(CONFIG_CPU_ARM740T)     :=-mtune=arm7tdmi
> +tune-$(CONFIG_CPU_ARM9TDMI)    :=-mtune=arm9tdmi
> +tune-$(CONFIG_CPU_ARM940T)     :=-mtune=arm9tdmi
> +tune-$(CONFIG_CPU_ARM946E)     :=-mtune=arm9e
> +tune-$(CONFIG_CPU_ARM920T)     :=-mtune=arm9tdmi
> +tune-$(CONFIG_CPU_ARM922T)     :=-mtune=arm9tdmi
> +tune-$(CONFIG_CPU_ARM925T)     :=-mtune=arm9tdmi
> +tune-$(CONFIG_CPU_ARM926T)     :=-mtune=arm9tdmi
> +tune-$(CONFIG_CPU_FA526)       :=-mtune=arm9tdmi
> +tune-$(CONFIG_CPU_SA110)       :=-mtune=strongarm110
> +tune-$(CONFIG_CPU_SA1100)      :=-mtune=strongarm1100
> +tune-$(CONFIG_CPU_XSCALE)      :=-mtune=xscale
> +tune-$(CONFIG_CPU_XSC3)                :=-mtune=xscale
> +tune-$(CONFIG_CPU_FEROCEON)    :=-mtune=xscale
> +tune-$(CONFIG_CPU_V6)          :=-mtune=arm1136j-s
> +tune-$(CONFIG_CPU_V6K)         :=-mtune=arm1136j-s
>
>  ifeq ($(CONFIG_AEABI),y)
>  CFLAGS_ABI     :=-mabi=aapcs-linux -mfpu=vfp
> --
> 2.36.0.550.gb090851708-goog
>


-- 
Thanks,
~Nick Desaulniers