In-Reply-To: <20211112150824.11028-9-joao.m.martins(a)oracle.com&gt; References: <20211112150824.11028-9-joao.m.martins(a)oracle.com&gt; TO: Joao Martins <joao.m.martins(a)oracle.com&gt; TO: linux-mm(a)kvack.org CC: Dan Williams <dan.j.williams(a)intel.com&gt; CC: Vishal Verma <vishal.l.verma(a)intel.com&gt; CC: Dave Jiang <dave.jiang(a)intel.com&gt; CC: Naoya Horiguchi <naoya.horiguchi(a)nec.com&gt; CC: Matthew Wilcox <willy(a)infradead.org&gt; CC: Jason Gunthorpe <jgg(a)ziepe.ca&gt; CC: John Hubbard <jhubbard(a)nvidia.com&gt; CC: Jane Chu <jane.chu(a)oracle.com&gt; CC: Muchun Song <songmuchun(a)bytedance.com&gt; Hi Joao, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on hnaz-mm/master] url: https://github.com/0day-ci/linux/commits/Joao-Martins/mm-dax-Introduce-co... base: https://github.com/hnaz/linux-mm master config: x86_64-randconfig-a013-20211115 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a) 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://github.com/0day-ci/linux/commit/c9e6e4bec537287b0e2cf8544276f77d0... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Joao-Martins/mm-dax-Introduce-compound-pages-in-devmap/20211112-231110 git checkout c9e6e4bec537287b0e2cf8544276f77d02f1d00c # save the attached .config 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 drivers/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/dax/device.c:419:5: warning: no previous prototype for function 'dev_dax_probe' [-Wmissing-prototypes] int dev_dax_probe(struct dev_dax *dev_dax) ^ drivers/dax/device.c:419:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int dev_dax_probe(struct dev_dax *dev_dax) ^ static 1 warning generated. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org