[merged mm-stable] mm-vma-refactor-vmg_adjust_set_range-for-clarity.patch removed from -mm tree

[merged mm-stable] mm-vma-refactor-vmg_adjust_set_range-for-clarity.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/vma: refactor vmg_adjust_set_range() for clarity
has been removed from the -mm tree.  Its filename was
     mm-vma-refactor-vmg_adjust_set_range-for-clarity.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Lorenzo Stoakes <ljs@kernel.org>
Subject: mm/vma: refactor vmg_adjust_set_range() for clarity
Date: Fri, 10 Jul 2026 21:16:56 +0100

Add comments with ASCII diagrams to describe what we're doing, avoid
dubious use of PHYS_PFN(), and use vma_start_pgoff().

The most complicated scenario represented here is vmg->__adjust_next_start
- when this is set, vmg->[start, end] actually indicate the range to be
retained, so take special care to describe this accurately.

No functional change intended.

Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-15-2a5aa403d977@kernel.org
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Ackerley Tng <ackerleytng@google.com>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Kai Huang <kai.huang@intel.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: SJ Park <sj@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Liam R. Howlett (Oracle) <liam@infradead.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vma.c |   51 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 47 insertions(+), 4 deletions(-)

--- a/mm/vma.c~mm-vma-refactor-vmg_adjust_set_range-for-clarity
+++ a/mm/vma.c
@@ -704,11 +704,54 @@ static void vmg_adjust_set_range(struct
 	pgoff_t pgoff;
 
 	if (vmg->__adjust_middle_start) {
-		adjust = vmg->middle;
-		pgoff = adjust->vm_pgoff + PHYS_PFN(vmg->end - adjust->vm_start);
+		/*
+		 * vmg->start    vmg->end
+		 * |             |
+		 * v    merge    v
+		 * <------------->
+		 *         delta
+		 *        <------>
+		 * |------|----------------|
+		 * | prev |    middle      |
+		 * |------|----------------|
+		 *        ^
+		 *        |
+		 *        middle->vm_start
+		 */
+		struct vm_area_struct *middle = vmg->middle;
+		const unsigned long delta = vmg->end - middle->vm_start;
+
+		pgoff = vma_start_pgoff(middle) + (delta >> PAGE_SHIFT);
+		adjust = middle;
 	} else if (vmg->__adjust_next_start) {
-		adjust = vmg->next;
-		pgoff = adjust->vm_pgoff - PHYS_PFN(adjust->vm_start - vmg->end);
+		/*
+		 *                Originally:
+		 *
+		 *            vmg->start   vmg->end
+		 *            |            |
+		 *            v    merge   v
+		 *            <------------>
+		 *            .            .
+		 * merge_existing_range() updates to:
+		 *            .            .
+		 * vmg->start vmg->end     .
+		 * |          |            .
+		 * v  retain  v            .
+		 * <---------->            .
+		 *             delta       .
+		 *            <----->      .
+		 * |----------------|------|
+		 * |    middle      | next |
+		 * |----------------|------|
+		 *                  ^
+		 *                  |
+		 *                  next->vm_start
+		 */
+		struct vm_area_struct *next = vmg->next;
+		const unsigned long delta = next->vm_start - vmg->end;
+
+		pgoff = vma_start_pgoff(next) - (delta >> PAGE_SHIFT);
+		adjust = next;
 	} else {
 		return;
 	}
_

Patches currently in -mm which might be from ljs@kernel.org are

mm-vmalloc-acquire-init_mm-lock-on-huge-vmap-to-avoid-ptdump-uaf.patch
mm-ptdump-always-stabilise-against-page-table-freeing-using-init_mm.patch
arm64-remove-redundant-concurrent-ptdump-uaf-mitigation.patch
mm-huge_memory-fix-huge_zero_pfn-race.patch
mm-huge_memory-separate-out-config_persistent_huge_zero_folio-logic.patch
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-virtual-page-offset-field-and-add-helpers.patch
mm-introduce-linear_virt_page_index.patch
mm-abstract-vma_address-and-introduce-vma_anon_address.patch
mm-update-print_bad_page_map-to-show-virtual-page-index.patch
mm-introduce-and-use-vma_filebacked_address.patch
mm-propagate-vma-virtual-page-offset-on-map-remap-split-merge.patch
mm-rmap-track-whether-the-page-vma-mapped-walk-is-anonymous.patch
mm-introduce-and-use-linear_folio_page_index.patch
mm-rmap-use-virt-pgoff-for-map_private-file-backed-anon-folios.patch
tools-testing-vma-expand-vma-merge-tests-to-assert-virt-pgoff.patch
tools-testing-selftests-mm-test-virtual-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