# \[PATCH 05/13\] mm: convert THP VMA flag tests to use vma\_flags\_t - From: Lorenzo Stoakes (ARM) \ - Date: 2026-11-05 21:33:06 - List: linux-trace-kernel - Page: https://ratatoskr.run/linux-trace-kernel/2026/11/17874196 - Thread: https://ratatoskr.run/linux-mm/2026/11/17874173/t.md ```text Replace use of the legacy vm_flags_t flags with vma_flags_t values where VMA flags are tested directly in the THP and khugepaged logic. The thp_vma_allowable_orders() family of functions, hugepage_madvise() and khugepaged_enter_vma() continue to take legacy flags for the time being. Also update BUG_ON()'s to VM_WARN_ON_ONCE() while here. No functional change intended. Signed-off-by: Lorenzo Stoakes (ARM) --- mm/huge_memory.c | 32 ++++++++++++++++---------------- mm/khugepaged.c | 8 +++++--- 2 files changed, 21 insertions(+), 19 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 7e589a2fb02d..764e693b422f 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1257,7 +1257,7 @@ __setup("thp_anon=", setup_thp_anon); pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma) { - if (likely(vma->vm_flags & VM_WRITE)) + if (likely(vma_test(vma, VMA_WRITE_BIT))) pmd = pmd_mkwrite(pmd, vma); return pmd; } @@ -1517,7 +1517,7 @@ vm_fault_t do_huge_pmd_device_private(struct vm_fault *vmf) */ gfp_t vma_thp_gfp_mask(struct vm_area_struct *vma) { - const bool vma_madvised = vma && (vma->vm_flags & VM_HUGEPAGE); + const bool vma_madvised = vma && vma_test(vma, VMA_HUGEPAGE_BIT); /* Always do synchronous compaction */ if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags)) @@ -1716,10 +1716,9 @@ vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, unsigned long pfn, * but we need to be consistent with PTEs and architectures that * can't support a 'special' bit. */ - BUG_ON(!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))); - BUG_ON((vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) == - (VM_PFNMAP|VM_MIXEDMAP)); - BUG_ON((vma->vm_flags & VM_PFNMAP) && vma_is_cow_mapping(vma)); + VM_WARN_ON_ONCE(!vma_test_any(vma, VMA_PFNMAP_BIT, VMA_MIXEDMAP_BIT)); + VM_WARN_ON_ONCE(vma_test_all(vma, VMA_PFNMAP_BIT, VMA_MIXEDMAP_BIT)); + VM_WARN_ON_ONCE(vma_test(vma, VMA_PFNMAP_BIT) && vma_is_cow_mapping(vma)); if (unlikely(is_huge_zero_pfn(pfn))) return VM_FAULT_SIGBUS; @@ -1750,7 +1749,7 @@ EXPORT_SYMBOL_GPL(vmf_insert_folio_pmd); #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD static pud_t maybe_pud_mkwrite(pud_t pud, struct vm_area_struct *vma) { - if (likely(vma->vm_flags & VM_WRITE)) + if (likely(vma_test(vma, VMA_WRITE_BIT))) pud = pud_mkwrite(pud); return pud; } @@ -1827,10 +1826,9 @@ vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, unsigned long pfn, * but we need to be consistent with PTEs and architectures that * can't support a 'special' bit. */ - BUG_ON(!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))); - BUG_ON((vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) == - (VM_PFNMAP|VM_MIXEDMAP)); - BUG_ON((vma->vm_flags & VM_PFNMAP) && vma_is_cow_mapping(vma)); + VM_WARN_ON_ONCE(!vma_test_any(vma, VMA_PFNMAP_BIT, VMA_MIXEDMAP_BIT)); + VM_WARN_ON_ONCE(vma_test_all(vma, VMA_PFNMAP_BIT, VMA_MIXEDMAP_BIT)); + VM_WARN_ON_ONCE(vma_test(vma, VMA_PFNMAP_BIT) && vma_is_cow_mapping(vma)); pfnmap_setup_cachemode_pfn(pfn, &pgprot); @@ -2262,7 +2260,7 @@ static inline bool can_change_pmd_writable(struct vm_area_struct *vma, { struct page *page; - if (WARN_ON_ONCE(!