tree: https://github.com/zen-kernel/zen-kernel 5.12/futex2 head: a9442359954c51f77fa365e8d15b7950c6aeb55b commit: 04a97ad2406166e12a13f09c9981f18e6487f530 [3/15] futex2: Implement vectorized wait config: powerpc-allyesconfig (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/04a97ad2406166e12a13f09c9... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.12/futex2 git checkout 04a97ad2406166e12a13f09c9981f18e6487f530 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 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:711:16: warning: 'struct compat_futex_waitv' declared inside parameter list will not be visible outside of this definition or declaration 711 | struct compat_futex_waitv __user *uwaitv, | ^~~~~~~~~~~~~~~~~~ kernel/futex2.c: In function 'compat_futex_parse_waitv': 714 | struct compat_futex_waitv waitv; | ^~~~~ 719 | if (copy_from_user(&waitv, &uwaitv[i], sizeof(waitv))) | ^ 728 | futexv->objects[i].uaddr = compat_ptr(waitv.uaddr); | ^~~~~~~~~~ kernel/futex2.c:714:28: warning: unused variable 'waitv' [-Wunused-variable] 714 | struct compat_futex_waitv waitv; | ^~~~~ kernel/futex2.c: At top level: 747 | COMPAT_SYSCALL_DEFINE4(futex_waitv, struct compat_futex_waitv __user *, waiters, | ^~~~~~~ | ) kernel/futex2.c:710:12: warning: 'compat_futex_parse_waitv' defined but not used [-Wunused-function] 710 | static int compat_futex_parse_waitv(struct futex_waiter_head *futexv, | ^~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +714 kernel/futex2.c 700 701 #ifdef CONFIG_COMPAT 702 /** 703 * compat_futex_parse_waitv - Parse a waitv array from userspace 704 * @futexv: Kernel side list of waiters to be filled 705 * @uwaitv: Userspace list to be parsed 706 * @nr_futexes: Length of futexv 707 * 708 * Return: Error code on failure, pointer to a prepared futexv otherwise 709 */ 710 static int compat_futex_parse_waitv(struct futex_waiter_head *futexv, 711 struct compat_futex_waitv __user *uwaitv, 712 unsigned int nr_futexes) 713 { 715 struct futex_bucket *bucket; 716 unsigned int i; 717 718 for (i = 0; i < nr_futexes; i++) { 720 return -EFAULT; 721 722 if ((waitv.flags & ~FUTEXV_WAITER_MASK) || 723 (waitv.flags & FUTEX_SIZE_MASK) != FUTEX_32) 724 return -EINVAL; 725 726 futexv->objects[i].key.pointer = 0; 727 futexv->objects[i].flags = waitv.flags; 729 futexv->objects[i].val = waitv.val; 730 futexv->objects[i].index = i; 731 732 bucket = futex_get_bucket(compat_ptr(waitv.uaddr), 733 &futexv->objects[i].key, 734 is_object_shared); 735 736 if (IS_ERR(bucket)) 737 return PTR_ERR(bucket); 738 739 futexv->objects[i].bucket = bucket; 740 741 INIT_LIST_HEAD(&futexv->objects[i].list); 742 } 743 744 return 0; 745 } 746 748 unsigned int, nr_futexes, unsigned int, flags, 749 struct __kernel_timespec __user *, timo) 750 { 751 struct futex_waiter_head *futexv; 752 int ret; 753 754 if (flags & ~FUTEXV_MASK) 755 return -EINVAL; 756 757 if (!nr_futexes || nr_futexes > FUTEX_WAITV_MAX || !waiters) 758 return -EINVAL; 759 760 futexv = kmalloc((sizeof(struct futex_waiter) * nr_futexes) + 761 sizeof(*futexv), GFP_KERNEL); 762 if (!futexv) 763 return -ENOMEM; 764 765 futexv->hint = false; 766 futexv->task = current; 767 768 ret = compat_futex_parse_waitv(futexv, waiters, nr_futexes); 769 770 if (!ret) 771 ret = __futex_waitv(futexv, nr_futexes, timo, flags); 772 773 kfree(futexv); 774 775 return ret; 776 } 777 #endif 778 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org