From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2D6DC27C76 for ; Sat, 21 Jan 2023 01:07:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229639AbjAUBH6 (ORCPT ); Fri, 20 Jan 2023 20:07:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32972 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229853AbjAUBHc (ORCPT ); Fri, 20 Jan 2023 20:07:32 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9DD0073ED7 for ; Fri, 20 Jan 2023 17:07:29 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 596DCB829E7 for ; Sat, 21 Jan 2023 01:07:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 064F2C433D2; Sat, 21 Jan 2023 01:07:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1674263247; bh=uMGegKXT1P4Omv1VjQ30rfGnbqllcjoF/l2i4ISXTGo=; h=Date:To:From:Subject:From; b=e1UEOy69HWGfHwPc0BlaPvkhIFXcx3H2QG2EnPhUyazvfJmQHmM85PpQOuZZzv+FL apDiO5BKaWN8CWoXMjkxCEsnvI9nL70hhfJuz7c5o0zaAilZqSWmpu+D3KJ01GU+T3 EcWHjBv2JTxs+NFf8+43SBdIsIsWCeam5uMg/LYY= Date: Fri, 20 Jan 2023 17:07:26 -0800 To: mm-commits@vger.kernel.org, Liam.Howlett@oracle.com, Liam.Howlett@Oracle.com, akpm@linux-foundation.org From: Andrew Morton Subject: + mm-mmap-introduce-dup_vma_anon-helper.patch added to mm-unstable branch Message-Id: <20230121010727.064F2C433D2@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm/mmap: introduce dup_vma_anon() helper has been added to the -mm mm-unstable branch. Its filename is mm-mmap-introduce-dup_vma_anon-helper.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mmap-introduce-dup_vma_anon-helper.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: "Liam R. Howlett" Subject: mm/mmap: introduce dup_vma_anon() helper Date: Fri, 20 Jan 2023 11:26:47 -0500 Create a helper for duplicating the anon vma when adjusting the vma. This simplifies the logic of __vma_adjust(). Link: https://lkml.kernel.org/r/20230120162650.984577-47-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Signed-off-by: Andrew Morton --- --- a/mm/mmap.c~mm-mmap-introduce-dup_vma_anon-helper +++ a/mm/mmap.c @@ -621,6 +621,29 @@ again: } /* + * dup_anon_vma() - Helper function to duplicate anon_vma + * @dst: The destination VMA + * @src: The source VMA + * + * Returns: 0 on success. + */ +static inline int dup_anon_vma(struct vm_area_struct *dst, + struct vm_area_struct *src) +{ + /* + * Easily overlooked: when mprotect shifts the boundary, make sure the + * expanding vma has anon_vma set if the shrinking vma had, to cover any + * anon pages imported. + */ + if (src->anon_vma && !dst->anon_vma) { + dst->anon_vma = src->anon_vma; + return anon_vma_clone(dst, src); + } + + return 0; +} + +/* * vma_expand - Expand an existing VMA * * @vmi: The vma iterator @@ -645,15 +668,12 @@ int vma_expand(struct vma_iterator *vmi, struct vma_prepare vp; if (next && (vma != next) && (end == next->vm_end)) { - remove_next = true; - if (next->anon_vma && !vma->anon_vma) { - int error; + int ret; - vma->anon_vma = next->anon_vma; - error = anon_vma_clone(vma, next); - if (error) - return error; - } + remove_next = true; + ret = dup_anon_vma(vma, next); + if (ret) + return ret; } init_multi_vma_prep(&vp, vma, NULL, remove_next ? next : NULL, NULL); @@ -742,10 +762,11 @@ int __vma_adjust(struct vma_iterator *vm struct file *file = vma->vm_file; bool vma_changed = false; long adjust_next = 0; - struct vm_area_struct *exporter = NULL, *importer = NULL; struct vma_prepare vma_prep; if (next) { + int error = 0; + if (end >= next->vm_end) { /* * vma expands, overlapping all the next, and @@ -780,15 +801,14 @@ int __vma_adjust(struct vma_iterator *vm end != remove2->vm_end); } - exporter = next; - importer = vma; - /* * If next doesn't have anon_vma, import