Hi Usama, kernel test robot noticed the following build errors: [auto build test ERROR on akpm-mm/mm-everything] [also build test ERROR on perf-tools-next/perf-tools-next tip/perf/core perf-tools/perf-tools linus/master v6.15-rc6] [cannot apply to acme/perf/core next-20250515] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Usama-Arif/prctl-introduce-PR_THP_POLICY_DEFAULT_HUGE-for-the-process/20250515-213850 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20250515133519.2779639-3-usamaarif642%40gmail.com patch subject: [PATCH 2/6] prctl: introduce PR_THP_POLICY_DEFAULT_NOHUGE for the process config: m68k-allnoconfig (https://download.01.org/0day-ci/archive/20250516/202505161626.4OeUVh4j-lkp@xxxxxxxxx/config) compiler: m68k-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250516/202505161626.4OeUVh4j-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202505161626.4OeUVh4j-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): kernel/sys.c: In function '__do_sys_prctl': kernel/sys.c:2678:25: error: implicit declaration of function 'process_vmas_thp_default_huge' [-Wimplicit-function-declaration] 2678 | process_vmas_thp_default_huge(me->mm); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> kernel/sys.c:2683:25: error: implicit declaration of function 'process_vmas_thp_default_nohuge' [-Wimplicit-function-declaration] 2683 | process_vmas_thp_default_nohuge(me->mm); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/process_vmas_thp_default_nohuge +2683 kernel/sys.c 2472 2473 SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, 2474 unsigned long, arg4, unsigned long, arg5) 2475 { 2476 struct task_struct *me = current; 2477 unsigned char comm[sizeof(me->comm)]; 2478 long error; 2479 2480 error = security_task_prctl(option, arg2, arg3, arg4, arg5); 2481 if (error != -ENOSYS) 2482 return error; 2483 2484 error = 0; 2485 switch (option) { 2486 case PR_SET_PDEATHSIG: 2487 if (!valid_signal(arg2)) { 2488 error = -EINVAL; 2489 break; 2490 } 2491 me->pdeath_signal = arg2; 2492 break; 2493 case PR_GET_PDEATHSIG: 2494 error = put_user(me->pdeath_signal, (int __user *)arg2); 2495 break; 2496 case PR_GET_DUMPABLE: 2497 error = get_dumpable(me->mm); 2498 break; 2499 case PR_SET_DUMPABLE: 2500 if (arg2 != SUID_DUMP_DISABLE && arg2 != SUID_DUMP_USER) { 2501 error = -EINVAL; 2502 break; 2503 } 2504 set_dumpable(me->mm, arg2); 2505 break; 2506 2507 case PR_SET_UNALIGN: 2508 error = SET_UNALIGN_CTL(me, arg2); 2509 break; 2510 case PR_GET_UNALIGN: 2511 error = GET_UNALIGN_CTL(me, arg2); 2512 break; 2513 case PR_SET_FPEMU: 2514 error = SET_FPEMU_CTL(me, arg2); 2515 break; 2516 case PR_GET_FPEMU: 2517 error = GET_FPEMU_CTL(me, arg2); 2518 break; 2519 case PR_SET_FPEXC: 2520 error = SET_FPEXC_CTL(me, arg2); 2521 break; 2522 case PR_GET_FPEXC: 2523 error = GET_FPEXC_CTL(me, arg2); 2524 break; 2525 case PR_GET_TIMING: 2526 error = PR_TIMING_STATISTICAL; 2527 break; 2528 case PR_SET_TIMING: 2529 if (arg2 != PR_TIMING_STATISTICAL) 2530 error = -EINVAL; 2531 break; 2532 case PR_SET_NAME: 2533 comm[sizeof(me->comm) - 