linux-kernel - [zx2c4-wireguard:devel 1/2] lib/crypto/poly1305-selftest.c:1043:13: warning: no previous prototype for function 'poly1305

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Date:   Tue, 22 Mar 2022 11:38:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Jason A. Donenfeld" <zx2c4@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org, build@...eguard.com,
        linux-kernel@...r.kernel.org
Subject: [zx2c4-wireguard:devel 1/2] lib/crypto/poly1305-selftest.c:1043:13:
 warning: no previous prototype for function 'poly1305_selftest'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/zx2c4/wireguard-linux.git devel
head:   85edbe4cea2a4446b6425d67a00c04dce142b2f2
commit: 957612a1219877cad2e0fd43f89dea54575db069 [1/2] crypto: poly1305 - add library selftests
config: s390-randconfig-r044-20220320 (https://download.01.org/0day-ci/archive/20220322/202203221101.Vd8pIU2T-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 85e9b2687a13d1908aa86d1b89c5ce398a06cd39)
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
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/zx2c4/wireguard-linux.git/commit/?id=957612a1219877cad2e0fd43f89dea54575db069
        git remote add zx2c4-wireguard https://git.kernel.org/pub/scm/linux/kernel/git/zx2c4/wireguard-linux.git
        git fetch --no-tags zx2c4-wireguard devel
        git checkout 957612a1219877cad2e0fd43f89dea54575db069
        # 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=s390 SHELL=/bin/bash lib/crypto/

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 >>):

>> lib/crypto/poly1305-selftest.c:1043:13: warning: no previous prototype for function 'poly1305_selftest' [-Wmissing-prototypes]
   bool __init poly1305_selftest(void)
               ^
   lib/crypto/poly1305-selftest.c:1043:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool __init poly1305_selftest(void)
   ^
   static 
   1 warning generated.


vim +/poly1305_selftest +1043 lib/crypto/poly1305-selftest.c

  1042	
> 1043	bool __init poly1305_selftest(void)
  1044	{
  1045		bool success = true;
  1046		size_t i, j;
  1047	
  1048		for (i = 0; i < ARRAY_SIZE(poly1305_testvecs); ++i) {
  1049			struct poly1305_desc_ctx poly1305;
  1050			u8 out[POLY1305_DIGEST_SIZE];
  1051	
  1052			memset(out, 0, sizeof(out));
  1053			memset(&poly1305, 0, sizeof(poly1305));
  1054			poly1305_init(&poly1305, poly1305_testvecs[i].key);
  1055			poly1305_update(&poly1305, poly1305_testvecs[i].input,
  1056					poly1305_testvecs[i].ilen);
  1057			poly1305_final(&poly1305, out);
  1058			if (memcmp(out, poly1305_testvecs[i].output,
  1059				   POLY1305_DIGEST_SIZE)) {
  1060				pr_err("poly1305 self-test %zu: FAIL\n", i + 1);
  1061				success = false;
  1062			}
  1063	
  1064			if (poly1305_testvecs[i].ilen <= 1)
  1065				continue;
  1066	
  1067			for (j = 1; j < poly1305_testvecs[i].ilen - 1; ++j) {
  1068				memset(out, 0, sizeof(out));
  1069				memset(&poly1305, 0, sizeof(poly1305));
  1070				poly1305_init(&poly1305, poly1305_testvecs[i].key);
  1071				poly1305_update(&poly1305, poly1305_testvecs[i].input, j);
  1072				poly1305_update(&poly1305,
  1073						poly1305_testvecs[i].input + j,
  1074						poly1305_testvecs[i].ilen - j);
  1075				poly1305_final(&poly1305, out);
  1076				if (memcmp(out, poly1305_testvecs[i].output,
  1077					   POLY1305_DIGEST_SIZE)) {
  1078					pr_err("poly1305 self-test %zu (split %zu): FAIL\n",
  1079					       i + 1, j);
  1080					success = false;
  1081				}
  1082	

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