+ userfaultfd-test-uffd-vma-flags-through-the-vma_flags_t-api.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: userfaultfd: test uffd VMA flags through the vma_flags_t API
has been added to the -mm mm-new branch.  Its filename is
     userfaultfd-test-uffd-vma-flags-through-the-vma_flags_t-api.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/userfaultfd-test-uffd-vma-flags-through-the-vma_flags_t-api.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: "Kiryl Shutsemau (Meta)" <kas@kernel.org>
Subject: userfaultfd: test uffd VMA flags through the vma_flags_t API
Date: Wed, 8 Jul 2026 12:14:05 +0100

The uffd VMA-flag helpers read vma->vm_flags directly.  Now that
config-gated per-mode masks exist, switch them to the vma_flags_t accessor
vma_test_any_mask(), which is the going-forward API and keeps a single
place (the VMA_UFFD_* masks) that knows which modes are available on the
current build.

No functional change: vma_flags_t is in union with vm_flags, so the same
bits are read, and the masks fold to the same code the open-coded vm_flags
tests produced -- verified identical on gcc and clang, 32- and 64-bit.

Link: https://lore.kernel.org/20260708111417.173443-5-kirill@shutemov.name
Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
Suggested-by: Lorenzo Stoakes <ljs@kernel.org>
Assisted-by: Claude:claude-opus-4-8
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: James Houghton <jthoughton@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/userfaultfd_k.h |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/include/linux/userfaultfd_k.h~userfaultfd-test-uffd-vma-flags-through-the-vma_flags_t-api
+++ a/include/linux/userfaultfd_k.h
@@ -178,7 +178,8 @@ static inline bool is_mergeable_vm_userf
  */
 static inline bool uffd_disable_huge_pmd_share(struct vm_area_struct *vma)
 {
-	return vma->vm_flags & (VM_UFFD_WP | VM_UFFD_MINOR);
+	return vma_test_any_mask(vma,
+		mk_vma_flags_from_masks(VMA_UFFD_WP, VMA_UFFD_MINOR));
 }
 
 /*
@@ -190,22 +191,23 @@ static inline bool uffd_disable_huge_pmd
  */
 static inline bool uffd_disable_fault_around(struct vm_area_struct *vma)
 {
-	return vma->vm_flags & (VM_UFFD_WP | VM_UFFD_MINOR);
+	return vma_test_any_mask(vma,
+		mk_vma_flags_from_masks(VMA_UFFD_WP, VMA_UFFD_MINOR));
 }
 
 static inline bool userfaultfd_missing(struct vm_area_struct *vma)
 {
-	return vma->vm_flags & VM_UFFD_MISSING;
+	return vma_test_any_mask(vma, VMA_UFFD_MISSING);
 }
 
 static inline bool userfaultfd_wp(struct vm_area_struct *vma)
 {
-	return vma->vm_flags & VM_UFFD_WP;
+	return vma_test_any_mask(vma, VMA_UFFD_WP);
 }
 
 static inline bool userfaultfd_minor(struct vm_area_struct *vma)
 {
-	return vma->vm_flags & VM_UFFD_MINOR;
+	return vma_test_any_mask(vma, VMA_UFFD_MINOR);
 }
 
 static inline bool userfaultfd_pte_wp(struct vm_area_struct *vma,
@@ -222,7 +224,7 @@ static inline bool userfaultfd_huge_pmd_
 
 static inline bool userfaultfd_armed(struct vm_area_struct *vma)
 {
-	return vma->vm_flags & __VM_UFFD_FLAGS;
+	return vma_test_any_mask(vma, __VMA_UFFD_FLAGS);
 }
 
 static inline bool vma_has_uffd_without_event_remap(struct vm_area_struct *vma)
_

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

mm-hugetlb-fix-swap-entry-corruption-when-clearing-uffd-wp-at-fork.patch
fs-proc-task_mmu-fix-pagemap_scan-written-state-for-unpopulated-ptes.patch
mm-decouple-protnone-helpers-from-config_numa_balancing.patch
mm-rename-uffd-wp-pte-bit-macros-to-uffd.patch
mm-rename-uffd-wp-pte-accessors-to-uffd.patch
userfaultfd-test-uffd-vma-flags-through-the-vma_flags_t-api.patch
mm-add-vm_uffd_rwp-vma-flag.patch
mm-add-mm_cp_uffd_rwp-change_protection-flag.patch
mm-preserve-rwp-marker-across-pte-rewrites.patch
mm-handle-vm_uffd_rwp-in-khugepaged-rmap-and-gup.patch
userfaultfd-add-uffdio_register_mode_rwp-and-uffdio_rwprotect-plumbing.patch
mm-userfaultfd-add-rwp-fault-delivery-and-expose-uffdio_register_mode_rwp.patch
mm-pagemap-add-page_is_accessed-for-rwp-tracking.patch
userfaultfd-add-uffd_feature_rwp_async-for-async-fault-resolution.patch
userfaultfd-add-uffdio_set_mode-for-runtime-sync-async-toggle.patch
selftests-mm-add-userfaultfd-rwp-tests.patch
documentation-userfaultfd-document-rwp-working-set-tracking.patch