From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============0384181019782869537==" MIME-Version: 1.0 From: kernel test robot Subject: [hnaz-mm:master 291/410] mm/mmap.c:850 __vma_adjust() error: uninitialized symbol 'next_next'. Date: Sat, 30 Apr 2022 07:15:35 +0800 Message-ID: <202204300714.hs00NRDM-lkp@intel.com> List-Id: To: kbuild@lists.01.org --===============0384181019782869537== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable CC: kbuild-all(a)lists.01.org BCC: lkp(a)intel.com CC: linux-kernel(a)vger.kernel.org TO: "Liam R. Howlett" CC: Johannes Weiner CC: Andrew Morton CC: Linux Memory Management List tree: https://github.com/hnaz/linux-mm master head: bf4803abaa3e9d2fa207c0675a2d2abf0fd44f66 commit: 48c8a6f751a2c87c2dcfa40442e0ebe3afd7cd76 [291/410] mm: remove rb tr= ee. :::::: branch date: 3 days ago :::::: commit date: 3 days ago config: x86_64-randconfig-m001-20220425 (https://download.01.org/0day-ci/ar= chive/20220430/202204300714.hs00NRDM-lkp(a)intel.com/config) compiler: gcc-11 (Debian 11.2.0-20) 11.2.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot Reported-by: Dan Carpenter smatch warnings: mm/mmap.c:850 __vma_adjust() error: uninitialized symbol 'next_next'. vim +/next_next +850 mm/mmap.c ^1da177e4c3f415 Linus Torvalds 2005-04-16 608 = ^1da177e4c3f415 Linus Torvalds 2005-04-16 609 /* ^1da177e4c3f415 Linus Torvalds 2005-04-16 610 * We cannot adjust = vm_start, vm_end, vm_pgoff fields of a vma that ^1da177e4c3f415 Linus Torvalds 2005-04-16 611 * is already presen= t in an i_mmap tree without adjusting the tree. ^1da177e4c3f415 Linus Torvalds 2005-04-16 612 * The following hel= per function should be used when such adjustments ^1da177e4c3f415 Linus Torvalds 2005-04-16 613 * are necessary. T= he "insert" vma (if any) is to be inserted ^1da177e4c3f415 Linus Torvalds 2005-04-16 614 * before we drop th= e necessary locks. ^1da177e4c3f415 Linus Torvalds 2005-04-16 615 */ e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 616 int __vma_adjust(str= uct vm_area_struct *vma, unsigned long start, e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 617 unsigned long end, = pgoff_t pgoff, struct vm_area_struct *insert, e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 618 struct vm_area_stru= ct *expand) ^1da177e4c3f415 Linus Torvalds 2005-04-16 619 { ^1da177e4c3f415 Linus Torvalds 2005-04-16 620 struct mm_struct *m= m =3D vma->vm_mm; 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 621 struct vm_area_stru= ct *next_next, *next =3D find_vma(mm, vma->vm_end); 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 622 struct vm_area_stru= ct *orig_vma =3D vma; ^1da177e4c3f415 Linus Torvalds 2005-04-16 623 struct address_spac= e *mapping =3D NULL; f808c13fd373894 Davidlohr Bueso 2017-09-08 624 struct rb_root_cach= ed *root =3D NULL; 012f18004da33ba Rik van Riel 2010-08-09 625 struct anon_vma *an= on_vma =3D NULL; ^1da177e4c3f415 Linus Torvalds 2005-04-16 626 struct file *file = =3D vma->vm_file; 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 627 bool vma_changed = =3D false; ^1da177e4c3f415 Linus Torvalds 2005-04-16 628 long adjust_next = =3D 0; ^1da177e4c3f415 Linus Torvalds 2005-04-16 629 int remove_next =3D= 0; f90a08f5f1a5029 Liam R. Howlett 2022-04-26 630 MA_STATE(mas, &mm->= mm_mt, 0, 0); 734537c9cb725fc Kirill A. Shutemov 2016-07-28 631 struct vm_area_stru= ct *exporter =3D NULL, *importer =3D NULL; 287d97ac0321367 Linus Torvalds 2010-04-10 632 = f90a08f5f1a5029 Liam R. Howlett 2022-04-26 633 if (next && !insert= ) { ^1da177e4c3f415 Linus Torvalds 2005-04-16 634 if (end >=3D next-= >vm_end) { ^1da177e4c3f415 Linus Torvalds 2005-04-16 635 /* ^1da177e4c3f415 Linus Torvalds 2005-04-16 636 * vma expands, o= verlapping all the next, and ^1da177e4c3f415 Linus Torvalds 2005-04-16 637 * perhaps the on= e after too (mprotect case 6). 