Hi Colin, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on net/master] url: https://github.com/0day-ci/linux/commits/Colin-Foster/Fix-NULL-pointer-de... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 03c82e80ec283b115c56026ecdb95c901a57c51e config: arc-randconfig-r043-20220122 (https://download.01.org/0day-ci/archive/20220122/202201221122.LOf7DZi6-lk...) compiler: arceb-elf-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/6b2d9e5c2901873c8bba988d4db6cd5bf... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Colin-Foster/Fix-NULL-pointer-dereference-in-page_pool/20220122-085826 git checkout 6b2d9e5c2901873c8bba988d4db6cd5bfbaaeec4 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash net/core/ 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 >>): net/core/page_pool.c: In function 'page_pool_set_pp_info': 216 | if (pool->p && pool->p.init_callback) | ^~~~ vim +216 net/core/page_pool.c 210 211 static void page_pool_set_pp_info(struct page_pool *pool, 212 struct page *page) 213 { 214 page->pp = pool; 215 page->pp_magic |= PP_SIGNATURE; 217 pool->p.init_callback(page, pool->p.init_arg); 218 } 219 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org