mm/ptdump: replace READ_ONCE() with standard page table accessors

Replace READ_ONCE() with standard page table accessors i.e pxdp_get()
which anyways default into READ_ONCE() in cases where platform does not
override.  Also convert ptep_get_lockless() into ptep_get() as well.

Link: https://lkml.kernel.org/r/20251001042502.1400726-1-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Acked-by: Lance Yang <lance.yang@linux.dev>
Acked-by: SeongJae Park <sj@kernel.org>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/ptdump.c b/mm/ptdump.c
index b600c7f864b8b420f25aa3b52787db3df22e9422..973020000096cf3efd27749befbf8dd48bf0151b 100644 (file)
--- a/mm/ptdump.c
+++ b/mm/ptdump.c
@@ -31,7 +31,7 @@ static int ptdump_pgd_entry(pgd_t *pgd, unsigned long addr,
                            unsigned long next, struct mm_walk *walk)
 {
        struct ptdump_state *st = walk->private;
-       pgd_t val = READ_ONCE(*pgd);
+       pgd_t val = pgdp_get(pgd);
 
 #if CONFIG_PGTABLE_LEVELS > 4 && \
                (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
@@ -54,7 +54,7 @@ static int ptdump_p4d_entry(p4d_t *p4d, unsigned long addr,
                            unsigned long next, struct mm_walk *walk)
 {
        struct ptdump_state *st = walk->private;
-       p4d_t val = READ_ONCE(*p4d);
+       p4d_t val = p4dp_get(p4d);
 
 #if CONFIG_PGTABLE_LEVELS > 3 && \
                (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
@@ -77,7 +77,7 @@ static int ptdump_pud_entry(pud_t *pud, unsigned long addr,
                            unsigned long next, struct mm_walk *walk)
 {
        struct ptdump_state *st = walk->private;
-       pud_t val = READ_ONCE(*pud);
+       pud_t val = pudp_get(pud);
 
 #if CONFIG_PGTABLE_LEVELS > 2 && \
                (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
@@ -100,7 +100,7 @@ static int ptdump_pmd_entry(pmd_t *pmd, unsigned long addr,
                            unsigned long next, struct mm_walk *walk)
 {
        struct ptdump_state *st = walk->private;
-       pmd_t val = READ_ONCE(*pmd);
+       pmd_t val = pmdp_get(pmd);
 
 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
        if (pmd_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pte)))
@@ -121,7 +121,7 @@ static int ptdump_pte_entry(pte_t *pte, unsigned long addr,
                            unsigned long next, struct mm_walk *walk)
 {
        struct ptdump_state *st = walk->private;
-       pte_t val = ptep_get_lockless(pte);
+       pte_t val = ptep_get(pte);
 
        if (st->effective_prot_pte)
                st->effective_prot_pte(st, val);