Hi David, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on kdave/for-next] [also build test ERROR on ext4/dev fuse/for-next xfs-linux/for-next tip/perf/core linux/master linus/master v5.12-rc6 next-20210408] [cannot apply to hnaz-linux-mm/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/David-Howells/mm-Split-page_has_... base: https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next config: s390-debug_defconfig (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 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/a00a255f7bf637156368e8545b2c64e39... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review David-Howells/mm-Split-page_has_private-in-two-to-better-handle-PG_private_2/20210409-051632 git checkout a00a255f7bf637156368e8545b2c64e39c93718b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/s390/kernel/uv.c: In function 'expected_page_refs': 178 | if (page_has_private(page)) | ^~~~~~~~~~~~~~~~ | page_private cc1: some warnings being treated as errors vim +178 arch/s390/kernel/uv.c 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 162 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 163 /* 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 164 * Calculate the expected ref_count for a page that would otherwise have no 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 165 * further pins. This was cribbed from similar functions in other places in 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 166 * the kernel, but with some slight modifications. We know that a secure 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 167 * page can not be a huge page for example. 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 168 */ 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 169 static int expected_page_refs(struct page *page) 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 170 { 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 171 int res; 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 172 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 173 res = page_mapcount(page); 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 174 if (PageSwapCache(page)) { 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 175 res++; 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 176 } else if (page_mapping(page)) { 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 177 res++; 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 @178 if (page_has_private(page)) 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 179 res++; 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 180 } 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 181 return res; 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 182 } 214d9bbcd3a672 Claudio Imbrenda 2020-01-21 183 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org