tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:35:1: warning: no previous prototype for function 'bpf_testmod_test_write'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   894d6f401b21865962aba776ecaa918b2f0abaa6
commit: 407be92206d54517765e028c8b79032eb8f8ac86 selftests: bpf: Add a new test for bare tracepoints
date:   7 months ago
config: x86_64-randconfig-r016-20210805 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 31a71a393f65d9e07b5b0756fef9dd16690950ee)
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/torvalds/linux.git/commit/?id=407be92206d54517765e028c8b79032eb8f8ac86
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 407be92206d54517765e028c8b79032eb8f8ac86
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:17:1: warning: no previous prototype for function 'bpf_testmod_test_read' [-Wmissing-prototypes]
   bpf_testmod_test_read(struct file *file, struct kobject *kobj,
   ^
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:16:10: note: declare 'static' if the function is not intended to be used outside of this translation unit
   noinline ssize_t
            ^
            static 
>> tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:35:1: warning: no previous prototype for function 'bpf_testmod_test_write' [-Wmissing-prototypes]
   bpf_testmod_test_write(struct file *file, struct kobject *kobj,
   ^
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:34:10: note: declare 'static' if the function is not intended to be used outside of this translation unit
   noinline ssize_t
            ^
            static 
   2 warnings generated.


vim +/bpf_testmod_test_write +35 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c

    33	
    34	noinline ssize_t
  > 35	bpf_testmod_test_write(struct file *file, struct kobject *kobj,
    36			      struct bin_attribute *bin_attr,
    37			      char *buf, loff_t off, size_t len)
    38	{
    39		struct bpf_testmod_test_write_ctx ctx = {
    40			.buf = buf,
    41			.off = off,
    42			.len = len,
    43		};
    44	
    45		trace_bpf_testmod_test_write_bare(current, &ctx);
    46	
    47		return -EIO; /* always fail */
    48	}
    49	EXPORT_SYMBOL(bpf_testmod_test_write);
    50	ALLOW_ERROR_INJECTION(bpf_testmod_test_write, ERRNO);
    51	

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

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