* + tools-testing-vma-add-tests-for-copy_vma-self-merge.patch added to mm-unstable branch
@ 2026-08-13 18:54 Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2026-08-13 18:54 UTC (permalink / raw)
To: mm-commits, ljs, akpm
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 8030 bytes --]
The patch titled
Subject: tools/testing/vma: add tests for copy_vma() self-merge
has been added to the -mm mm-unstable branch. Its filename is
tools-testing-vma-add-tests-for-copy_vma-self-merge.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/tools-testing-vma-add-tests-for-copy_vma-self-merge.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 various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Subject: tools/testing/vma: add tests for copy_vma() self-merge
Date: Thu, 13 Aug 2026 18:32:25 +0100
Assert that a VMA can be moved backwards, forwards and between a preceding
VMA and its old self.
In the cases in which the VMA merges only with itself expect that to be
achieved by expanding its old self, so assert that these function
correctly.
However in the case of a merge between a preceding VMA and itself the
original VMA is removed, so assert that the preceding VMA replaces the one
passed in as vmap and the merge is as expected.
Link: https://lore.kernel.org/20260813-b4-scalable-cow-virt-pgoff-v5-8-c21581c0c3c8@kernel.org
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Deucher <alexander.deucher@amd.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Chris Li <chrisl@kernel.org>
Cc: Christan König <christian.koenig@amd.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Gregory Price (Meta) <gourry@gourry.net>
Cc: Harry Yoo <harry@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huang Ray <Ray.Huang@amd.com>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Namhyung kim <namhyung@kernel.org>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Steven Price <steven.price@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Thomas Zimemrmann <tzimmermann@suse.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: xu xin <xu.xin16@zte.com.cn>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
tools/testing/vma/tests/vma.c | 46 +++++++++++++++++++++++++++++++-
1 file changed, 45 insertions(+), 1 deletion(-)
--- a/tools/testing/vma/tests/vma.c~tools-testing-vma-add-tests-for-copy_vma-self-merge
+++ a/tools/testing/vma/tests/vma.c
@@ -33,7 +33,51 @@ static bool test_copy_vma(void)
struct mm_struct mm = {};
bool need_locks = false;
VMA_ITERATOR(vmi, &mm, 0);
- struct vm_area_struct *vma, *vma_new, *vma_next;
+ struct vm_area_struct *vma, *vma_prev, *vma_new, *vma_next, *vma_orig;
+
+ /* Move forwards, adjacent to old self - self-merge. */
+
+ vma = alloc_and_link_vma(&mm, 0x1000, 0x2000, 1, vma_flags);
+ vma_set_anonymous(vma);
+ vma_orig = vma;
+ vma_new = copy_vma(&vma, 0x2000, 0x1000, 1, &need_locks);
+ ASSERT_EQ(vma_new, vma_orig);
+ ASSERT_EQ(vma, vma_orig);
+ ASSERT_EQ(vma_new->vm_start, 0x1000);
+ ASSERT_EQ(vma_new->vm_end, 0x3000);
+
+ cleanup_mm(&mm, &vmi);
+
+ /* Move backwards, adjacent to old self - self-merge. */
+
+ vma = alloc_and_link_vma(&mm, 0x2000, 0x3000, 2, vma_flags);
+ vma_set_anonymous(vma);
+ vma_orig = vma;
+ vma_new = copy_vma(&vma, 0x1000, 0x1000, 2, &need_locks);
+ ASSERT_EQ(vma_new, vma_orig);
+ ASSERT_EQ(vma, vma_orig);
+ ASSERT_EQ(vma_new->vm_start, 0x1000);
+ ASSERT_EQ(vma_new->vm_end, 0x3000);
+
+ cleanup_mm(&mm, &vmi);
+
+ /*
+ * Move backwards between prior VMA and old self - self-merge and vma
+ * updated to a new VMA.
