Re: [PATCH bpf-next 1/5] perf/core: Add PERF_FORMAT_LOST read_format

Hi Daniel,

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/Daniel-Xu/perf-core-Add-PERF_FORMAT_LOST-read_format/20190917-213515
base:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-11) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All errors (new ones prefixed by >>):

   kernel/events/core.c: In function 'perf_event_lost':

quoted

kernel/events/core.c:4753:11: error: implicit declaration of function 'perf_kprobe_missed'; did you mean 'perf_release'? [-Werror=implicit-function-declaration]

      lost += perf_kprobe_missed(event);
              ^~~~~~~~~~~~~~~~~~
              perf_release
   cc1: some warnings being treated as errors

vim +4753 kernel/events/core.c

  4739	
  4740	static struct pmu perf_kprobe;
  4741	static u64 perf_event_lost(struct perf_event *event)
  4742	{
  4743		struct ring_buffer *rb;
  4744		u64 lost = 0;
  4745	
  4746		rcu_read_lock();
  4747		rb = rcu_dereference(event->rb);
  4748		if (likely(!!rb))
  4749			lost += local_read(&rb->lost);
  4750		rcu_read_unlock();
  4751	
  4752		if (event->attr.type == perf_kprobe.type)

4753			lost += perf_kprobe_missed(event);

  4754	
  4755		return lost;
  4756	}
  4757	

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