On Wed, Mar 8, 2023 at 1:52 AM kernel test robot lkp@intel.com wrote:
Hi Axel,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master] [also build test ERROR on v6.3-rc1] [cannot apply to akpm-mm/mm-everything next-20230308] [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/Axel-Rasmussen/mm-userfaultfd... patch link: https://lore.kernel.org/r/20230306225024.264858-5-axelrasmussen%40google.com patch subject: [PATCH v3 4/5] mm: userfaultfd: don't separate addr + len arguments config: x86_64-randconfig-a011-20230306 (https://download.01.org/0day-ci/archive/20230308/202303081703.nwxAgIVH-lkp@i...) compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1) 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/intel-lab-lkp/linux/commit/cee642b93be3ae01c7cc737c0176cb... git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Axel-Rasmussen/mm-userfaultfd-rename-functions-for-clarity-consistency/20230307-065203 git checkout cee642b93be3ae01c7cc737c0176cbc16074a25a # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot lkp@intel.com | Link: https://lore.kernel.org/oe-kbuild-all/202303081703.nwxAgIVH-lkp@intel.com/
All errors (new ones prefixed by >>):
mm/userfaultfd.c:577:52: error: passing 'const struct uffdio_range *' to parameter of incompatible type 'struct uffdio_range'
return mfill_atomic_hugetlb(dst_vma, src_start, dst, flags); ^~~mm/userfaultfd.c:463:29: note: passing argument to parameter 'dst' here struct uffdio_range dst, ^ 1 error generated.
Whoops. :) I admittedly didn't test with !CONFIG_HUGETLB_PAGE.
The next version of this series will drop this patch as per discussion though, so the issue is moot.
vim +577 mm/userfaultfd.c
508 509 static __always_inline ssize_t mfill_atomic(struct mm_struct *dst_mm, 510 unsigned long src_start, 511 const struct uffdio_range *dst, 512 atomic_t *mmap_changing, 513 uffd_flags_t flags) 514 { 515 struct vm_area_struct *dst_vma; 516 ssize_t err; 517 pmd_t *dst_pmd; 518 unsigned long src_addr, dst_addr; 519 long copied; 520 struct page *page; 521 522 /* 523 * Sanitize the command parameters: 524 */ 525 BUG_ON(dst->start & ~PAGE_MASK); 526 BUG_ON(dst->len & ~PAGE_MASK); 527 528 /* Does the address range wrap, or is the span zero-sized? */ 529 BUG_ON(src_start + dst->len <= src_start); 530 BUG_ON(dst->start + dst->len <= dst->start); 531 532 src_addr = src_start; 533 dst_addr = dst->start; 534 copied = 0; 535 page = NULL; 536 retry: 537 mmap_read_lock(dst_mm); 538 539 /* 540 * If memory mappings are changing because of non-cooperative 541 * operation (e.g. mremap) running in parallel, bail out and 542 * request the user to retry later 543 */ 544 err = -EAGAIN; 545 if (mmap_changing && atomic_read(mmap_changing)) 546 goto out_unlock; 547 548 /* 549 * Make sure the vma is not shared, that the dst range is 550 * both valid and fully within a single existing vma. 551 */ 552 err = -ENOENT; 553 dst_vma = find_dst_vma(dst_mm, dst); 554 if (!dst_vma) 555 goto out_unlock; 556 557 err = -EINVAL; 558 /* 559 * shmem_zero_setup is invoked in mmap for MAP_ANONYMOUS|MAP_SHARED but 560 * it will overwrite vm_ops, so vma_is_anonymous must return false. 561 */ 562 if (WARN_ON_ONCE(vma_is_anonymous(dst_vma) && 563 dst_vma->vm_flags & VM_SHARED)) 564 goto out_unlock; 565 566 /* 567 * validate 'mode' now that we know the dst_vma: don't allow 568 * a wrprotect copy if the userfaultfd didn't register as WP. 569 */ 570 if ((flags & MFILL_ATOMIC_WP) && !(dst_vma->vm_flags & VM_UFFD_WP)) 571 goto out_unlock; 572 573 /* 574 * If this is a HUGETLB vma, pass off to appropriate routine 575 */ 576 if (is_vm_hugetlb_page(dst_vma))
577 return mfill_atomic_hugetlb(dst_vma, src_start, dst, flags);
578 579 if (!vma_is_anonymous(dst_vma) && !vma_is_shmem(dst_vma)) 580 goto out_unlock; 581 if (!vma_is_shmem(dst_vma) && 582 (flags & MFILL_ATOMIC_MODE_MASK) == MFILL_ATOMIC_CONTINUE) 583 goto out_unlock; 584 585 /* 586 * Ensure the dst_vma has a anon_vma or this page 587 * would get a NULL anon_vma when moved in the 588 * dst_vma. 589 */ 590 err = -ENOMEM; 591 if (!(dst_vma->vm_flags & VM_SHARED) && 592 unlikely(anon_vma_prepare(dst_vma))) 593 goto out_unlock; 594 595 while (src_addr < src_start + dst->len) { 596 pmd_t dst_pmdval; 597 598 BUG_ON(dst_addr >= dst->start + dst->len); 599 600 dst_pmd = mm_alloc_pmd(dst_mm, dst_addr); 601 if (unlikely(!dst_pmd)) { 602 err = -ENOMEM; 603 break; 604 } 605 606 dst_pmdval = pmdp_get_lockless(dst_pmd); 607 /* 608 * If the dst_pmd is mapped as THP don't 609 * override it and just be strict. 610 */ 611 if (unlikely(pmd_trans_huge(dst_pmdval))) { 612 err = -EEXIST; 613 break; 614 } 615 if (unlikely(pmd_none(dst_pmdval)) && 616 unlikely(__pte_alloc(dst_mm, dst_pmd))) { 617 err = -ENOMEM; 618 break; 619 } 620 /* If an huge pmd materialized from under us fail */ 621 if (unlikely(pmd_trans_huge(*dst_pmd))) { 622 err = -EFAULT; 623 break; 624 } 625 626 BUG_ON(pmd_none(*dst_pmd)); 627 BUG_ON(pmd_trans_huge(*dst_pmd)); 628 629 err = mfill_atomic_pte(dst_pmd, dst_vma, dst_addr, 630 src_addr, &page, flags); 631 cond_resched(); 632 633 if (unlikely(err == -ENOENT)) { 634 void *page_kaddr; 635 636 mmap_read_unlock(dst_mm); 637 BUG_ON(!page); 638 639 page_kaddr = kmap_local_page(page); 640 err = copy_from_user(page_kaddr, 641 (const void __user *) src_addr, 642 PAGE_SIZE); 643 kunmap_local(page_kaddr); 644 if (unlikely(err)) { 645 err = -EFAULT; 646 goto out; 647 } 648 flush_dcache_page(page); 649 goto retry; 650 } else 651 BUG_ON(page); 652 653 if (!err) { 654 dst_addr += PAGE_SIZE; 655 src_addr += PAGE_SIZE; 656 copied += PAGE_SIZE; 657 658 if (fatal_signal_pending(current)) 659 err = -EINTR; 660 } 661 if (err) 662 break; 663 } 664 665 out_unlock: 666 mmap_read_unlock(dst_mm); 667 out: 668 if (page) 669 put_page(page); 670 BUG_ON(copied < 0); 671 BUG_ON(err > 0); 672 BUG_ON(!copied && !err); 673 return copied ? copied : err; 674 } 675
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