+ */
+
+ vma_prev = alloc_and_link_vma(&mm, 0x1000, 0x2000, 1, vma_flags);
+ vma_set_anonymous(vma_prev);
+ vma = alloc_and_link_vma(&mm, 0x3000, 0x4000, 3, vma_flags);
+ vma_set_anonymous(vma);
+ vma_orig = vma;
+ vma_new = copy_vma(&vma, 0x2000, 0x1000, 3, &need_locks);
+ ASSERT_NE(vma_new, vma_orig);
+ ASSERT_EQ(vma_new, vma);
+ ASSERT_EQ(vma_new->vm_start, 0x1000);
+ ASSERT_EQ(vma_new->vm_end, 0x4000);
+
+ cleanup_mm(&mm, &vmi);
/* Move backwards and do not merge. */
_
Patches currently in -mm which might be from ljs@kernel.org are
mm-vma-introduce-vma-anon-page-offset-field-and-add-helpers.patch
mm-provide-vma_is_cow_mapping-and-remove-is_cow_mapping.patch
mm-introduce-linear_anon_page_index.patch
mm-abstract-vma_address-and-introduce-vma_anon_address.patch
mm-update-print_bad_page_map-to-show-anon-index-if-appropriate.patch
mm-introduce-and-use-vma_filebacked_address.patch
mm-vma-fix-self-merge-check-in-copy_vma.patch
tools-testing-vma-add-tests-for-copy_vma-self-merge.patch
mm-propagate-vma-anonymous-page-offset-on-map-remap-split-merge.patch
mm-rmap-track-whether-the-page-vma-mapped-pgoff-is-anonymous.patch
mm-clean-up-vma_address_end.patch
mm-huge_memory-update-remove_migration_pmd-to-accept-a-folio.patch
mm-migrate-calculate-large-folio-page-index-using-pfn.patch
mm-rmap-use-anon-pgoff-to-track-map_private-file-backed-anon-folios.patch
tools-testing-vma-expand-vma-merge-tests-to-assert-anon-pgoff.patch
tools-testing-selftests-mm-test-anonymous-page-offset-merge-behaviour.patch
mm-add-some-missing-includes-to-mm-local-headers.patch
maintainers-add-drivers-char-memc-to-mm-misc-memory-mapping-sections.patch
^ permalink raw reply [flat|nested] 2+ messages in thread* + tools-testing-vma-add-tests-for-copy_vma-self-merge.patch added to mm-unstable branch
@ 2026-08-06 23:28 Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2026-08-06 23:28 UTC (permalink / raw)
To: mm-commits, ljs, akpm
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 9409 bytes --]
The patch titled
Subject: tools/testing/vma: add tests for copy_vma() self-merge
has been added to the -mm mm-unstable branch. Its filename is
tools-testing-vma-add-tests-for-copy_vma-self-merge.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/tools-testing-vma-add-tests-for-copy_vma-self-merge.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 various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Subject: tools/testing/vma: add tests for copy_vma() self-merge
Date: Thu, 06 Aug 2026 21:21:33 +0100
Assert that a VMA can be moved backwards, forwards and between a preceding
VMA and its old self.
In the cases in which the VMA merges only with itself expect that to be
achieved by expanding its old self, so assert that these function
correctly.
However in the case of a merge between a preceding VMA and itself the
original VMA is removed, so assert that the preceding VMA replaces the one
passed in as vmap and the merge is as expected.
Link: https://lore.kernel.org/20260806-b4-scalable-cow-virt-pgoff-v4-8-ab318a350404@kernel.org
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Deucher <alexander.deucher@amd.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Chris Li <chrisl@kernel.org>
Cc: Christan König <christian.koenig@amd.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Dave Airlie <airlied@gmail.com>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Gregory Price (Meta) <gourry@gourry.net>
Cc: Harry Yoo <harry@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huang Ray <Ray.Huang@amd.com>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Namhyung kim <namhyung@kernel.org>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Steven Price <steven.price@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: <syzbot@syzkaller.appspotmail.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Thomas Zimemrmann <tzimmermann@suse.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Xu Xin <xu.xin16@zte.com.cn>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
tools/testing/vma/tests/vma.c | 46 +++++++++++++++++++++++++++++++-
1 file changed, 45 insertions(+), 1 deletion(-)
--- a/tools/testing/vma/tests/vma.c~tools-testing-vma-add-tests-for-copy_vma-self-merge
+++ a/tools/testing/vma/tests/vma.c
@@ -33,7 +33,51 @@ static bool test_copy_vma(void)
struct mm_struct mm = {};
bool need_locks = false;
VMA_ITERATOR(vmi, &mm, 0);
- struct vm_area_struct *vma, *vma_new, *vma_next;
+ struct vm_area_struct *vma, *vma_prev, *vma_new, *vma_next, *vma_orig;
+
+ /* Move forwards, adjacent to old self - self-merge. */
+
+ vma = alloc_and_link_vma(&mm, 0x1000, 0x2000, 1, vma_flags);
+ vma_set_anonymous(vma);
+ vma_orig = vma;
+ vma_new = copy_vma(&vma, 0x2000, 0x1000, 1, &need_locks);
+ ASSERT_EQ(vma_new, vma_orig);
+ ASSERT_EQ(vma, vma_orig);
+ ASSERT_EQ(vma_new->vm_start, 0x1000);
+ ASSERT_EQ(vma_new->vm_end, 0x3000);
+
+ cleanup_mm(&mm, &vmi);
+
+ /* Move backwards, adjacent to old self - self-merge. */
+
+ vma = alloc_and_link_vma(&mm, 0x2000, 0x3000, 2, vma_flags);
+ vma_set_anonymous(vma);
+ vma_orig = vma;
+ vma_new = copy_vma(&vma, 0x1000, 0x1000, 2, &need_locks);
+ ASSERT_EQ(vma_new, vma_orig);
+ ASSERT_EQ(vma, vma_orig);
+ ASSERT_EQ(vma_new->vm_start, 0x1000);
+ ASSERT_EQ(vma_new->vm_end, 0x3000);
+
+ cleanup_mm(&mm, &vmi);
+
+ /*
+ * Move backwards between prior VMA and old self - self-merge and vma
+ * updated to a new VMA.
