[kbuild-all] [vgupta-arc:topic-zol-remove 79/188] mm/memory.c:3717:21: warning: no previous prototype for function 'do_anonymous_page'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git topic-zol-remove head: 5d273f5d5109b942d3be84a4db0ffe05feb901d4 commit: 94f784d9992cf0c171122f44767c549fa4f353cb [79/188] xxx: disable address space randomization, fault around config: hexagon-randconfig-r041-20211015 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project a49f5386ce6b091da66ea7c3a1d9a588d53becf7) 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://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git/commit/?id... git remote add vgupta-arc https://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git git fetch --no-tags vgupta-arc topic-zol-remove git checkout 94f784d9992cf0c171122f44767c549fa4f353cb # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): noinline vm_fault_t do_anonymous_page(struct vm_fault *vmf) ^ mm/memory.c:3717:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline vm_fault_t do_anonymous_page(struct vm_fault *vmf) ^ static noinline vm_fault_t __do_fault(struct vm_fault *vmf) ^ mm/memory.c:3833:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline vm_fault_t __do_fault(struct vm_fault *vmf) ^ static noinline vm_fault_t do_read_fault(struct vm_fault *vmf) ^ mm/memory.c:4157:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline vm_fault_t do_read_fault(struct vm_fault *vmf) ^ static noinline vm_fault_t do_cow_fault(struct vm_fault *vmf) ^ mm/memory.c:4186:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline vm_fault_t do_cow_fault(struct vm_fault *vmf) ^ static noinline vm_fault_t do_shared_fault(struct vm_fault *vmf) ^ mm/memory.c:4224:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline vm_fault_t do_shared_fault(struct vm_fault *vmf) ^ static noinline vm_fault_t do_fault(struct vm_fault *vmf) ^ mm/memory.c:4267:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline vm_fault_t do_fault(struct vm_fault *vmf) ^ static noinline vm_fault_t handle_pte_fault(struct vm_fault *vmf) ^ mm/memory.c:4506:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline vm_fault_t handle_pte_fault(struct vm_fault *vmf) ^ static noinline vm_fault_t __handle_mm_fault(struct vm_area_struct *vma, ^ mm/memory.c:4610:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline vm_fault_t __handle_mm_fault(struct vm_area_struct *vma, ^ static 8 warnings generated. vim +/do_anonymous_page +3717 mm/memory.c 3711 3712 /* 3713 * We enter with non-exclusive mmap_lock (to exclude vma changes, 3714 * but allow concurrent faults), and pte mapped but not yet locked. 3715 * We return with mmap_lock still held, but pte unmapped and unlocked. 3716 */ 3718 { 3719 struct vm_area_struct *vma = vmf->vma; 3720 struct page *page; 3721 vm_fault_t ret = 0; 3722 pte_t entry; 3723 3724 /* File mapping without ->vm_ops ? */ 3725 if (vma->vm_flags & VM_SHARED) 3726 return VM_FAULT_SIGBUS; 3727 3728 /* 3729 * Use pte_alloc() instead of pte_alloc_map(). We can't run 3730 * pte_offset_map() on pmds where a huge pmd might be created 3731 * from a different thread. 3732 * 3733 * pte_alloc_map() is safe to use under mmap_write_lock(mm) or when 3734 * parallel threads are excluded by other means. 3735 * 3736 * Here we only have mmap_read_lock(mm). 3737 */ 3738 if (pte_alloc(vma->vm_mm, vmf->pmd)) 3739 return VM_FAULT_OOM; 3740 3741 /* See comment in handle_pte_fault() */ 3742 if (unlikely(pmd_trans_unstable(vmf->pmd))) 3743 return 0; 3744 3745 /* Use the zero-page for reads */ 3746 if (!