[PATCH] mm/page_vma_mapped_walk: add missing pgtable entry accessors

Alexander Gordeev
2026-04-27T05:20:15Z

Convert pgtable direct entry dereferences to the corresponding
pXdp_get() accessors. Use ptep_get_lockless() variant for PTE
reads when no lock is taken.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
---
mm/page_vma_mapped.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index b38a1d00c971..a4520bb10d2a 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -41,7 +41,7 @@ static bool map_pte(struct page_vma_mapped_walk *pvmw, pmd_t *pmdvalp,
if (!pvmw->pte)
return false;

- ptent = ptep_get(pvmw->pte);
+ ptent = ptep_get_lockless(pvmw->pte);

if (pte_none(ptent)) {
return false;
@@ -219,17 +219,17 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
restart:
do {
pgd = pgd_offset(mm, pvmw->address);
- if (!pgd_present(*pgd)) {
+ if (!pgd_present(pgdp_get(pgd))) {
step_forward(pvmw, PGDIR_SIZE);
continue;
}
p4d = p4d_offset(pgd, pvmw->address);
- if (!p4d_present(*p4d)) {
+ if (!p4d_present(p4dp_get(p4d))) {
step_forward(pvmw, P4D_SIZE);
continue;
}
pud = pud_offset(p4d, pvmw->address);
- if (!pud_present(*pud)) {
+ if (!pud_present(pudp_get(pud))) {
step_forward(pvmw, PUD_SIZE);
continue;
}
@@ -244,7 +244,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)

if (pmd_trans_huge(pmde) || pmd_is_migration_entry(pmde)) {
pvmw->ptl = pmd_lock(mm, pvmw->pmd);
- pmde = *pvmw->pmd;
+ pmde = pmdp_get(pvmw->pmd);
if (!pmd_present(pmde)) {
softleaf_t entry;

@@ -317,7 +317,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
goto restart;
}
pvmw->pte++;
- } while (pte_none(ptep_get(pvmw->pte)));
+ } while (pte_none(ptep_get_lockless(pvmw->pte)));

if (!pvmw->ptl) {
spin_lock(ptl);
--
2.51.0