from vma after * next, if the vma overlaps with it. */ - if (remove2 != NULL && !next->anon_vma) - exporter = remove2; + if (remove != NULL && !next->anon_vma) + error = dup_anon_vma(vma, remove2); + else + error = dup_anon_vma(vma, remove); } else if (end > next->vm_start) { /* @@ -796,9 +816,8 @@ int __vma_adjust(struct vma_iterator *vm * mprotect case 5 shifting the boundary up. */ adjust_next = (end - next->vm_start); - exporter = next; - importer = vma; - VM_WARN_ON(expand != importer); + VM_WARN_ON(expand != vma); + error = dup_anon_vma(vma, next); } else if (end < vma->vm_end) { /* * vma shrinks, and !insert tells it's not @@ -806,24 +825,11 @@ int __vma_adjust(struct vma_iterator *vm * mprotect case 4 shifting the boundary down. */ adjust_next = -(vma->vm_end - end); - exporter = vma; - importer = next; - VM_WARN_ON(expand != importer); - } - - /* - * Easily overlooked: when mprotect shifts the boundary, - * make sure the expanding vma has anon_vma set if the - * shrinking vma had, to cover any anon pages imported. - */ - if (exporter && exporter->anon_vma && !importer->anon_vma) { - int error; - - importer->anon_vma = exporter->anon_vma; - error = anon_vma_clone(importer, exporter); - if (error) - return error; + VM_WARN_ON(expand != next); + error = dup_anon_vma(next, vma); } + if (error) + return error; } if (vma_iter_prealloc(vmi)) _ Patches currently in -mm which might be from Liam.Howlett@Oracle.com are maple_tree-add-mas_init-function.patch maple_tree-fix-potential-rcu-issue.patch maple_tree-reduce-user-error-potential.patch test_maple_tree-test-modifications-while-iterating.patch mm-expand-vma-iterator-interface.patch mm-mmap-convert-brk-to-use-vma-iterator.patch kernel-fork-convert-forking-to-using-the-vmi-iterator.patch mmap-convert-vma_link-vma-iterator.patch mm-mmap-remove-preallocation-from-do_mas_align_munmap.patch mmap-change-do_mas_munmap-and-do_mas_aligned_munmap-to-use-vma-iterator.patch mmap-convert-vma_expand-to-use-vma-iterator.patch mm-add-temporary-vma-iterator-versions-of-vma_merge-split_vma-and-__split_vma.patch ipc-shm-use-the-vma-iterator-for-munmap-calls.patch userfaultfd-use-vma-iterator.patch mm-change-mprotect_fixup-to-vma-iterator.patch mlock-convert-mlock-to-vma-iterator.patch coredump-convert-to-vma-iterator.patch mempolicy-convert-to-vma-iterator.patch task_mmu-convert-to-vma-iterator.patch sched-convert-to-vma-iterator.patch madvise-use-vmi-iterator-for-__split_vma-and-vma_merge.patch mmap-pass-through-vmi-iterator-to-__split_vma.patch mmap-use-vmi-version-of-vma_merge.patch mm-mremap-use-vmi-version-of-vma_merge.patch nommu-convert-nommu-to-using-the-vma-iterator.patch mm-switch-vma_merge-split_vma-and-__split_vma-to-vma-iterator.patch mmap-convert-__vma_adjust-to-use-vma-iterator.patch mm-pass-through-vma-iterator-to-__vma_adjust.patch madvise-use-split_vma-instead-of-__split_vma.patch mm-remove-unnecessary-write-to-vma-iterator-in-__vma_adjust.patch mm-pass-vma-iterator-through-to-__vma_adjust.patch mm-add-vma-iterator-to-vma_adjust-arguments.patch mmap-clean-up-mmap_region-unrolling.patch mm-change-munmap-splitting-order-and-move_vma.patch mm-mmap-move-anon_vma-setting-in-__vma_adjust.patch mm-mmap-refactor-locking-out-of-__vma_adjust.patch mm-mmap-use-vma_prepare-and-vma_complete-in-vma_expand.patch mm-mmap-introduce-init_vma_prep-and-init_multi_vma_prep.patch mm-dont-use-__vma_adjust-in-__split_vma.patch mm-mmap-dont-use-__vma_adjust-in-shift_arg_pages.patch mm-mmap-introduce-dup_vma_anon-helper.patch mm-mmap-convert-do_brk_flags-to-use-vma_prepare-and-vma_complete.patch mm-mmap-remove-__vma_adjust.patch vma_merge-set-vma-iterator-to-correct-position.patch