linux-kernel - tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:14:1: warning: no previous prototype for function 'bpf_testmod_test

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Message-ID: <202108061743.bzu47Nwu-lkp@intel.com>
Date:   Fri, 6 Aug 2021 17:34:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:14:1: warning:
 no previous prototype for function 'bpf_testmod_test_read'

Hi Arnaldo,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   902e7f373fff2476b53824264c12e4e76c7ec02a
commit: 4bba4c4bb09ad4a2b70836725e08439c86d8f9e4 tools headers: Get tools's linux/compiler.h closer to the kernel's
date:   8 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=4bba4c4bb09ad4a2b70836725e08439c86d8f9e4
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4bba4c4bb09ad4a2b70836725e08439c86d8f9e4
        # 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@...el.com>

All warnings (new ones prefixed by >>):

>> tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:14:1: 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:13:10: note: declare 'static' if the function is not intended to be used outside of this translation unit
   noinline ssize_t
            ^
            static 
   1 warning generated.


vim +/bpf_testmod_test_read +14 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c

9f7fa225894c7f Andrii Nakryiko 2020-12-03  12  
9f7fa225894c7f Andrii Nakryiko 2020-12-03  13  noinline ssize_t
9f7fa225894c7f Andrii Nakryiko 2020-12-03 @14  bpf_testmod_test_read(struct file *file, struct kobject *kobj,
9f7fa225894c7f Andrii Nakryiko 2020-12-03  15  		      struct bin_attribute *bin_attr,
9f7fa225894c7f Andrii Nakryiko 2020-12-03  16  		      char *buf, loff_t off, size_t len)
9f7fa225894c7f Andrii Nakryiko 2020-12-03  17  {
9f7fa225894c7f Andrii Nakryiko 2020-12-03  18  	struct bpf_testmod_test_read_ctx ctx = {
9f7fa225894c7f Andrii Nakryiko 2020-12-03  19  		.buf = buf,
9f7fa225894c7f Andrii Nakryiko 2020-12-03  20  		.off = off,
9f7fa225894c7f Andrii Nakryiko 2020-12-03  21  		.len = len,
9f7fa225894c7f Andrii Nakryiko 2020-12-03  22  	};
9f7fa225894c7f Andrii Nakryiko 2020-12-03  23  
9f7fa225894c7f Andrii Nakryiko 2020-12-03  24  	trace_bpf_testmod_test_read(current, &ctx);
9f7fa225894c7f Andrii Nakryiko 2020-12-03  25  
9f7fa225894c7f Andrii Nakryiko 2020-12-03  26  	return -EIO; /* always fail */
9f7fa225894c7f Andrii Nakryiko 2020-12-03  27  }
9f7fa225894c7f Andrii Nakryiko 2020-12-03  28  EXPORT_SYMBOL(bpf_testmod_test_read);
9f7fa225894c7f Andrii Nakryiko 2020-12-03  29  ALLOW_ERROR_INJECTION(bpf_testmod_test_read, ERRNO);
9f7fa225894c7f Andrii Nakryiko 2020-12-03  30  

:::::: The code at line 14 was first introduced by commit
:::::: 9f7fa225894c7fcb014f3699a402fcc4d896cb1c selftests/bpf: Add bpf_testmod kernel module for testing

:::::: TO: Andrii Nakryiko <andrii@...nel.org>
:::::: 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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