linux-kernel - Re: [PATCH v2] Make iwmmxt.S support Clang's integrated assembler

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Date:   Tue, 10 Nov 2020 12:11:24 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Jian Cai <jiancai@...gle.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Manoj Gupta <manojgupta@...gle.com>,
        Luis Lozano <llozano@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Russell King <linux@...linux.org.uk>,
        Nathan Chancellor <natechancellor@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] Make iwmmxt.S support Clang's integrated assembler

On Tue, Nov 10, 2020 at 12:10 PM Jian Cai <jiancai@...gle.com> wrote:
>
> I tried to verify with ixp4xx_defconfig, and I noticed it also used CONFIG_CPU_BIG_ENDIAN=y to enable big endianness as follows,
>
> linux$ grep ENDIAN arch/arm/configs/ixp4xx_defconfig
> CONFIG_CPU_BIG_ENDIAN=y
>
> Also it appeared arch/arm/kernel/iwmmxt.o was not built with ixp4xx_defconfig. The commands I used
>
> linux$ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make CC=clang ixp4xx_defconfig
> linux$ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make -j32 CC=clang
> linux$ ls arch/arm/kernel/iwmmxt.o
> ls: cannot access 'arch/arm/kernel/iwmmxt.o': No such file or directory
>
> Did I miss any steps?

Yes, you need to manually enable CONFIG_IWMMXT in menuconfig or via
`scripts/configs -e`.

-- 
Thanks,
~Nick Desaulniers