netdev - Re: arm-linux-gnueabi-ld: error: .btf.vmlinux.bin.o is already in final BE8 format

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Message-ID: <CAK8P3a3dvzLhAGV8rdCpX__54vkL0=e5pACUY-es3xiJau=uwg@mail.gmail.com>
Date:   Tue, 14 Jun 2022 18:20:25 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     kernel test robot <lkp@...el.com>
Cc:     Arnd Bergmann <arnd@...db.de>, kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Networking <netdev@...r.kernel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: arm-linux-gnueabi-ld: error: .btf.vmlinux.bin.o is already in
 final BE8 format

On Sat, Jun 11, 2022 at 11:00 PM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   0678afa6055d14799c1dc1eee47c8025eba56cab
> commit: 5d6f52671e76ca2d55d74e676ac4c38ceb14a2d3 ARM: rework endianess selection
> date:   9 weeks ago
> configrong.a.chen@...el.com: arm-randconfig-r012-20220612 (https://download.01.org/0day-ci/archive/20220612/202206120438.Un6Wq4N0-lkp@intel.com/config)
> compiler: arm-linux-gnueabi-gcc (GCC) 11.3.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5d6f52671e76ca2d55d74e676ac4c38ceb14a2d3
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 5d6f52671e76ca2d55d74e676ac4c38ceb14a2d3
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> >> arm-linux-gnueabi-ld: error: .btf.vmlinux.bin.o is already in final BE8 format
>    arm-linux-gnueabi-ld: failed to merge target specific data of file .btf.vmlinux.bin.o

I had a look at this bug, and found that this is not caused by my commit, but
rather is the result of CONFIG_CPU_BIG_ENDIAN with BE8 format being
incompatible with CONFIG_DEBUG_INFO_BTF.

I'm sure there is an easy fix but I have not found it. Should we just
add a Kconfig
dependency to prevent this, or does anyone have an idea for a proper fix?

          Arnd