linux-kernel - Re: [PATCH net-next 2/2] bpf: add event output helper for notifications/sampling/logging

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Date:	Mon, 18 Apr 2016 07:55:08 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Daniel Borkmann <daniel@...earbox.net>
Cc:	kbuild-all@...org, davem@...emloft.net,
	alexei.starovoitov@...il.com, tgraf@...g.ch,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Daniel Borkmann <daniel@...earbox.net>,
	Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH net-next 2/2] bpf: add event output helper for
 notifications/sampling/logging

Hi Daniel,

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

url:    https://github.com/0day-ci/linux/commits/Daniel-Borkmann/bpf-trace-add-BPF_F_CURRENT_CPU-flag-for-bpf_perf_event_output/20160418-063147
config: m68k-allyesconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   net/core/filter.c: In function 'bpf_skb_event_output':
>> net/core/filter.c:1599:2: error: implicit declaration of function 'perf_fetch_caller_regs' [-Werror=implicit-function-declaration]
     perf_fetch_caller_regs(regs);
     ^
   cc1: some warnings being treated as errors

vim +/perf_fetch_caller_regs +1599 net/core/filter.c

  1593	static DEFINE_PER_CPU(struct pt_regs, bpf_pt_regs);
  1594	
  1595	static u64 bpf_skb_event_output(u64 r1, u64 r2, u64 flags, u64 r4, u64 size)
  1596	{
  1597		struct pt_regs *regs = this_cpu_ptr(&bpf_pt_regs);
  1598	
> 1599		perf_fetch_caller_regs(regs);
  1600	
  1601		return bpf_perf_event_output((long)regs, r2, flags, r4, size);
  1602	}

---
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