Hi Song,

I love your patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Song-Liu/introduce-BPF_PROG_TYPE_USER/20200801-165208
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-randconfig-a001-20200731 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> ld: kernel/bpf/syscall.o:(.rodata+0xcbc): undefined reference to `user_prog_ops'
>> ld: kernel/bpf/verifier.o:(.rodata+0x115c): undefined reference to `user_verifier_ops'

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0-DAY CI Kernel Test Service, Intel Corporation
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