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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.

Link: https://lkml.kernel.org/r/20251007063100.2396936-1-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Anshuman Khandual 2025-10-07 07:31:00 +01:00 committed by Andrew Morton
parent bda7bf0684
commit c0efdb373c
6 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
mm/gup.c
View File

@ -950,7 +950,7 @@ 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)) {
@ -975,7 +975,7 @@ 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))
@ -3060,7 +3060,7 @@ 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)))
@ -3086,7 +3086,7 @@ 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))
@ -3108,7 +3108,7 @@ 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))

2
mm/hmm.c
View File

@ -491,7 +491,7 @@ 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);

4
mm/memory.c
View File

@ -6690,12 +6690,12 @@ 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)) {

2
mm/mprotect.c
View File

@ -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;

2
mm/sparse-vmemmap.c
View File

@ -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);

2
mm/vmscan.c
View File

@ -3773,7 +3773,7 @@ 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);