86d12e471d9f152 Andrea Arcangeli 2016-10-07 638 * The only other= cases that gets here are e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 639 * case 1, case 7= and case 8. e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 640 */ e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 641 if (next =3D=3D e= xpand) { e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 642 /* e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 643 * The only case= where we don't expand "vma" e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 644 * and we expand= "next" instead is case 8. e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 645 */ e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 646 VM_WARN_ON(end != =3D next->vm_end); e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 647 /* e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 648 * remove_next = =3D=3D 3 means we're e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 649 * removing "vma= " and that to do so we e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 650 * swapped "vma"= and "next". e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 651 */ e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 652 remove_next =3D = 3; e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 653 VM_WARN_ON(file = !=3D next->vm_file); e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 654 swap(vma, next); e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 655 } else { e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 656 VM_WARN_ON(expan= d !=3D vma); e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 657 /* e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 658 * case 1, 6, 7,= remove_next =3D=3D 2 is case 6, e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 659 * remove_next = =3D=3D 1 is case 1 or 7. ^1da177e4c3f415 Linus Torvalds 2005-04-16 660 */ 734537c9cb725fc Kirill A. Shutemov 2016-07-28 661 remove_next =3D = 1 + (end > next->vm_end); 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 662 next_next =3D fi= nd_vma(mm, next->vm_end); e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 663 VM_WARN_ON(remov= e_next =3D=3D 2 && 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 664 end !=3D nex= t_next->vm_end); e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 665 /* trim end to n= ext, for case 6 first pass */ ^1da177e4c3f415 Linus Torvalds 2005-04-16 666 end =3D next->vm= _end; e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 667 } e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 668 = 287d97ac0321367 Linus Torvalds 2010-04-10 669 exporter =3D next; ^1da177e4c3f415 Linus Torvalds 2005-04-16 670 importer =3D vma; 734537c9cb725fc Kirill A. Shutemov 2016-07-28 671 = 734537c9cb725fc Kirill A. Shutemov 2016-07-28 672 /* 734537c9cb725fc Kirill A. Shutemov 2016-07-28 673 * If next doesn'= t have anon_vma, import from vma after 734537c9cb725fc Kirill A. Shutemov 2016-07-28 674 * next, if the v= ma overlaps with it. 734537c9cb725fc Kirill A. Shutemov 2016-07-28 675 */ 97a42cd4398162a Andrea Arcangeli 2016-10-07 676 if (remove_next = =3D=3D 2 && !next->anon_vma) 734537c9cb725fc Kirill A. Shutemov 2016-07-28 677 exporter =3D nex= t->vm_next; 734537c9cb725fc Kirill A. Shutemov 2016-07-28 678 = ^1da177e4c3f415 Linus Torvalds 2005-04-16 679 } else if (end > n= ext->vm_start) { ^1da177e4c3f415 Linus Torvalds 2005-04-16 680 /* ^1da177e4c3f415 Linus Torvalds 2005-04-16 681 * vma expands, o= verlapping part of the next: ^1da177e4c3f415 Linus Torvalds 2005-04-16 682 * mprotect case = 5 shifting the boundary up. ^1da177e4c3f415 Linus Torvalds 2005-04-16 683 */ f9d86a60572295e Wei Yang 2020-10-13 684 adjust_next =3D (= end - next->vm_start); 287d97ac0321367 Linus Torvalds 2010-04-10 685 exporter =3D next; ^1da177e4c3f415 Linus Torvalds 2005-04-16 686 importer =3D vma; e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 687 VM_WARN_ON(expand= !