(vma->vm_flags & VM_WRITE))) + if (WARN_ON_ONCE(!vma_test(vma, VMA_WRITE_BIT))) return false; /* Don't touch entries that are not even readable (NUMA hinting). */ @@ -2277,7 +2275,7 @@ static inline bool can_change_pmd_writable(struct vm_area_struct *vma, if (userfaultfd_huge_pmd_wp(vma, pmd)) return false; - if (!(vma->vm_flags & VM_SHARED)) { + if (!vma_test(vma, VMA_SHARED_BIT)) { /* See can_change_pte_writable(). */ page = vm_normal_page_pmd(vma, addr, pmd); return page && PageAnon(page) && PageAnonExclusive(page); @@ -3568,7 +3566,8 @@ static bool __discard_anon_folio_pmd_locked(struct vm_area_struct *vma, if (pmd_dirty(orig_pmd)) folio_set_dirty(folio); - if (folio_test_dirty(folio) && !(vma->vm_flags & VM_DROPPABLE)) { + if (folio_test_dirty(folio) && + !vma_test_single_mask(vma, VMA_DROPPABLE)) { folio_set_swapbacked(folio); return false; } @@ -3600,7 +3599,8 @@ static bool __discard_anon_folio_pmd_locked(struct vm_area_struct *vma, */ if (pmd_dirty(orig_pmd)) folio_set_dirty(folio); - if (folio_test_dirty(folio) && !(vma->vm_flags & VM_DROPPABLE)) { + if (folio_test_dirty(folio) && + !vma_test_single_mask(vma, VMA_DROPPABLE)) { folio_set_swapbacked(folio); set_pmd_at(mm, addr, pmdp, orig_pmd); return false; @@ -3614,7 +3614,7 @@ static bool __discard_anon_folio_pmd_locked(struct vm_area_struct *vma, folio_remove_rmap_pmd(folio, pmd_page(orig_pmd), vma); zap_deposited_table(mm, pmdp); add_mm_counter(mm, MM_ANONPAGES, -HPAGE_PMD_NR); - if (vma->vm_flags & VM_LOCKED) + if (vma_test(vma, VMA_LOCKED_BIT)) mlock_drain_local(); folio_put(folio); diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 0d3bd9e23613..a2c7c6a0768d 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -640,7 +640,8 @@ static enum scan_result __collapse_huge_page_isolate(struct vm_area_struct *vma, * If the vma has the VM_DROPPABLE flag, the collapse will * preserve the lazyfree property without needing to skip. */ - if (cc->policy.anon_skip_lazyfree && !(vma->vm_flags & VM_DROPPABLE) && + if (cc->policy.anon_skip_lazyfree && + !vma_test_single_mask(vma, VMA_DROPPABLE) && folio_test_lazyfree(folio) && !pte_dirty(pteval)) { result = SCAN_PAGE_LAZYFREE; goto out; @@ -1683,7 +1684,8 @@ static enum scan_result collapse_scan_anon(struct vm_area_struct *vma, * If the vma has the VM_DROPPABLE flag, the collapse will * preserve the lazyfree property without needing to skip. */ - if (cc->policy.anon_skip_lazyfree && !(vma->vm_flags & VM_DROPPABLE) && + if (cc->policy.anon_skip_lazyfree && + !vma_test_single_mask(vma, VMA_DROPPABLE) && folio_test_lazyfree(folio) && !pte_dirty(pteval)) { result = SCAN_PAGE_LAZYFREE; failed_pfn = folio_pfn(folio); @@ -1948,7 +1950,7 @@ static enum scan_result try_collapse_pte_mapped_thp(struct mm_struct *mm, unsign * So page lock of folio does not protect from it, so we must not drop * ptl before pgt_pmd is removed, so uffd private needs pml taken now. */ - if (userfaultfd_armed(vma) && !(vma->vm_flags & VM_SHARED)) + if (userfaultfd_armed(vma) && !vma_test(vma, VMA_SHARED_BIT)) pml = pmd_lock(mm, pmd); start_pte = pte_offset_map_rw_nolock(mm, pmd, haddr, &pgt_pmd, &ptl); -- 2.56.0 ```