[josef-btrfs:bpf-override-return 1/2] bpf_trace.c:undefined reference to `trace_kprobe_ftrace'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git 
bpf-override-return
head:   4c8ff03808e83b25a9771d1171741d550072ba36
commit: 4608d4f4e271703f1609a78c9c0ac2f5d1fb59a2 [1/2] bpf: add a 
bpf_override_function helper
config: i386-randconfig-x0-11020159 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 4608d4f4e271703f1609a78c9c0ac2f5d1fb59a2
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   kernel/trace/bpf_trace.o: In function `perf_event_attach_bpf_prog':
>> bpf_trace.c:(.text+0xe43): undefined reference to `trace_kprobe_ftrace'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

.config.gz
Description: application/gzip