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userfaultfd: test uffd VMA flags through the vma_flags_t API

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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@infradead.org>
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>
This commit is contained in:
Kiryl Shutsemau (Meta)
2026-07-08 12:14:05 +01:00
committed by Andrew Morton
parent c0ffe79eed
commit 2730ee209f
1 changed files with 8 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
include/linux/userfaultfd_k.h
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@@ -178,7 +178,8 @@ static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma,
*/
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_share(struct vm_area_struct *vma)
*/
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_wp(struct vm_area_struct *vma,
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)