(vmf->flags & FAULT_FLAG_WRITE) && 3747 !mm_forbids_zeropage(vma->vm_mm)) { 3748 entry = pte_mkspecial(pfn_pte(my_zero_pfn(vmf->address), 3749 vma->vm_page_prot)); 3750 vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, 3751 vmf->address, &vmf->ptl); 3752 if (!pte_none(*vmf->pte)) { 3753 update_mmu_tlb(vma, vmf->address, vmf->pte); 3754 goto unlock; 3755 } 3756 ret = check_stable_address_space(vma->vm_mm); 3757 if (ret) 3758 goto unlock; 3759 /* Deliver the page fault to userland, check inside PT lock */ 3760 if (userfaultfd_missing(vma)) { 3761 pte_unmap_unlock(vmf->pte, vmf->ptl); 3762 return handle_userfault(vmf, VM_UFFD_MISSING); 3763 } 3764 goto setpte; 3765 } 3766 3767 /* Allocate our own private page. */ 3768 if (unlikely(anon_vma_prepare(vma))) 3769 goto oom; 3770 page = alloc_zeroed_user_highpage_movable(vma, vmf->address); 3771 if (!page) 3772 goto oom; 3773 3774 if (mem_cgroup_charge(page, vma->vm_mm, GFP_KERNEL)) 3775 goto oom_free_page; 3776 cgroup_throttle_swaprate(page, GFP_KERNEL); 3777 3778 /* 3779 * The memory barrier inside __SetPageUptodate makes sure that 3780 * preceding stores to the page contents become visible before 3781 * the set_pte_at() write. 3782 */ 3783 __SetPageUptodate(page); 3784 3785 entry = mk_pte(page, vma->vm_page_prot); 3786 entry = pte_sw_mkyoung(entry); 3787 if (vma->vm_flags & VM_WRITE) 3788 entry = pte_mkwrite(pte_mkdirty(entry)); 3789 3790 vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, vmf->address, 3791 &vmf->ptl); 3792 if (!pte_none(*vmf->pte)) { 3793 update_mmu_cache(vma, vmf->address, vmf->pte); 3794 goto release; 3795 } 3796 3797 ret = check_stable_address_space(vma->vm_mm); 3798 if (ret) 3799 goto release; 3800 3801 /* Deliver the page fault to userland, check inside PT lock */ 3802 if (userfaultfd_missing(vma)) { 3803 pte_unmap_unlock(vmf->pte, vmf->ptl); 3804 put_page(page); 3805 return handle_userfault(vmf, VM_UFFD_MISSING); 3806 } 3807 3808 inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES); 3809 page_add_new_anon_rmap(page, vma, vmf->address, false); 3810 lru_cache_add_inactive_or_unevictable(page, vma); 3811 setpte: 3812 set_pte_at(vma->vm_mm, vmf->address, vmf->pte, entry); 3813 3814 /* No need to invalidate - it was non-present before */ 3815 update_mmu_cache(vma, vmf->address, vmf->pte); 3816 unlock: 3817 pte_unmap_unlock(vmf->pte, vmf->ptl); 3818 return ret; 3819 release: 3820 put_page(page); 3821 goto unlock; 3822 oom_free_page: 3823 put_page(page); 3824 oom: 3825 return VM_FAULT_OOM; 3826 } 3827 3828 /* 3829 * The mmap_lock must have been held on entry, and may have been 3830 * released depending on flags and vma->vm_ops->fault() return value. 3831 * See filemap_fault() and __lock_page_retry(). 3832 */ 3834 { 3835 struct vm_area_struct *vma = vmf->vma; 3836 vm_fault_t ret; 3837 3838 /* 3839 * Preallocate pte before we take page_lock because this might lead to 3840 * deadlocks for memcg reclaim which waits for pages under writeback: 3841 * lock_page(A) 3842 * SetPageWriteback(A) 3843 * unlock_page(A) 3844 * lock_page(B) 3845 * lock_page(B) 3846 * pte_alloc_one 3847 * shrink_page_list 3848 * wait_on_page_writeback(A) 3849 * SetPageWriteback(B) 3850 * unlock_page(B) 3851 * # flush A, B to clear the writeback 3852 */ 3853 if (pmd_none(*vmf->pmd) && !vmf->prealloc_pte) { 3854 vmf->prealloc_pte = pte_alloc_one(vma->vm_mm); 3855 if (!vmf->prealloc_pte) 3856 return VM_FAULT_OOM; 3857 smp_wmb(); /* See comment in __pte_alloc() */ 3858 } 3859 3860 ret = vma->vm_ops->fault(vmf); 3861 if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY | 3862 VM_FAULT_DONE_COW))) 3863 return ret; 3864 3865 if (unlikely(PageHWPoison(vmf->page))) { 3866 if (ret & VM_FAULT_LOCKED) 3867 unlock_page(vmf->page); 3868 put_page(vmf->page); 3869 vmf->page = NULL; 3870 return VM_FAULT_HWPOISON; 3871 } 3872 3873 if (unlikely(!(ret & VM_FAULT_LOCKED))) 3874 lock_page(vmf->page); 3875 else 3876 VM_BUG_ON_PAGE(!PageLocked(vmf->page), vmf->page); 3877 3878 return ret; 3879 } 3880 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org