=3D importer); ^1da177e4c3f415 Linus Torvalds 2005-04-16 688 } else if (end < v= ma->vm_end) { ^1da177e4c3f415 Linus Torvalds 2005-04-16 689 /* ^1da177e4c3f415 Linus Torvalds 2005-04-16 690 * vma shrinks, a= nd !insert tells it's not ^1da177e4c3f415 Linus Torvalds 2005-04-16 691 * split_vma inse= rting another: so it must be ^1da177e4c3f415 Linus Torvalds 2005-04-16 692 * mprotect case = 4 shifting the boundary down. ^1da177e4c3f415 Linus Torvalds 2005-04-16 693 */ f9d86a60572295e Wei Yang 2020-10-13 694 adjust_next =3D -= (vma->vm_end - end); 287d97ac0321367 Linus Torvalds 2010-04-10 695 exporter =3D vma; ^1da177e4c3f415 Linus Torvalds 2005-04-16 696 importer =3D next; e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 697 VM_WARN_ON(expand= !=3D importer); ^1da177e4c3f415 Linus Torvalds 2005-04-16 698 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 699 = 5beb49305251e56 Rik van Riel 2010-03-05 700 /* 5beb49305251e56 Rik van Riel 2010-03-05 701 * Easily overlook= ed: when mprotect shifts the boundary, 5beb49305251e56 Rik van Riel 2010-03-05 702 * make sure the e= xpanding vma has anon_vma set if the 5beb49305251e56 Rik van Riel 2010-03-05 703 * shrinking vma h= ad, to cover any anon pages imported. 5beb49305251e56 Rik van Riel 2010-03-05 704 */ 287d97ac0321367 Linus Torvalds 2010-04-10 705 if (exporter && ex= porter->anon_vma && !importer->anon_vma) { c4ea95d7cd08d9f Daniel Forrest 2014-12-02 706 int error; c4ea95d7cd08d9f Daniel Forrest 2014-12-02 707 = b800c91a0517071 Konstantin Khlebnikov 2015-01-11 708 importer->anon_vm= a =3D exporter->anon_vma; c4ea95d7cd08d9f Daniel Forrest 2014-12-02 709 error =3D anon_vm= a_clone(importer, exporter); 3fe89b3e2a7bbf3 Leon Yu 2015-03-25 710 if (error) c4ea95d7cd08d9f Daniel Forrest 2014-12-02 711 return error; b800c91a0517071 Konstantin Khlebnikov 2015-01-11 712 } 5beb49305251e56 Rik van Riel 2010-03-05 713 } 734537c9cb725fc Kirill A. Shutemov 2016-07-28 714 again: e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 715 vma_adjust_trans_hu= ge(orig_vma, start, end, adjust_next); 37f9f5595c26d3c Kirill A. Shutemov 2016-07-26 716 = f90a08f5f1a5029 Liam R. Howlett 2022-04-26 717 if (mas_preallocate= (&mas, vma, GFP_KERNEL)) { f90a08f5f1a5029 Liam R. Howlett 2022-04-26 718 if (exporter && ex= porter->anon_vma) f90a08f5f1a5029 Liam R. Howlett 2022-04-26 719 unlink_anon_vmas(= importer); f90a08f5f1a5029 Liam R. Howlett 2022-04-26 720 return -ENOMEM; f90a08f5f1a5029 Liam R. Howlett 2022-04-26 721 } f90a08f5f1a5029 Liam R. Howlett 2022-04-26 722 = ^1da177e4c3f415 Linus Torvalds 2005-04-16 723 if (file) { ^1da177e4c3f415 Linus Torvalds 2005-04-16 724 mapping =3D file->= f_mapping; ^1da177e4c3f415 Linus Torvalds 2005-04-16 725 root =3D &mapping-= >i_mmap; cbc91f71b51b833 Srikar Dronamraju 2012-04-11 726 uprobe_munmap(vma,= vma->vm_start, vma->vm_end); 682968e0c425c60 Srikar Dronamraju 2012-03-30 727 = 682968e0c425c60 Srikar Dronamraju 2012-03-30 728 if (adjust_next) 27ba0644ea9dfe6 Kirill A. Shutemov 2015-02-10 729 uprobe_munmap(nex= t, next->vm_start, next->vm_end); 682968e0c425c60 Srikar Dronamraju 2012-03-30 730 = 83cde9e8ba95d18 Davidlohr Bueso 2014-12-12 731 i_mmap_lock_write(= mapping); ^1da177e4c3f415 Linus Torvalds 2005-04-16 732 if (insert) { ^1da177e4c3f415 Linus Torvalds 2005-04-16 733 /* 6b2dbba8b6ac4df Michel Lespinasse 2012-10-08 734 * Put into inter= val tree now, so instantiated pages ^1da177e4c3f415 Linus Torvalds 2005-04-16 735 * are visible to= arm/parisc __flush_dcache_page ^1da177e4c3f415 Linus Torvalds 2005-04-16 736 * throughout; bu= t we cannot insert into address ^1da177e4c3f415 Linus Torvalds 2005-04-16 737 * space until vm= a start or end is updated. ^1da177e4c3f415 Linus Torvalds 2005-04-16 738 */ ^1da177e4c3f415 Linus Torvalds 2005-04-16 739 __vma_link_file(i= nsert); ^1da177e4c3f415 Linus Torvalds 2005-04-16 740 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 741 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 742 = 012f18004da33ba Rik van Riel 2010-08-09 743 anon_vma =3D vma->a= non_vma; bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 744 if (!anon_vma && ad= just_next) bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 745 anon_vma =3D next-= >anon_vma; bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 746 if (anon_vma) { e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 747 VM_WARN_ON(adjust_= next && next->anon_vma && e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 748 anon_vma !