linux-kernel - arch/x86/net/bpf_jit_comp.c:2188:5: warning: no previous prototype for 'arch_prepare_bpf

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Message-ID: <202111161117.ZvVGmBJV-lkp@intel.com>
Date:   Tue, 16 Nov 2021 11:25:25 +0800
From:   kernel test robot <lkp@...el.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>
Subject: arch/x86/net/bpf_jit_comp.c:2188:5: warning: no previous prototype
 for 'arch_prepare_bpf_dispatcher'

Hi Daniel,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8ab774587903771821b59471cc723bba6d893942
commit: b24abcff918a5cbf44b0c982bd3477a93e8e4911 bpf, kconfig: Add consolidated menu entry for bpf with core options
date:   6 months ago
config: x86_64-buildonly-randconfig-r006-20211012 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b24abcff918a5cbf44b0c982bd3477a93e8e4911
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b24abcff918a5cbf44b0c982bd3477a93e8e4911
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> arch/x86/net/bpf_jit_comp.c:2188:5: warning: no previous prototype for 'arch_prepare_bpf_dispatcher' [-Wmissing-prototypes]
    2188 | int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/arch_prepare_bpf_dispatcher +2188 arch/x86/net/bpf_jit_comp.c

75ccbef6369e94 Björn Töpel 2019-12-13  2187  
75ccbef6369e94 Björn Töpel 2019-12-13 @2188  int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs)
75ccbef6369e94 Björn Töpel 2019-12-13  2189  {
75ccbef6369e94 Björn Töpel 2019-12-13  2190  	u8 *prog = image;
75ccbef6369e94 Björn Töpel 2019-12-13  2191  
75ccbef6369e94 Björn Töpel 2019-12-13  2192  	sort(funcs, num_funcs, sizeof(funcs[0]), cmp_ips, NULL);
75ccbef6369e94 Björn Töpel 2019-12-13  2193  	return emit_bpf_dispatcher(&prog, 0, num_funcs - 1, funcs);
75ccbef6369e94 Björn Töpel 2019-12-13  2194  }
75ccbef6369e94 Björn Töpel 2019-12-13  2195  

:::::: The code at line 2188 was first introduced by commit
:::::: 75ccbef6369e94ecac696a152a998a978d41376b bpf: Introduce BPF dispatcher

:::::: TO: Björn Töpel <bjorn.topel@...el.com>
:::::: CC: Alexei Starovoitov <ast@...nel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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