Re: [PATCH bpf-next 1/2] bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_CGROUP_SOCKOPT

Hi Stanislav,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Stanislav-Fomichev/bpf-Allow-bpf_get_netns_cookie-in-BPF_PROG_TYPE_CGROUP_SOCKOPT/20210812-062850
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: riscv-randconfig-r026-20210811 (attached as .config)
compiler: riscv32-linux-gcc (GCC) 10.3.0
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://github.com/0day-ci/linux/commit/192e9ea84066a6ef07e9d1ce72e7f597b920ada2
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Stanislav-Fomichev/bpf-Allow-bpf_get_netns_cookie-in-BPF_PROG_TYPE_CGROUP_SOCKOPT/20210812-062850
        git checkout 192e9ea84066a6ef07e9d1ce72e7f597b920ada2
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   riscv32-linux-ld: kernel/bpf/cgroup.o: in function `.L31':

quoted

cgroup.c:(.text+0x240): undefined reference to `init_net'
riscv32-linux-ld: cgroup.c:(.text+0x244): undefined reference to `init_net'

   riscv32-linux-ld: cgroup.c:(.text+0x248): undefined reference to `init_net'

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org