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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>
This commit is contained in:
Anshuman Khandual 2025-10-01 05:25:02 +01:00 committed by Andrew Morton
parent b6c46600bf
commit 11119b19f6
1 changed files with 5 additions and 5 deletions
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10
mm/ptdump.c
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@ -31,7 +31,7 @@ static int ptdump_pgd_entry(pgd_t *pgd, unsigned long addr,
unsigned long next, struct mm_walk *walk) unsigned long next, struct mm_walk *walk)
{ {
struct ptdump_state *st = walk->private; struct ptdump_state *st = walk->private;
pgd_t val = READ_ONCE(*pgd); pgd_t val = pgdp_get(pgd);
#if CONFIG_PGTABLE_LEVELS > 4 && \ #if CONFIG_PGTABLE_LEVELS > 4 && \
(defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) (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) unsigned long next, struct mm_walk *walk)
{ {
struct ptdump_state *st = walk->private; struct ptdump_state *st = walk->private;
p4d_t val = READ_ONCE(*p4d); p4d_t val = p4dp_get(p4d);
#if CONFIG_PGTABLE_LEVELS > 3 && \ #if CONFIG_PGTABLE_LEVELS > 3 && \
(defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) (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) unsigned long next, struct mm_walk *walk)
{ {
struct ptdump_state *st = walk->private; struct ptdump_state *st = walk->private;
pud_t val = READ_ONCE(*pud); pud_t val = pudp_get(pud);
#if CONFIG_PGTABLE_LEVELS > 2 && \ #if CONFIG_PGTABLE_LEVELS > 2 && \
(defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) (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) unsigned long next, struct mm_walk *walk)
{ {
struct ptdump_state *st = walk->private; 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 defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
if (pmd_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pte))) 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) unsigned long next, struct mm_walk *walk)
{ {
struct ptdump_state *st = walk->private; struct ptdump_state *st = walk->private;
pte_t val = ptep_get_lockless(pte); pte_t val = ptep_get(pte);
if (st->effective_prot_pte) if (st->effective_prot_pte)
st->effective_prot_pte(st, val); st->effective_prot_pte(st, val);