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Wed, 08 Oct 2025 18:58:41 -0700 (PDT) From: Samuel Holland To: Palmer Dabbelt , Paul Walmsley , linux-riscv@lists.infradead.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Conor Dooley , Alexandre Ghiti , Emil Renner Berthing , Andrew Morton , Rob Herring , Krzysztof Kozlowski , Anshuman Khandual , David Hildenbrand , Dev Jain , Lance Yang , SeongJae Park , Samuel Holland Subject: [PATCH v2 01/18] mm/ptdump: Replace READ_ONCE() with standard page table accessors Date: Wed, 8 Oct 2025 18:57:37 -0700 Message-ID: <20251009015839.3460231-2-samuel.holland@sifive.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20251009015839.3460231-1-samuel.holland@sifive.com> References: <20251009015839.3460231-1-samuel.holland@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Anshuman Khandual 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 Cc: David Hildenbrand Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Dev Jain Acked-by: Lance Yang Acked-by: SeongJae Park Signed-off-by: Anshuman Khandual Acked-by: David Hildenbrand Link: https://lore.kernel.org/r/20251001042502.1400726-1-anshuman.khandual@= arm.com/ Signed-off-by: Samuel Holland --- 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 add= r, unsigned long next, struct mm_walk *walk) { struct ptdump_state *st =3D walk->private; - pgd_t val =3D READ_ONCE(*pgd); + pgd_t val =3D pgdp_get(pgd); =20 #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 add= r, unsigned long next, struct mm_walk *walk) { struct ptdump_state *st =3D walk->private; - p4d_t val =3D READ_ONCE(*p4d); + p4d_t val =3D p4dp_get(p4d); =20 #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 add= r, unsigned long next, struct mm_walk *walk) { struct ptdump_state *st =3D walk->private; - pud_t val =3D READ_ONCE(*pud); + pud_t val =3D pudp_get(pud); =20 #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 a= ddr, unsigned long next, struct mm_walk *walk) { struct ptdump_state *st =3D walk->private; - pmd_t val =3D READ_ONCE(*pmd); + pmd_t val =3D pmdp_get(pmd); =20 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) if (pmd_page(val) =3D=3D virt_to_page(lm_alias(kasan_early_shadow_pte))) @@ -121,7 +121,7 @@ static int ptdump_pte_entry(pte_t *pte, unsigned long a= ddr, unsigned long next, struct mm_walk *walk) { struct ptdump_state *st =3D walk->private; - pte_t val =3D ptep_get_lockless(pte); + pte_t val =3D ptep_get(pte); =20 if (st->effective_prot_pte) st->effective_prot_pte(st, val); --=20 2.47.2