linux-kernel - Re: [PATCH] ARM: Kconfig: CPU_BIG_ENDIAN depends on !LD_IS

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Message-ID: <20201110013419.GA2443932@ubuntu-m3-large-x86>
Date:   Mon, 9 Nov 2020 18:34:19 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Arnd Bergmann <arnd@...nel.org>, Fangrui Song <maskray@...gle.com>,
        Jian Cai <jiancai@...gle.com>,
        Peter Smith <peter.smith@....com>,
        Russell King <linux@...linux.org.uk>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] ARM: Kconfig: CPU_BIG_ENDIAN depends on !LD_IS_LLD

On Mon, Nov 09, 2020 at 02:47:12PM -0800, Nick Desaulniers wrote:
> LLD does not yet support any big endian architectures. Make this config
> non-selectable when using LLD until LLD is fixed.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/965
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

I tested allyesconfig, allmodconfig, and about ten to fifteen
randconfigs and never saw CONFIG_CPU_BIG_ENDIAN appear.

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
Tested-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  arch/arm/mm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
> index 65e4482e3849..02692fbe2db5 100644
> --- a/arch/arm/mm/Kconfig
> +++ b/arch/arm/mm/Kconfig
> @@ -743,6 +743,7 @@ config SWP_EMULATE
>  config CPU_BIG_ENDIAN
>  	bool "Build big-endian kernel"
>  	depends on ARCH_SUPPORTS_BIG_ENDIAN
> +	depends on !LD_IS_LLD
>  	help
>  	  Say Y if you plan on running a kernel in big-endian mode.
>  	  Note that your board must be properly built and your board
> -- 
> 2.29.2.222.g5d2a92d10f8-goog
>