1] = 0; 2534 if (strncpy_from_user(comm, (char __user *)arg2, 2535 sizeof(me->comm) - 1) < 0) 2536 return -EFAULT; 2537 set_task_comm(me, comm); 2538 proc_comm_connector(me); 2539 break; 2540 case PR_GET_NAME: 2541 get_task_comm(comm, me); 2542 if (copy_to_user((char __user *)arg2, comm, sizeof(comm))) 2543 return -EFAULT; 2544 break; 2545 case PR_GET_ENDIAN: 2546 error = GET_ENDIAN(me, arg2); 2547 break; 2548 case PR_SET_ENDIAN: 2549 error = SET_ENDIAN(me, arg2); 2550 break; 2551 case PR_GET_SECCOMP: 2552 error = prctl_get_seccomp(); 2553 break; 2554 case PR_SET_SECCOMP: 2555 error = prctl_set_seccomp(arg2, (char __user *)arg3); 2556 break; 2557 case PR_GET_TSC: 2558 error = GET_TSC_CTL(arg2); 2559 break; 2560 case PR_SET_TSC: 2561 error = SET_TSC_CTL(arg2); 2562 break; 2563 case PR_TASK_PERF_EVENTS_DISABLE: 2564 error = perf_event_task_disable(); 2565 break; 2566 case PR_TASK_PERF_EVENTS_ENABLE: 2567 error = perf_event_task_enable(); 2568 break; 2569 case PR_GET_TIMERSLACK: 2570 if (current->timer_slack_ns > ULONG_MAX) 2571 error = ULONG_MAX; 2572 else 2573 error = current->timer_slack_ns; 2574 break; 2575 case PR_SET_TIMERSLACK: 2576 if (rt_or_dl_task_policy(current)) 2577 break; 2578 if (arg2 <= 0) 2579 current->timer_slack_ns = 2580 current->default_timer_slack_ns; 2581 else 2582 current->timer_slack_ns = arg2; 2583 break; 2584 case PR_MCE_KILL: 2585 if (arg4 | arg5) 2586 return -EINVAL; 2587 switch (arg2) { 2588 case PR_MCE_KILL_CLEAR: 2589 if (arg3 != 0) 2590 return -EINVAL; 2591 current->flags &= ~PF_MCE_PROCESS; 2592 break; 2593 case PR_MCE_KILL_SET: 2594 current->flags |= PF_MCE_PROCESS; 2595 if (arg3 == PR_MCE_KILL_EARLY) 2596 current->flags |= PF_MCE_EARLY; 2597 else if (arg3 == PR_MCE_KILL_LATE) 2598 current->flags &= ~PF_MCE_EARLY; 2599 else if (arg3 == PR_MCE_KILL_DEFAULT) 2600 current->flags &= 2601 ~(PF_MCE_EARLY|PF_MCE_PROCESS); 2602 else 2603 return -EINVAL; 2604 break; 2605 default: 2606 return -EINVAL; 2607 } 2608 break; 2609 case PR_MCE_KILL_GET: 2610 if (arg2 | arg3 | arg4 | arg5) 2611 return -EINVAL; 2612 if (current->flags & PF_MCE_PROCESS) 2613 error = (current->flags & PF_MCE_EARLY) ? 2614 PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; 2615 else 2616 error = PR_MCE_KILL_DEFAULT; 2617 break; 2618 case PR_SET_MM: 2619 error = prctl_set_mm(arg2, arg3, arg4, arg5); 2620 break; 2621 case PR_GET_TID_ADDRESS: 2622 error = prctl_get_tid_address(me, (int __user * __user *)arg2); 2623 break; 2624 case PR_SET_CHILD_SUBREAPER: 2625 me->signal->is_child_subreaper = !!arg2; 2626 if (!arg2) 2627 break; 2628 2629 walk_process_tree(me, propagate_has_child_subreaper, NULL); 2630 break; 2631 case PR_GET_CHILD_SUBREAPER: 2632 error = put_user(me->signal->is_child_subreaper, 2633 (int __user *)arg2); 2634 break; 2635 case PR_SET_NO_NEW_PRIVS: 2636 if (arg2 != 1 || arg3 || arg4 || arg5) 2637 return -EINVAL; 2638 2639 task_set_no_new_privs(current); 2640 break; 2641 case PR_GET_NO_NEW_PRIVS: 2642 if (arg2 || arg3 || arg4 || arg5) 2643 return -EINVAL; 2644 return task_no_new_privs(current) ? 