linux-kernel - [ammarfaizi2-block:bpf/bpf-next/pr/bpf-sysctl 1/1] kernel/bpf/syscall.c:4944:13: warning: no previous prototype for 'unpriv_ebpf

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Date:   Thu, 14 Apr 2022 06:42:57 +0800
From:   kernel test robot <lkp@...el.com>
To:     Yan Zhu <zhuyan34@...wei.com>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [ammarfaizi2-block:bpf/bpf-next/pr/bpf-sysctl 1/1]
 kernel/bpf/syscall.c:4944:13: warning: no previous prototype for
 'unpriv_ebpf_notify'

tree:   https://github.com/ammarfaizi2/linux-block bpf/bpf-next/pr/bpf-sysctl
head:   2900005ea287b11dcc8c1b9fcf24893b7ff41d6d
commit: 2900005ea287b11dcc8c1b9fcf24893b7ff41d6d [1/1] bpf: Move BPF sysctls from kernel/sysctl.c to BPF core
config: sh-buildonly-randconfig-r001-20220413 (https://download.01.org/0day-ci/archive/20220414/202204140614.Tt9e1fIt-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/ammarfaizi2/linux-block/commit/2900005ea287b11dcc8c1b9fcf24893b7ff41d6d
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block bpf/bpf-next/pr/bpf-sysctl
        git checkout 2900005ea287b11dcc8c1b9fcf24893b7ff41d6d
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sh SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All error/warnings (new ones prefixed by >>):

   sh4-linux-ld: arch/sh/lib/mcount.o: in function `stack_panic':
>> (.text+0x50): undefined reference to `dump_stack'
--
>> kernel/bpf/syscall.c:4944:13: warning: no previous prototype for 'unpriv_ebpf_notify' [-Wmissing-prototypes]
    4944 | void __weak unpriv_ebpf_notify(int new_state)
         |             ^~~~~~~~~~~~~~~~~~


vim +/unpriv_ebpf_notify +4944 kernel/bpf/syscall.c

  4943	
> 4944	void __weak unpriv_ebpf_notify(int new_state)
  4945	{
  4946	}
  4947	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp