tree: https://github.com/zen-kernel/zen-kernel 5.13/futex2 head: db649ce1f5de12432be5bfedd8388eacc2f85efc commit: ef20e009a86beacc6e27a543e1ed358a01b98af7 [16/19] futex2: Add sysfs entry for syscall numbers config: m68k-randconfig-c003-20210718 (attached as .config) compiler: m68k-linux-gcc (GCC) 10.3.0 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/zen-kernel/zen-kernel/commit/ef20e009a86beacc6e27a543e... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.13/futex2 git checkout ef20e009a86beacc6e27a543e1ed358a01b98af7 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=m68k SHELL=/bin/bash 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 >>): kernel/futex2.c: In function 'futex_get_shared_key': kernel/futex2.c:313:31: error: implicit declaration of function 'basepage_index'; did you mean 'page_index'? [-Werror=implicit-function-declaration] 313 | key->index = (unsigned long)basepage_index(tail); | ^~~~~~~~~~~~~~ | page_index kernel/futex2.c: In function 'wait_show': 1264 | return sprintf(buf, "%u\n", __NR_futex_wait); | ^~~~~~~~~~~~~~~ | ksys_futex_wait kernel/futex2.c:1264:30: note: each undeclared identifier is reported only once for each function it appears in kernel/futex2.c: In function 'wake_show': 1272 | return sprintf(buf, "%u\n", __NR_futex_wake); | ^~~~~~~~~~~~~~~ | ksys_futex_wake kernel/futex2.c: In function 'waitv_show': 1280 | return sprintf(buf, "%u\n", __NR_futex_waitv); | ^~~~~~~~~~~~~~~~ | __futex_waitv kernel/futex2.c:1282:1: error: control reaches end of non-void function [-Werror=return-type] 1282 | } | ^ kernel/futex2.c: In function 'wake_show': kernel/futex2.c:1274:1: error: control reaches end of non-void function [-Werror=return-type] 1274 | } | ^ kernel/futex2.c: In function 'wait_show': kernel/futex2.c:1266:1: error: control reaches end of non-void function [-Werror=return-type] 1266 | } | ^ cc1: some warnings being treated as errors vim +1264 kernel/futex2.c 1260 1261 static ssize_t wait_show(struct kobject *kobj, struct kobj_attribute *attr, 1262 char *buf) 1263 { 1265 1266 } 1267 static struct kobj_attribute futex2_wait_attr = __ATTR_RO(wait); 1268 1269 static ssize_t wake_show(struct kobject *kobj, struct kobj_attribute *attr, 1270 char *buf) 1271 { 1273 1274 } 1275 static struct kobj_attribute futex2_wake_attr = __ATTR_RO(wake); 1276 1277 static ssize_t waitv_show(struct kobject *kobj, struct kobj_attribute *attr, 1278 char *buf) 1279 { 1281 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org