linux-kernel - [mingo-tip:master 413/2335] kernel/bpf/core.c:62:6: warning: no previous prototype for function 'bpf_jit

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Message-ID: <202203172148.CqeOGiiE-lkp@intel.com>
Date:   Thu, 17 Mar 2022 21:59:28 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [mingo-tip:master 413/2335] kernel/bpf/core.c:62:6: warning: no
 previous prototype for function 'bpf_jit_dump'

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git master
head:   85293bf3fca6d85608cff1447ce3097583f15fab
commit: 13afaa4b6ebba9ee9365fa7688a8d7f3fff97749 [413/2335] headers/uninline: Uninline multi-use function: bpf_jit_dump()
config: x86_64-randconfig-a001 (https://download.01.org/0day-ci/archive/20220317/202203172148.CqeOGiiE-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project a6ec1e3d798f8eab43fb3a91028c6ab04e115fcb)
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://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=13afaa4b6ebba9ee9365fa7688a8d7f3fff97749
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip master
        git checkout 13afaa4b6ebba9ee9365fa7688a8d7f3fff97749
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/entry/vdso/ arch/x86/entry/vsyscall/ arch/x86/kernel/cpu/mtrr/ arch/x86/pci/ kernel/bpf/ kernel/trace/ lib/ net/ipv6/

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 >>):

>> kernel/bpf/core.c:62:6: warning: no previous prototype for function 'bpf_jit_dump' [-Wmissing-prototypes]
   void bpf_jit_dump(unsigned int flen, unsigned int proglen, u32 pass, void *image)
        ^
   kernel/bpf/core.c:62:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void bpf_jit_dump(unsigned int flen, unsigned int proglen, u32 pass, void *image)
   ^
   static 
   kernel/bpf/core.c:1378:12: warning: no previous prototype for function 'bpf_probe_read_kernel' [-Wmissing-prototypes]
   u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
              ^
   kernel/bpf/core.c:1378:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
   ^
   static 
   2 warnings generated.


vim +/bpf_jit_dump +62 kernel/bpf/core.c

    61	
  > 62	void bpf_jit_dump(unsigned int flen, unsigned int proglen, u32 pass, void *image)
    63	{
    64		pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
    65		       proglen, pass, image, current->comm, task_pid_nr(current));
    66	
    67		if (image)
    68			print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
    69				       16, 1, image, proglen, false);
    70	}
    71	

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