tree: https://github.com/zen-kernel/zen-kernel 5.13/futex2 head: 67f7da92d1cb45a815c7046f8719942a728216d0 commit: 16c6deba3504c19acf820b765762adf60a53d9d2 [4/5] futex2: Add sysfs entry for syscall numbers config: powerpc64-buildonly-randconfig-r003-20210709 (attached as .config) compiler: powerpc64-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/zen-kernel/zen-kernel/commit/16c6deba3504c19acf820b765... 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 16c6deba3504c19acf820b765762adf60a53d9d2 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=powerpc 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:220:16: warning: 'struct compat_futex_waitv' declared inside parameter list will not be visible outside of this definition or declaration 220 | struct compat_futex_waitv __user *uwaitv, | ^~~~~~~~~~~~~~~~~~ kernel/futex2.c: In function 'compat_futex_parse_waitv': kernel/futex2.c:223:28: error: storage size of 'aux' isn't known 223 | struct compat_futex_waitv aux; | ^~~ kernel/futex2.c:227:35: error: invalid use of undefined type 'struct compat_futex_waitv' 227 | if (copy_from_user(&aux, &uwaitv[i], sizeof(aux))) | ^ kernel/futex2.c:227:35: error: dereferencing pointer to incomplete type 'struct compat_futex_waitv' kernel/futex2.c:236:23: error: implicit declaration of function 'compat_ptr' [-Werror=implicit-function-declaration] 236 | futexv[i].w.uaddr = compat_ptr(aux.uaddr); | ^~~~~~~~~~ kernel/futex2.c:223:28: warning: unused variable 'aux' [-Wunused-variable] 223 | struct compat_futex_waitv aux; | ^~~ kernel/futex2.c: At top level: kernel/futex2.c:243:36: error: expected ')' before 'struct' 243 | COMPAT_SYSCALL_DEFINE4(futex_waitv, struct compat_futex_waitv __user *, waiters, | ^~~~~~~ | ) kernel/futex2.c:406:42: error: expected ')' before 'void' 406 | COMPAT_SYSCALL_DEFINE4(compat_futex_wait, void __user *, uaddr, compat_u64, val, | ^~~~~ | ) kernel/futex2.c: In function 'wait_show': 434 | return sprintf(buf, "%u\n", __NR_futex_wait); | ^~~~~~~~~~~~~~~ | ksys_futex_wait kernel/futex2.c:434:30: note: each undeclared identifier is reported only once for each function it appears in kernel/futex2.c: In function 'wake_show': 442 | return sprintf(buf, "%u\n", __NR_futex_wake); | ^~~~~~~~~~~~~~~ | sys_futex_wake kernel/futex2.c: In function 'waitv_show': kernel/futex2.c:450:30: error: '__NR_futex_waitv' undeclared (first use in this function); did you mean 'sys_futex_waitv'? 450 | return sprintf(buf, "%u\n", __NR_futex_waitv); | ^~~~~~~~~~~~~~~~ | sys_futex_waitv kernel/futex2.c:452:1: error: control reaches end of non-void function [-Werror=return-type] 452 | } | ^ kernel/futex2.c: In function 'wake_show': kernel/futex2.c:444:1: error: control reaches end of non-void function [-Werror=return-type] 444 | } | ^ kernel/futex2.c: In function 'wait_show': kernel/futex2.c:436:1: error: control reaches end of non-void function [-Werror=return-type] 436 | } | ^ At top level: kernel/futex2.c:219:12: warning: 'compat_futex_parse_waitv' defined but not used [-Wunused-function] 219 | static int compat_futex_parse_waitv(struct futex_vector *futexv, | ^~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +434 kernel/futex2.c 430 431 static ssize_t wait_show(struct kobject *kobj, struct kobj_attribute *attr, 432 char *buf) 433 { 435 436 } 437 static struct kobj_attribute futex2_wait_attr = __ATTR_RO(wait); 438 439 static ssize_t wake_show(struct kobject *kobj, struct kobj_attribute *attr, 440 char *buf) 441 { 443 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org