Re: [PATCH net-next 2/3] bpf: permit multiple bpf attachments for a single perf event

Hi Yonghong,

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

url:    https://github.com/0day-ci/linux/commits/Yonghong-Song/bpf-permit-multiple-bpf-attachments-for-a-single-perf-tracepoint-event/20171024-080608
config: arm-omap2plus_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   kernel/events/core.o: In function `_free_event':

quoted

kernel/events/core.c:8193: undefined reference to `perf_event_detach_bpf_prog'
kernel/events/core.o:(.debug_addr+0x25c): undefined reference to `perf_event_detach_bpf_prog'

vim +8193 kernel/events/core.c

  8186	
  8187	static void perf_event_free_bpf_prog(struct perf_event *event)
  8188	{
  8189		if (event->attr.type != PERF_TYPE_TRACEPOINT) {
  8190			perf_event_free_bpf_handler(event);
  8191			return;
  8192		}

8193		perf_event_detach_bpf_prog(event);

  8194	}
  8195	

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