=3D = next->anon_vma); 4fc3f1d66b1ef0d Ingo Molnar 2012-12-02 749 anon_vma_lock_writ= e(anon_vma); bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 750 anon_vma_interval_= tree_pre_update_vma(vma); bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 751 if (adjust_next) bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 752 anon_vma_interval= _tree_pre_update_vma(next); bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 753 } 012f18004da33ba Rik van Riel 2010-08-09 754 = 0fc48a6e213ab8e Wei Yang 2020-10-13 755 if (file) { ^1da177e4c3f415 Linus Torvalds 2005-04-16 756 flush_dcache_mmap_= lock(mapping); 6b2dbba8b6ac4df Michel Lespinasse 2012-10-08 757 vma_interval_tree_= remove(vma, root); ^1da177e4c3f415 Linus Torvalds 2005-04-16 758 if (adjust_next) 6b2dbba8b6ac4df Michel Lespinasse 2012-10-08 759 vma_interval_tree= _remove(next, root); ^1da177e4c3f415 Linus Torvalds 2005-04-16 760 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 761 = d37371870ceb1d2 Michel Lespinasse 2012-12-11 762 if (start !=3D vma-= >vm_start) { 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 763 if (vma->vm_start = < start) 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 764 vma_mt_szero(mm, = vma->vm_start, start); 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 765 else 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 766 vma_changed =3D t= rue; ^1da177e4c3f415 Linus Torvalds 2005-04-16 767 vma->vm_start =3D = start; d37371870ceb1d2 Michel Lespinasse 2012-12-11 768 } d37371870ceb1d2 Michel Lespinasse 2012-12-11 769 if (end !=3D vma->v= m_end) { 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 770 if (vma->vm_end > = end) 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 771 vma_mt_szero(mm, = end, vma->vm_end); 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 772 else 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 773 vma_changed =3D t= rue; ^1da177e4c3f415 Linus Torvalds 2005-04-16 774 vma->vm_end =3D en= d; 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 775 if (!next) 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 776 mm->highest_vm_en= d =3D vm_end_gap(vma); d37371870ceb1d2 Michel Lespinasse 2012-12-11 777 } f90a08f5f1a5029 Liam R. Howlett 2022-04-26 778 = 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 779 if (vma_changed) f90a08f5f1a5029 Liam R. Howlett 2022-04-26 780 vma_mas_store(vma,= &mas); f90a08f5f1a5029 Liam R. Howlett 2022-04-26 781 = ^1da177e4c3f415 Linus Torvalds 2005-04-16 782 vma->vm_pgoff =3D p= goff; ^1da177e4c3f415 Linus Torvalds 2005-04-16 783 if (adjust_next) { f9d86a60572295e Wei Yang 2020-10-13 784 next->vm_start += =3D adjust_next; f9d86a60572295e Wei Yang 2020-10-13 785 next->vm_pgoff += =3D adjust_next >> PAGE_SHIFT; f90a08f5f1a5029 Liam R. Howlett 2022-04-26 786 vma_mas_store(next= , &mas); ^1da177e4c3f415 Linus Torvalds 2005-04-16 787 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 788 = 0fc48a6e213ab8e Wei Yang 2020-10-13 789 if (file) { ^1da177e4c3f415 Linus Torvalds 2005-04-16 790 if (adjust_next) 6b2dbba8b6ac4df Michel Lespinasse 2012-10-08 791 vma_interval_tree= _insert(next, root); 6b2dbba8b6ac4df Michel Lespinasse 2012-10-08 792 vma_interval_tree_= insert(vma, root); ^1da177e4c3f415 Linus Torvalds 2005-04-16 793 flush_dcache_mmap_= unlock(mapping); ^1da177e4c3f415 Linus Torvalds 2005-04-16 794 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 795 = ^1da177e4c3f415 Linus Torvalds 2005-04-16 796 if (remove_next) { 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 797 __vma_unlink_list(= mm, next); 