1 : 0; 2645 case PR_GET_THP_DISABLE: 2646 if (arg2 || arg3 || arg4 || arg5) 2647 return -EINVAL; 2648 error = !!test_bit(MMF_DISABLE_THP, &me->mm->flags); 2649 break; 2650 case PR_SET_THP_DISABLE: 2651 if (arg3 || arg4 || arg5) 2652 return -EINVAL; 2653 if (mmap_write_lock_killable(me->mm)) 2654 return -EINTR; 2655 if (arg2) 2656 set_bit(MMF_DISABLE_THP, &me->mm->flags); 2657 else 2658 clear_bit(MMF_DISABLE_THP, &me->mm->flags); 2659 mmap_write_unlock(me->mm); 2660 break; 2661 case PR_GET_THP_POLICY: 2662 if (arg2 || arg3 || arg4 || arg5) 2663 return -EINVAL; 2664 if (!!test_bit(MMF2_THP_VMA_DEFAULT_HUGE, &me->mm->flags2)) 2665 error = PR_THP_POLICY_DEFAULT_HUGE; 2666 else if (!!test_bit(MMF2_THP_VMA_DEFAULT_NOHUGE, &me->mm->flags2)) 2667 error = PR_THP_POLICY_DEFAULT_NOHUGE; 2668 break; 2669 case PR_SET_THP_POLICY: 2670 if (arg3 || arg4 || arg5) 2671 return -EINVAL; 2672 if (mmap_write_lock_killable(me->mm)) 2673 return -EINTR; 2674 switch (arg2) { 2675 case PR_THP_POLICY_DEFAULT_HUGE: 2676 set_bit(MMF2_THP_VMA_DEFAULT_HUGE, &me->mm->flags2); 2677 clear_bit(MMF2_THP_VMA_DEFAULT_NOHUGE, &me->mm->flags2); 2678 process_vmas_thp_default_huge(me->mm); 2679 break; 2680 case PR_THP_POLICY_DEFAULT_NOHUGE: 2681 clear_bit(MMF2_THP_VMA_DEFAULT_HUGE, &me->mm->flags2); 2682 set_bit(MMF2_THP_VMA_DEFAULT_NOHUGE, &me->mm->flags2); > 2683 process_vmas_thp_default_nohuge(me->mm); 2684 break; 2685 default: 2686 return -EINVAL; 2687 } 2688 mmap_write_unlock(me->mm); 2689 break; 2690 case PR_MPX_ENABLE_MANAGEMENT: 2691 case PR_MPX_DISABLE_MANAGEMENT: 2692 /* No longer implemented: */ 2693 return -EINVAL; 2694 case PR_SET_FP_MODE: 2695 error = SET_FP_MODE(me, arg2); 2696 break; 2697 case PR_GET_FP_MODE: 2698 error = GET_FP_MODE(me); 2699 break; 2700 case PR_SVE_SET_VL: 2701 error = SVE_SET_VL(arg2); 2702 break; 2703 case PR_SVE_GET_VL: 2704 error = SVE_GET_VL(); 2705 break; 2706 case PR_SME_SET_VL: 2707 error = SME_SET_VL(arg2); 2708 break; 2709 case PR_SME_GET_VL: 2710 error = SME_GET_VL(); 2711 break; 2712 case PR_GET_SPECULATION_CTRL: 2713 if (arg3 || arg4 || arg5) 2714 return -EINVAL; 2715 error = arch_prctl_spec_ctrl_get(me, arg2); 2716 break; 2717 case PR_SET_SPECULATION_CTRL: 2718 if (arg4 || arg5) 2719 return -EINVAL; 2720 error = arch_prctl_spec_ctrl_set(me, arg2, arg3); 2721 break; 2722 case PR_PAC_RESET_KEYS: 2723 if (arg3 || arg4 || arg5) 2724 return -EINVAL; 2725 error = PAC_RESET_KEYS(me, arg2); 2726 break; 2727 case PR_PAC_SET_ENABLED_KEYS: 2728 if (arg4 || arg5) 2729 return -EINVAL; 2730 error = PAC_SET_ENABLED_KEYS(me, arg2, arg3); 2731 break; 2732 case PR_PAC_GET_ENABLED_KEYS: 2733 if (arg2 || arg3 || arg4 || arg5) 2734 return -EINVAL; 2735 error = PAC_GET_ENABLED_KEYS(me); 2736 break; 2737 case PR_SET_TAGGED_ADDR_CTRL: 2738 if (arg3 || arg4 || arg5) 2739 return -EINVAL; 2740 error = SET_TAGGED_ADDR_CTRL(arg2); 2741 break; 2742 case PR_GET_TAGGED_ADDR_CTRL: 2743 if (arg2 || arg3 || arg4 || arg5) 2744 return -EINVAL; 2745 error = GET_TAGGED_ADDR_CTRL(); 2746 break; 2747 case PR_SET_IO_FLUSHER: 2748 if (!capable(CAP_SYS_RESOURCE)) 2749 return -EPERM; 2750 2751 if (arg3 || arg4 || arg5) 2752 return -EINVAL; 2753 2754 if (arg2 == 1) 2755 current->flags |= PR_IO_FLUSHER; 2756 else if (!arg2) 2757 current->flags &= ~PR_IO_FLUSHER; 2758 else 2759 return -EINVAL; 2760 break; 2761 case PR_GET_IO_FLUSHER: 2762 if (!capable(CAP_SYS_RESOURCE)) 2763 return -EPERM; 2764 2765 if (arg2 || arg3 || arg4 || arg5) 2766 return -EINVAL; 2767 2768 error = (current->flags & PR_IO_FLUSHER) == PR_IO_FLUSHER; 2769 break; 2770 case PR_SET_SYSCALL_USER_DISPATCH: 2771 error = set_syscall_user_dispatch(arg2, arg3, arg4, 2772 (char __user *) arg5); 2773 break; 2774 #ifdef CONFIG_SCHED_CORE 2775 case PR_SCHED_CORE: 2776 error = sched_core_share_pid(arg2, arg3, arg4, arg5); 2777 break; 2778 #endif 2779 case PR_SET_MDWE: 2780 error = prctl_set_mdwe(arg2, arg3, arg4, arg5); 2781 break; 2782 case PR_GET_MDWE: 2783 error = prctl_get_mdwe(arg2, arg3, arg4, arg5); 2784 break; 2785 case PR_PPC_GET_DEXCR: 2786 if (arg3 || arg4 || arg5) 2787 return -EINVAL; 2788 error = PPC_GET_DEXCR_ASPECT(me, arg2); 2789 break; 2790 case PR_PPC_SET_DEXCR: 2791 if (arg4 || arg5) 2792 return -EINVAL; 2793 error = PPC_SET_DEXCR_ASPECT(me, arg2, arg3); 2794 break; 2795 case PR_SET_VMA: 2796 error = prctl_set_vma(arg2, arg3, arg4, arg5); 2797 break; 2798 case PR_GET_AUXV: 2799 if (arg4 || arg5) 2800 return -EINVAL; 2801 error = prctl_get_auxv((void __user *)arg2, arg3); 2802 break; 2803 #ifdef CONFIG_KSM 2804 case PR_SET_MEMORY_MERGE: 2805 if (arg3 || arg4 || arg5) 2806 return -EINVAL; 2807 if (mmap_write_lock_killable(me->mm)) 2808 return -EINTR; 2809 2810 if (arg2) 2811 error = ksm_enable_merge_any(me->mm); 2812 else 2813 error = ksm_disable_merge_any(me->mm); 2814 mmap_write_unlock(me->mm); 2815 break; 2816 case PR_GET_MEMORY_MERGE: 2817 if (arg2 || arg3 || arg4 || arg5) 2818 return -EINVAL; 2819 2820 error = !!test_bit(MMF_VM_MERGE_ANY, &me->mm->flags); 2821 break; 2822 #endif 2823 case PR_RISCV_V_SET_CONTROL: 2824 error = RISCV_V_SET_CONTROL(arg2); 2825 break; 2826 case PR_RISCV_V_GET_CONTROL: 2827 error = RISCV_V_GET_CONTROL(); 2828 break; 2829 case PR_RISCV_SET_ICACHE_FLUSH_CTX: 2830 error = RISCV_SET_ICACHE_FLUSH_CTX(arg2, arg3); 2831 break; 2832 case PR_GET_SHADOW_STACK_STATUS: 2833 if (arg3 || arg4 || arg5) 2834 return -EINVAL; 2835 error = arch_get_shadow_stack_status(me, (unsigned long __user *) arg2); 2836 break; 2837 case PR_SET_SHADOW_STACK_STATUS: 2838 if (arg3 || arg4 || arg5) 2839 return -EINVAL; 2840 error = arch_set_shadow_stack_status(me, arg2); 2841 break; 2842 case PR_LOCK_SHADOW_STACK_STATUS: 2843 if (arg3 || arg4 || arg5) 2844 return -EINVAL; 2845 error = arch_lock_shadow_stack_status(me, arg2); 2846 break; 2847 case PR_TIMER_CREATE_RESTORE_IDS: 2848 if (arg3 || arg4 || arg5) 2849 return -EINVAL; 2850 error = posixtimer_create_prctl(arg2); 2851 break; 2852 default: 2853 trace_task_prctl_unknown(option, arg2, arg3, arg4, arg5); 2854 error = -EINVAL; 2855 break; 2856 } 2857 return error; 2858 } 2859 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
