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Message-Id: <20251007063100.2396936-1-anshuman.khandual@arm.com>
Date: Tue, 7 Oct 2025 07:31:00 +0100
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
David Hildenbrand <david@...hat.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH] mm: Replace READ_ONCE() with standard page table accessors
Replace all READ_ONCE() with a standard page table accessors i.e pxdp_get()
that defaults into READ_ONCE() in cases where platform does not override.
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
mm/gup.c | 10 +++++-----
mm/hmm.c | 2 +-
mm/memory.c | 4 ++--
mm/mprotect.c | 2 +-
mm/sparse-vmemmap.c | 2 +-
mm/vmscan.c | 2 +-
6 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/mm/gup.c b/mm/gup.c
index 0bc4d140fc07..37e2af5ed96d 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -964,7 +964,7 @@ static struct page *follow_pud_mask(struct vm_area_struct *vma,
struct mm_struct *mm = vma->vm_mm;
pudp = pud_offset(p4dp, address);
- pud = READ_ONCE(*pudp);
+ pud = pudp_get(pudp);
if (!pud_present(pud))
return no_page_table(vma, flags, address);
if (pud_leaf(pud)) {
@@ -989,7 +989,7 @@ static struct page *follow_p4d_mask(struct vm_area_struct *vma,
p4d_t *p4dp, p4d;
p4dp = p4d_offset(pgdp, address);
- p4d = READ_ONCE(*p4dp);
+ p4d = p4dp_get(p4dp);
BUILD_BUG_ON(p4d_leaf(p4d));
if (!p4d_present(p4d) || p4d_bad(p4d))
@@ -3080,7 +3080,7 @@ static int gup_fast_pud_range(p4d_t *p4dp, p4d_t p4d, unsigned long addr,
pudp = pud_offset_lockless(p4dp, p4d, addr);
do {
- pud_t pud = READ_ONCE(*pudp);
+ pud_t pud = pudp_get(pudp);
next = pud_addr_end(addr, end);
if (unlikely(!pud_present(pud)))
@@ -3106,7 +3106,7 @@ static int gup_fast_p4d_range(pgd_t *pgdp, pgd_t pgd, unsigned long addr,
p4dp = p4d_offset_lockless(pgdp, pgd, addr);
do {
- p4d_t p4d = READ_ONCE(*p4dp);
+ p4d_t p4d = p4dp_get(p4dp);
next = p4d_addr_end(addr, end);
if (!p4d_present(p4d))
@@ -3128,7 +3128,7 @@ static void gup_fast_pgd_range(unsigned long addr, unsigned long end,
pgdp = pgd_offset(current->mm, addr);
do {
- pgd_t pgd = READ_ONCE(*pgdp);
+ pgd_t pgd = pgdp_get(pgdp);
next = pgd_addr_end(addr, end);
if (pgd_none(pgd))
diff --git a/mm/hmm.c b/mm/hmm.c
index d545e2494994..126c3f42e525 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -431,7 +431,7 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
/* Normally we don't want to split the huge page */
walk->action = ACTION_CONTINUE;
- pud = READ_ONCE(*pudp);
+ pud = pudp_get(pudp);
if (!pud_present(pud)) {
spin_unlock(ptl);
return hmm_vma_walk_hole(start, end, -1, walk);
diff --git a/mm/memory.c b/mm/memory.c
index 0ba4f6b71847..50f841ee6e84 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -6549,12 +6549,12 @@ int follow_pfnmap_start(struct follow_pfnmap_args *args)
goto out;
p4dp = p4d_offset(pgdp, address);
- p4d = READ_ONCE(*p4dp);
+ p4d = p4dp_get(p4dp);
if (p4d_none(p4d) || unlikely(p4d_bad(p4d)))
goto out;
pudp = pud_offset(p4dp, address);
- pud = READ_ONCE(*pudp);
+ pud = pudp_get(pudp);
if (pud_none(pud))
goto out;
if (pud_leaf(pud)) {
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 113b48985834..988c366137d5 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -599,7 +599,7 @@ static inline long change_pud_range(struct mmu_gather *tlb,
break;
}
- pud = READ_ONCE(*pudp);
+ pud = pudp_get(pudp);
if (pud_none(pud))
continue;
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index dbd8daccade2..37522d6cb398 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -439,7 +439,7 @@ int __meminit vmemmap_populate_hugepages(unsigned long start, unsigned long end,
return -ENOMEM;
pmd = pmd_offset(pud, addr);
- if (pmd_none(READ_ONCE(*pmd))) {
+ if (pmd_none(pmdp_get(pmd))) {
void *p;
p = vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 674999999cd0..14c2722b955b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3772,7 +3772,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long start, unsigned long end,
pud = pud_offset(p4d, start & P4D_MASK);
restart:
for (i = pud_index(start), addr = start; addr != end; i++, addr = next) {
- pud_t val = READ_ONCE(pud[i]);
+ pud_t val = pudp_get(pud + i);
next = pud_addr_end(addr, end);
--
2.30.2
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