tree: https://github.com/zen-kernel/zen-kernel 5.13/futex2-tkg head: 8eb940ffa39f19c4ddf284615dfb27a6444a3c1d commit: e0c5fabdb1a5efa8d1c606485e22709fd4f90fb5 [3/15] futex2: Implement vectorized wait config: mips-randconfig-r026-20210720 (attached as .config) compiler: mips64-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/e0c5fabdb1a5efa8d1c606485... 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-tkg git checkout e0c5fabdb1a5efa8d1c606485e22709fd4f90fb5 # 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=mips 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:723:16: warning: 'struct compat_futex_waitv' declared inside parameter list will not be visible outside of this definition or declaration 723 | struct compat_futex_waitv __user *uwaitv, | ^~~~~~~~~~~~~~~~~~ kernel/futex2.c: In function 'compat_futex_parse_waitv': 727 | struct compat_futex_waitv waitv; | ^~~~~ kernel/futex2.c:731:37: error: invalid use of undefined type 'struct compat_futex_waitv' 731 | if (copy_from_user(&waitv, &uwaitv[i], sizeof(waitv))) | ^ kernel/futex2.c:740:31: error: implicit declaration of function 'compat_ptr' [-Werror=implicit-function-declaration] 740 | futexv->objects[i].uaddr = compat_ptr(waitv.uaddr); | ^~~~~~~~~~ kernel/futex2.c:727:28: warning: unused variable 'waitv' [-Wunused-variable] 727 | struct compat_futex_waitv waitv; | ^~~~~ kernel/futex2.c: At top level: kernel/futex2.c:759:36: error: expected ')' before 'struct' 759 | COMPAT_SYSCALL_DEFINE4(futex_waitv, struct compat_futex_waitv __user *, waiters, | ^~~~~~~ | ) kernel/futex2.c:722:12: warning: 'compat_futex_parse_waitv' defined but not used [-Wunused-function] 722 | static int compat_futex_parse_waitv(struct futex_waiter_head *futexv, | ^~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +727 kernel/futex2.c 712 713 #ifdef CONFIG_COMPAT 714 /** 715 * compat_futex_parse_waitv - Parse a waitv array from userspace 716 * @futexv: Kernel side list of waiters to be filled 717 * @uwaitv: Userspace list to be parsed 718 * @nr_futexes: Length of futexv 719 * 720 * Return: Error code on failure, pointer to a prepared futexv otherwise 721 */ 722 static int compat_futex_parse_waitv(struct futex_waiter_head *futexv, 724 unsigned int nr_futexes) 725 { 726 struct futex_bucket *bucket; 728 unsigned int i; 729 730 for (i = 0; i < nr_futexes; i++) { 731 if (copy_from_user(&waitv, &uwaitv[i], sizeof(waitv))) 732 return -EFAULT; 733 734 if ((waitv.flags & ~FUTEXV_WAITER_MASK) || 735 (waitv.flags & FUTEX_SIZE_MASK) != FUTEX_32) 736 return -EINVAL; 737 738 futexv->objects[i].key.pointer = 0; 739 futexv->objects[i].flags = waitv.flags; 740 futexv->objects[i].uaddr = compat_ptr(waitv.uaddr); 741 futexv->objects[i].val = waitv.val; 742 futexv->objects[i].index = i; 743 744 bucket = futex_get_bucket(compat_ptr(waitv.uaddr), 745 &futexv->objects[i].key, 746 is_object_shared); 747 748 if (IS_ERR(bucket)) 749 return PTR_ERR(bucket); 750 751 futexv->objects[i].bucket = bucket; 752 753 INIT_LIST_HEAD(&futexv->objects[i].list); 754 } 755 756 return 0; 757 } 758 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org