[jolsa-perf:bpf/ftrace 2/6] kernel/bpf/syscall.c:2931: undefined reference to `__bpf_prog_enter'

[jolsa-perf:bpf/ftrace 2/6] kernel/bpf/syscall.c:2931: undefined reference to `__bpf_prog_enter'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/ftrace
head:   f6ca0faab8697bc6a3a6e4ffcb72b8a0a0a66558
commit: e201e5e6b442644c28e6c9a001ef2b7e4428aa51 [2/6] bpf: Add bpf ftrace link
config: x86_64-kexec (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id=e201e5e6b442644c28e6c9a001ef2b7e4428aa51
        git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
        git fetch --no-tags jolsa-perf bpf/ftrace
        git checkout e201e5e6b442644c28e6c9a001ef2b7e4428aa51
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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: in function `bpf_ftrace_function_call':
>> kernel/bpf/syscall.c:2931: undefined reference to `__bpf_prog_enter'
>> ld: kernel/bpf/syscall.c:2935: undefined reference to `__bpf_prog_exit'


vim +2931 kernel/bpf/syscall.c

  2919	
  2920	static void
  2921	bpf_ftrace_function_call(unsigned long ip, unsigned long parent_ip,
  2922				 struct ftrace_ops *ops,  struct ftrace_regs *fregs)
  2923	{
  2924		struct bpf_tracing_ftrace_link *tr_link;
  2925		struct bpf_prog *prog;
  2926		u64 start;
  2927	
  2928		tr_link = container_of(ops, struct bpf_tracing_ftrace_link, ops);
  2929		prog = tr_link->link.prog;
  2930	
> 2931		start = __bpf_prog_enter(prog);
  2932		if (start)
  2933			bpf_trace_run2(tr_link->link.prog, ip, parent_ip);
  2934	
> 2935		__bpf_prog_exit(prog, start);
  2936	}
  2937	

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

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