tree: https://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git dsa_page_zero_prototype head: 443bff56d346197a2f8c09c7159ebc9e7440429b commit: 1cbda083dce71e5bcaeae60233ae5ed7eaa519b5 [30/39] mm/pagezero: Add page zero engine register/unregister functions config: arc-allyesconfig (attached as .config) 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://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git/commit/?id... git remote add aegl https://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git git fetch --no-tags aegl dsa_page_zero_prototype git checkout 1cbda083dce71e5bcaeae60233ae5ed7eaa519b5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc 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/page_alloc.c:3785:15: error: no previous prototype for 'should_fail_alloc_page' [-Werror=missing-prototypes] 3785 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | ^~~~~~~~~~~~~~~~~~~~~~ 167 | static int (*engine_cleanup)(int node, void **v); | ^~~~~~~~~~~~~~ 163 | static void *(*alloc_zone_private)(int node); | ^~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/engine_cleanup +167 mm/page_alloc.c 162 164 static int (*get_zero_pages)(void *private, int migratetype, int want, 165 struct list_head *l, int *countp); 166 static void (*provide_page)(void *v, struct page *page); 168 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org