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 798 /* Kill the cache = */ 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 799 vmacache_invalidat= e(mm); ^1da177e4c3f415 Linus Torvalds 2005-04-16 800 if (file) ^1da177e4c3f415 Linus Torvalds 2005-04-16 801 __remove_shared_v= m_struct(next, file, mapping); ^1da177e4c3f415 Linus Torvalds 2005-04-16 802 } else if (insert) { ^1da177e4c3f415 Linus Torvalds 2005-04-16 803 /* ^1da177e4c3f415 Linus Torvalds 2005-04-16 804 * split_vma has s= plit insert from vma, and needs ^1da177e4c3f415 Linus Torvalds 2005-04-16 805 * us to insert it= before dropping the locks ^1da177e4c3f415 Linus Torvalds 2005-04-16 806 * (it may either = follow vma or precede it). ^1da177e4c3f415 Linus Torvalds 2005-04-16 807 */ f90a08f5f1a5029 Liam R. Howlett 2022-04-26 808 __insert_vm_struct= (mm, &mas, insert); ^1da177e4c3f415 Linus Torvalds 2005-04-16 809 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 810 = bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 811 if (anon_vma) { bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 812 anon_vma_interval_= tree_post_update_vma(vma); bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 813 if (adjust_next) bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 814 anon_vma_interval= _tree_post_update_vma(next); 08b52706d505658 Konstantin Khlebnikov 2013-02-22 815 anon_vma_unlock_wr= ite(anon_vma); bf181b9f9d8dfbb Michel Lespinasse 2012-10-08 816 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 817 = 0fc48a6e213ab8e Wei Yang 2020-10-13 818 if (file) { 808fbdbea05f1e9 Wei Yang 2020-10-13 819 i_mmap_unlock_writ= e(mapping); 7b2d81d48a2d8e3 Ingo Molnar 2012-02-17 820 uprobe_mmap(vma); 2b144498350860b Srikar Dronamraju 2012-02-09 821 = 2b144498350860b Srikar Dronamraju 2012-02-09 822 if (adjust_next) 7b2d81d48a2d8e3 Ingo Molnar 2012-02-17 823 uprobe_mmap(next); 2b144498350860b Srikar Dronamraju 2012-02-09 824 } 2b144498350860b Srikar Dronamraju 2012-02-09 825 = ^1da177e4c3f415 Linus Torvalds 2005-04-16 826 if (remove_next) { 925d1c401fa6cfd Matt Helsley 2008-04-29 827 if (file) { cbc91f71b51b833 Srikar Dronamraju 2012-04-11 828 uprobe_munmap(nex= t, next->vm_start, next->vm_end); ^1da177e4c3f415 Linus Torvalds 2005-04-16 829 fput(file); 925d1c401fa6cfd Matt Helsley 2008-04-29 830 } 5beb49305251e56 Rik van Riel 2010-03-05 831 if (next->anon_vma) 5beb49305251e56 Rik van Riel 2010-03-05 832 anon_vma_merge(vm= a, next); ^1da177e4c3f415 Linus Torvalds 2005-04-16 833 mm->map_count--; 3964acd0dbec123 Oleg Nesterov 2013-07-31 834 mpol_put(vma_polic= y(next)); 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 835 BUG_ON(vma->vm_end= < next->vm_end); 3928d4f5ee37cdc Linus Torvalds 2018-07-21 836 vm_area_free(next); 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 837 = ^1da177e4c3f415 Linus Torvalds 2005-04-16 838 /* ^1da177e4c3f415 Linus Torvalds 2005-04-16 839 * In mprotect's c= ase 6 (see comments on vma_merge), ^1da177e4c3f415 Linus Torvalds 2005-04-16 840 * we must remove = another next too. It would clutter ^1da177e4c3f415 Linus Torvalds 2005-04-16 841 * up the code too= much to do both in one go. ^1da177e4c3f415 Linus Torvalds 2005-04-16 842 */ e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 843 if (remove_next != =3D 3) { e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 844 /* e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 845 * If "next" was = removed and vma->vm_end was e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 846 * expanded (up) = over it, in turn e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 847 * "next->vm_prev= ->vm_end" changed and the e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 848 * "vma->vm_next"= gap must be updated. e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 849 */ 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 @850 next =3D next_nex= t; e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 851 } else { e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 852 /* e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 853 * For the scope = of the comment "next" and e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 854 * "vma" consider= ed pre-swap(): if "vma" was e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 855 * removed, next-= >vm_start was expanded (down) e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 856 * over it and th= e "next" gap must be updated. e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 857 * Because of the= swap() the post-swap() "vma" e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 858 * actually point= s to pre-swap() "next" e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 859 * (post-swap() "= next" as opposed is now a e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 860 * dangling point= er). e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 861 */ e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 862 next =3D vma; e86f15ee64d8ee4 Andrea Arcangeli 2016-10-07 863 } 734537c9cb725fc Kirill A. Shutemov 2016-07-28 864 if (remove_next = =3D=3D 2) { 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 865 mas_reset(&mas); 734537c9cb725fc Kirill A. Shutemov 2016-07-28 866 remove_next =3D 1; 734537c9cb725fc Kirill A. Shutemov 2016-07-28 867 end =3D next->vm_= end; ^1da177e4c3f415 Linus Torvalds 2005-04-16 868 goto again; 48c8a6f751a2c87 Liam R. Howlett 2022-04-26 869 } else if (!next) { fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 870 /* fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 871 * If remove_next= =3D=3D 2 we obviously can't fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 872 * reach this pat= h. fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 873 * fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 874 * If remove_next= =3D=3D 3 we can't reach this fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 875 * path because p= re-swap() next is always not fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 876 * NULL. pre-swap= () "next" is not being fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 877 * removed and it= s next->vm_end is not altered fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 878 * (and furthermo= re "end" already matches fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 879 * next->vm_end i= n remove_next =3D=3D 3). fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 880 * fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 881 * We reach this = only in the remove_next =3D=3D 1 fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 882 * case if the "n= ext" vma that was removed was fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 883 * the highest vm= a of the mm. However in such fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 884 * case next->vm_= end =3D=3D "end" and the extended fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 885 * "vma" has vma-= >vm_end =3D=3D next->vm_end so fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 886 * mm->highest_vm= _end doesn't need any update fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 887 * in remove_next= =3D=3D 1 case. fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 888 */ 1be7107fbe18eed Hugh Dickins 2017-06-19 889 VM_WARN_ON(mm->hi= ghest_vm_end !=3D vm_end_gap(vma)); fb8c41e9ad1f356 Andrea Arcangeli 2016-10-07 890 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 891 } 2b144498350860b Srikar Dronamraju 2012-02-09 892 if (insert && file) 7b2d81d48a2d8e3 Ingo Molnar 2012-02-17 893 uprobe_mmap(insert= ); ^1da177e4c3f415 Linus Torvalds 2005-04-16 894 = ^1da177e4c3f415 Linus Torvalds 2005-04-16 895 validate_mm(mm); 5beb49305251e56 Rik van Riel 2010-03-05 896 return 0; ^1da177e4c3f415 Linus Torvalds 2005-04-16 897 } ^1da177e4c3f415 Linus Torvalds 2005-04-16 898 = -- = 0-DAY CI Kernel Test Service https://01.org/lkp --===============0384181019782869537==--