[merged mm-stable] mm-page_vma_mapped-use-huge_ptep_get-for-hugetlb.patch removed from -mm tree

The quilt patch titled
     Subject: mm/page_vma_mapped: use huge_ptep_get() for hugetlb
has been removed from the -mm tree.  Its filename was
     mm-page_vma_mapped-use-huge_ptep_get-for-hugetlb.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: Dev Jain <[email protected]>
Subject: mm/page_vma_mapped: use huge_ptep_get() for hugetlb
Date: Fri, 3 Jul 2026 11:41:58 +0000

check_pte() is the final validation step in page_vma_mapped_walk().  It
reads pvmw->pte with ptep_get() to decide whether the entry maps the PFN
range being walked.  For hugetlb VMAs, that pointer refers to a hugetlb
entry.

On arches which provide their own huge_ptep_get() to dereference a huge
pte pointer, accessing via ptep_get() would cause pte_pfn(), pte_present()
etc to misbehave.

It is not clear whether this has a trivially visible effect to userspace.

Use huge_ptep_get() to dereference a huge pte pointer.

Link: https://lore.kernel.org/[email protected]
Fixes: ace71a19cec5 ("mm: introduce page_vma_mapped_walk()")
Signed-off-by: Dev Jain <[email protected]>
Acked-by: David Hildenbrand (Arm) <[email protected]>
Reviewed-by: Muchun Song <[email protected]>
Cc: Alistair Popple <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Byungchul Park <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Gregory Price <[email protected]>
Cc: Harry Yoo <[email protected]>
Cc: "Huang, Ying" <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Joshua Hahn <[email protected]>
Cc: Jun'ichi "Nick" Nomura <[email protected]>
Cc: Kiryl Shutsemau <[email protected]>
Cc: Lance Yang <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Pedro Falcato <[email protected]>
Cc: Rakie Kim <[email protected]>
Cc: Ralph Campbell <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Ryan Roberts <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Zi Yan <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---

 mm/page_vma_mapped.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/mm/page_vma_mapped.c~mm-page_vma_mapped-use-huge_ptep_get-for-hugetlb
+++ a/mm/page_vma_mapped.c
@@ -107,7 +107,13 @@ again:
 static bool check_pte(struct page_vma_mapped_walk *pvmw, unsigned long pte_nr)
 {
 	unsigned long pfn;
-	pte_t ptent = ptep_get(pvmw->pte);
+	pte_t ptent;
+
+	if (is_vm_hugetlb_page(pvmw->vma))
+		ptent = huge_ptep_get(pvmw->vma->vm_mm, pvmw->address,
+				      pvmw->pte);
+	else
+		ptent = ptep_get(pvmw->pte);
 
 	if (pvmw->flags & PVMW_MIGRATION) {
 		const softleaf_t entry = softleaf_from_pte(ptent);
_

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

mm-rmap-convert-page-folio-for-hwpoison-checks.patch
mm-rmap-add-try_to_unmap_poisoned_hugetlb_one.patch
mm-rmap-refactor-some-code-around-lazyfree-folio-unmapping.patch
mm-rmap-refactor-anon-folio-unmap-in-try_to_unmap_one.patch
mm-rmap-add-anon-folio-unmap-dispatcher.patch
mm-memory-move-pte_install_uffd_wp_if_needed-into-memoryc.patch
mm-memory-batch-set-uffd-wp-markers-during-zapping.patch
mm-rmap-batch-unmap-file-folios-belonging-to-uffd-wp-vmas.patch