Hi Minchan, I love your patch! Yet something to improve: [auto build test ERROR on v5.15] [cannot apply to hnaz-mm/master next-20211111] [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/Minchan-Kim/zsmalloc-remove-bit_... base: DEBUG invalid remote for branch v5.15 8bb7eca972ad531c9b149c0a51ab43a417385813 config: xtensa-buildonly-randconfig-r004-20211111 (attached as .config) compiler: xtensa-linux-gcc (GCC) 11.2.0 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/f1a88e64864de6af4e2a560bcf57a8b5f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Minchan-Kim/zsmalloc-remove-bit_spin_lock/20211111-025648 git checkout f1a88e64864de6af4e2a560bcf57a8b5f9737404 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=xtensa 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 >>): mm/zsmalloc.c: In function 'migrate_write_lock_nested': 1772 | write_lock_nested(&zspage->lock, SINGLE_DEPTH_NESTING); | ^~~~~~~~~~~~~~~~~ | inode_lock_nested cc1: some warnings being treated as errors vim +1772 mm/zsmalloc.c 1769 1770 static void migrate_write_lock_nested(struct zspage *zspage) 1771 { 1773 } 1774 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org