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Message-ID: <20220408164205.kvccyzkvsc3oef65@kafai-mbp.dhcp.thefacebook.com>
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.
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