+ */
+
+ vma_prev = alloc_and_link_vma(&mm, 0x1000, 0x2000, 1, vma_flags);
+ vma_set_anonymous(vma_prev);
+ vma = alloc_and_link_vma(&mm, 0x3000, 0x4000, 3, vma_flags);
+ vma_set_anonymous(vma);
+ vma_orig = vma;
+ vma_new = copy_vma(&vma, 0x2000, 0x1000, 3, &need_locks);
+ ASSERT_NE(vma_new, vma_orig);
+ ASSERT_EQ(vma_new, vma);
+ ASSERT_EQ(vma_new->vm_start, 0x1000);
+ ASSERT_EQ(vma_new->vm_end, 0x4000);
+
+ cleanup_mm(&mm, &vmi);
/* Move backwards and do not merge. */
_
Patches currently in -mm which might be from ljs@kernel.org are
x86-mm-pat-acquire-init_mm-write-lock-on-collapse-to-avoid-uaf.patch
x86-mm-pat-acquire-init_mm-read-lock-on-attribute-change-to-avoid-uaf.patch
x86-mm-pat-allocate-split-page-tables-as-kernel-page-tables.patch
mm-introduce-vma_flags_can_grow-and-vma_can_grow.patch
mm-vma-update-do_mmap-to-use-vma_flags_t.patch
mm-convert-__get_unmapped_area-to-use-vma_flags_t.patch
mm-update-generic_get_unmapped_area-to-use-vma_flags_t.patch
mm-prefer-mm-def_vma_flags-in-mm-logic.patch
mm-vma-convert-vm_pgprot_modify-to-use-vma_flags_t-and-rename.patch
mm-vma-rename-vma_get_page_prot-to-vma_flags_to_page_prot.patch
mm-introduce-vma_get_page_prot-and-use-it.patch
mm-vma-update-create_init_stack_vma-to-use-vma_flags_t.patch
mm-vma-convert-miscellaneous-uses-of-vma-flags-in-core-mm.patch
mm-mlock-convert-mlock-code-to-use-vma_flags_t.patch
mm-mprotect-convert-mprotect-code-to-use-vma_flags_t.patch
mm-mremap-convert-mremap-code-to-use-vma_flags_t.patch
mm-mseal-remove-superfluous-comments-fix-confusion-around-mm.patch
mm-mseal-limit-scope-of-mseal-address-zero-to-address-zero.patch
mm-mseal-remove-further-superfluous-comments-do_mseal.patch
mm-vma-introduce-vma-anon-page-offset-field-and-add-helpers.patch
mm-provide-vma_is_cow_mapping-and-remove-is_cow_mapping.patch
mm-introduce-linear_anon_page_index.patch
mm-abstract-vma_address-and-introduce-vma_anon_address.patch
mm-update-print_bad_page_map-to-show-anon-index-if-appropriate.patch
mm-introduce-and-use-vma_filebacked_address.patch
mm-vma-fix-self-merge-check-in-copy_vma.patch
tools-testing-vma-add-tests-for-copy_vma-self-merge.patch
mm-propagate-vma-anonymous-page-offset-on-map-remap-split-merge.patch
mm-rmap-track-whether-the-page-vma-mapped-pgoff-is-anonymous.patch
mm-clean-up-vma_address_end.patch
mm-huge_memory-update-remove_migration_pmd-to-accept-a-folio.patch
mm-migrate-calculate-large-folio-page-index-using-pfn.patch
mm-rmap-use-anon-pgoff-to-track-map_private-file-backed-anon-folios.patch
tools-testing-vma-expand-vma-merge-tests-to-assert-anon-pgoff.patch
tools-testing-selftests-mm-test-anonymous-page-offset-merge-behaviour.patch
mm-vma-only-permit-map_private-dev-zero-to-be-mapped-anonymous.patch
mm-vma-make-map_private-mapped-dev-zero-mappings-truly-anonymous.patch
tools-testing-vma-add-test-to-assert-map_private-dev-zero-is-anon.patch
tools-testing-selftests-mm-add-map_private-dev-zero-merge-tests.patch
mm-add-some-missing-includes-to-mm-local-headers.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
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