Hi Stephen, I love your patch! Perhaps something to improve: [auto build test WARNING on d07f6ca923ea0927a1024dfccafc5b53b61cfecc] url: https://github.com/0day-ci/linux/commits/Stephen-Boyd/slub-Print-non-hashed-pointers-in-slub-debugging/20210526-105816 base: d07f6ca923ea0927a1024dfccafc5b53b61cfecc config: powerpc-randconfig-r013-20210526 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 99155e913e9bad5f7f8a247f8bb3a3ff3da74af1) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://github.com/0day-ci/linux/commit/1e3e0117436276faacd0217d89715df61021b4d2 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Stephen-Boyd/slub-Print-non-hashed-pointers-in-slub-debugging/20210526-105816 git checkout 1e3e0117436276faacd0217d89715df61021b4d2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> lib/vsprintf.c:2189:12: warning: no previous prototype for function 'no_hash_pointers_enable' [-Wmissing-prototypes] int __init no_hash_pointers_enable(char *str) ^ lib/vsprintf.c:2189:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __init no_hash_pointers_enable(char *str) ^ static 1 warning generated. vim +/no_hash_pointers_enable +2189 lib/vsprintf.c 2188 > 2189 int __init no_hash_pointers_enable(char *str) 2190 { 2191 if (no_hash_pointers) 2192 return 0; 2193 2194 no_hash_pointers = true; 2195 2196 pr_warn("**********************************************************\n"); 2197 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); 2198 pr_warn("** **\n"); 2199 pr_warn("** This system shows unhashed kernel memory addresses **\n"); 2200 pr_warn("** via the console, logs, and other interfaces. This **\n"); 2201 pr_warn("** might reduce the security of your system. **\n"); 2202 pr_warn("** **\n"); 2203 pr_warn("** If you see this message and you are not debugging **\n"); 2204 pr_warn("** the kernel, report this immediately to your system **\n"); 2205 pr_warn("** administrator! **\n"); 2206 pr_warn("** **\n"); 2207 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); 2208 pr_warn("**********************************************************\n"); 2209 2210 return 0; 2211 } 2212 early_param("no_hash_pointers", no_hash_pointers_enable); 2213 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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