From: Samuel Holland <samuel.holland@sifive.com>
To: Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <pjw@kernel.org>,
linux-riscv@lists.infradead.org
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Conor Dooley <conor@kernel.org>,
Alexandre Ghiti <alex@ghiti.fr>,
Emil Renner Berthing <kernel@esmil.dk>,
Andrew Morton <akpm@linux-foundation.org>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Anshuman Khandual <anshuman.khandual@arm.com>,
David Hildenbrand <david@redhat.com>, Dev Jain <dev.jain@arm.com>,
Lance Yang <lance.yang@linux.dev>, SeongJae Park <sj@kernel.org>,
Samuel Holland <samuel.holland@sifive.com>
Subject: [PATCH v2 01/18] mm/ptdump: Replace READ_ONCE() with standard page table accessors
Date: Wed, 8 Oct 2025 18:57:37 -0700 [thread overview]
Message-ID: <20251009015839.3460231-2-samuel.holland@sifive.com> (raw)
In-Reply-To: <20251009015839.3460231-1-samuel.holland@sifive.com>
From: Anshuman Khandual <anshuman.khandual@arm.com>
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.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Dev Jain <dev.jain@arm.com>
Acked-by: Lance Yang <lance.yang@linux.dev>
Acked-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20251001042502.1400726-1-anshuman.khandual@arm.com/
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
---
Changes in v2:
- New patch for v2 (taken from LKML)
mm/ptdump.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/mm/ptdump.c b/mm/ptdump.c
index b600c7f864b8b..973020000096c 100644
--- 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);
--
2.47.2
next prev parent reply other threads:[~2025-10-09 1:58 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-09 1:57 [PATCH v2 00/18] riscv: Memory type control for platforms with physical memory aliases Samuel Holland
2025-10-09 1:57 ` Samuel Holland [this message]
2025-10-09 9:34 ` [PATCH v2 01/18] mm/ptdump: Replace READ_ONCE() with standard page table accessors David Hildenbrand
2025-10-09 1:57 ` [PATCH v2 02/18] perf/core: " Samuel Holland
2025-10-09 2:03 ` Anshuman Khandual
2025-10-09 1:57 ` [PATCH v2 03/18] mm: Move the fallback definitions of pXXp_get() Samuel Holland
2025-10-09 1:57 ` [PATCH v2 04/18] mm: Always use page table accessor functions Samuel Holland
2025-10-09 2:10 ` Anshuman Khandual
2025-10-09 1:57 ` [PATCH v2 05/18] mm: Allow page table accessors to be non-idempotent Samuel Holland
2025-10-09 1:57 ` [PATCH v2 06/18] riscv: hibernate: Replace open-coded pXXp_get() Samuel Holland
2025-10-09 1:57 ` [PATCH v2 07/18] riscv: mm: Always use page table accessor functions Samuel Holland
2025-10-09 1:57 ` [PATCH v2 08/18] riscv: mm: Simplify set_p4d() and set_pgd() Samuel Holland
2025-10-09 1:57 ` [PATCH v2 09/18] riscv: mm: Deduplicate _PAGE_CHG_MASK definition Samuel Holland
2025-10-09 1:57 ` [PATCH v2 10/18] riscv: ptdump: Only show N and MT bits when enabled in the kernel Samuel Holland
2025-10-09 1:57 ` [PATCH v2 11/18] riscv: mm: Fix up memory types when writing page tables Samuel Holland
2025-10-09 1:57 ` [PATCH v2 12/18] riscv: mm: Expose all page table bits to assembly code Samuel Holland
2025-10-09 1:57 ` [PATCH v2 13/18] riscv: alternative: Add an ALTERNATIVE_3 macro Samuel Holland
2025-10-09 1:57 ` [PATCH v2 14/18] riscv: alternative: Allow calls with alternate link registers Samuel Holland
2025-10-09 1:57 ` [PATCH v2 15/18] dt-bindings: riscv: Describe physical memory regions Samuel Holland
2025-10-09 12:37 ` Rob Herring (Arm)
2025-10-09 1:57 ` [PATCH v2 16/18] riscv: mm: Use physical memory aliases to apply PMAs Samuel Holland
2025-10-10 15:06 ` Emil Renner Berthing
2025-10-10 16:12 ` Samuel Holland
2025-10-10 17:04 ` Emil Renner Berthing
2025-10-10 18:01 ` Samuel Holland
2025-10-10 19:55 ` Emil Renner Berthing
2025-10-09 1:57 ` [PATCH v2 17/18] riscv: dts: starfive: jh7100: Use physical memory ranges for DMA Samuel Holland
2025-10-10 14:19 ` Emil Renner Berthing
2025-10-10 16:51 ` Samuel Holland
2025-10-14 9:14 ` Conor Dooley
2025-10-09 1:57 ` [PATCH v2 18/18] riscv: dts: eswin: eic7700: " Samuel Holland
2025-10-10 1:15 ` [PATCH v2 00/18] riscv: Memory type control for platforms with physical memory aliases Andrew Morton
2025-10-10 17:17 ` Samuel Holland
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