[merged mm-stable] mm-vma-use-guard-clauses-in-can_vma_merge_.patch removed from -mm tree

The quilt patch titled
     Subject: mm/vma: use guard clauses in can_vma_merge_[before, after]()
has been removed from the -mm tree.  Its filename was
     mm-vma-use-guard-clauses-in-can_vma_merge_.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 <[email protected]>
Subject: mm/vma: use guard clauses in can_vma_merge_[before, after]()
Date: Fri, 10 Jul 2026 21:17:12 +0100

Rather than combining a bunch of conditionals in a single expression,
simplify by inverting the mergeability requirements into guard clauses.

that is - instead of checking what must be true for the conditions to be
met, instead check the inverse of the requirements and return false if any
are true, defaulting to true.

No functional change intended.

Link: https://lore.kernel.org/[email protected]
Signed-off-by: Lorenzo Stoakes <[email protected]>
Reviewed-by: Pedro Falcato <[email protected]>
Reviewed-by: Gregory Price <[email protected]>
Reviewed-by: Vlastimil Babka (SUSE) <[email protected]>
Cc: Ackerley Tng <[email protected]>
Cc: David Hildenbrand (Arm) <[email protected]>
Cc: Kai Huang <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Cc: SJ Park <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Liam R. Howlett (Oracle) <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---

 mm/vma.c |   27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

--- a/mm/vma.c~mm-vma-use-guard-clauses-in-can_vma_merge_
+++ a/mm/vma.c
@@ -215,13 +215,13 @@ static void init_multi_vma_prep(struct v
  */
 static bool can_vma_merge_before(struct vma_merge_struct *vmg)
 {
-	if (is_mergeable_vma(vmg, /* merge_next = */ true) &&
-	    is_mergeable_anon_vma(vmg, /* merge_next = */ true)) {
-		if (vmg_end_pgoff(vmg) == vma_start_pgoff(vmg->next))
-			return true;
-	}
-
-	return false;
+	if (!is_mergeable_vma(vmg, /* merge_next = */ true))
+		return false;
+	if (!is_mergeable_anon_vma(vmg, /* merge_next = */ true))
+		return false;
+	if (vmg_end_pgoff(vmg) != vma_start_pgoff(vmg->next))
+		return false;
+	return true;
 }
 
 /*
@@ -235,12 +235,13 @@ static bool can_vma_merge_before(struct
  */
 static bool can_vma_merge_after(struct vma_merge_struct *vmg)
 {
-	if (is_mergeable_vma(vmg, /* merge_next = */ false) &&
-	    is_mergeable_anon_vma(vmg, /* merge_next = */ false)) {
-		if (vma_end_pgoff(vmg->prev) == vmg_start_pgoff(vmg))
-			return true;
-	}
-	return false;
+	if (!is_mergeable_vma(vmg, /* merge_next = */ false))
+		return false;
+	if (!is_mergeable_anon_vma(vmg, /* merge_next = */ false))
+		return false;
+	if (vma_end_pgoff(vmg->prev) != vmg_start_pgoff(vmg))
+		return false;
+	return true;
 }
 
 static void __vma_link_file(struct vm_area_struct *vma,
_

Patches currently in -mm which might be from [email protected] 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