From nobody Thu Oct 2 00:50:41 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id DB91CC2EA for ; Tue, 30 Sep 2025 02:52:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759200775; cv=none; b=JguhoYKyGbUmoinU04HACxCdPDNhkGyHbaTCaaROnMnJ/G23SwEkKHbtZgCnwqhY4onjgrfbjwOpGvEwXhHcFPt76WG9gEBwJNWWbrz18/pl1csPWyCD87cBpTQLF26iiGDhKHb/cxx85j1HMbKKFyt0W4J5Ynebt/HR64uRd2c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759200775; c=relaxed/simple; bh=qPZIR5JpwcWFfoVN6P8acZrXu4jZCgxA6XTZ1qkk3h8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=sMXvU4uYAOdeh6pVm6+llBZfFSnEAORA7MMzUWphLk3f1CD3r0SaON3ZBGxmXSRxaB975l26WikjvuAnaJD20JiLBUnso6oqWQX10FDrNrwqT6gi7oGB9TosANyQ5VtjPWMXiYeF+6SjmchCtmMh4WFMg0lzoTnJmdmsXCF/4ZQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9F873497; Mon, 29 Sep 2025 19:52:43 -0700 (PDT) Received: from ergosum.cambridge.arm.com (ergosum.cambridge.arm.com [10.1.196.45]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CCE443F5A1; Mon, 29 Sep 2025 19:52:50 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Cc: Anshuman Khandual , Andrew Morton , David Hildenbrand , linux-kernel@vger.kernel.org Subject: [PATCH] mm/ptdump: Replace READ_ONCE() with standard page table accessors Date: Tue, 30 Sep 2025 03:52:46 +0100 Message-Id: <20250930025246.1143340-1-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.30.2 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" 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. Cc: Andrew Morton Cc: David Hildenbrand Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual Acked-by: Lance Yang Acked-by: SeongJae Park Reviewed-by: Dev Jain --- mm/ptdump.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/mm/ptdump.c b/mm/ptdump.c index b600c7f864b8..18861501b533 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))) --=20 2.30.2