netdev - Re: [PATCH bpf-next v3 2/7] bpf: per-cgroup lsm flavor

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Date:   Fri, 8 Apr 2022 09:42:05 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     netdev@...r.kernel.org, kernel test robot <lkp@...el.com>,
        bpf@...r.kernel.org, llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org
Subject: Re: [PATCH bpf-next v3 2/7] bpf: per-cgroup lsm flavor

On Fri, Apr 08, 2022 at 11:53:47PM +0800, kernel test robot wrote:
> Hi Stanislav,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on bpf-next/master]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Stanislav-Fomichev/bpf-cgroup_sock-lsm-flavor/20220408-063705
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
> config: x86_64-randconfig-a005 (https://download.01.org/0day-ci/archive/20220408/202204082305.Qs2g5Dzf-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c29a51b3a257908aebc01cd7c4655665db317d66)
> 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://github.com/intel-lab-lkp/linux/commit/3c3f15b5422ca616e2585d699c47aa4e7b7dcf1d
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Stanislav-Fomichev/bpf-cgroup_sock-lsm-flavor/20220408-063705
>         git checkout 3c3f15b5422ca616e2585d699c47aa4e7b7dcf1d
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
> >> ld.lld: error: undefined symbol: btf_obj_id
>    >>> referenced by trampoline.c
>    >>>               bpf/trampoline.o:(bpf_trampoline_link_cgroup_shim) in archive kernel/built-in.a
>    >>> referenced by trampoline.c
>    >>>               bpf/trampoline.o:(bpf_trampoline_unlink_cgroup_shim) in archive kernel/built-in.a
It is probably because obj-$(CONFIG_BPF_JIT) += trampoline.o
while obj-$(CONFIG_BPF_SYSCALL) += btf.o.

Good catch but seems minor and should not affect the review.
Please hold off the respin a little first so that the review
can continue on this revision.