From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id D4BD0472F93; Wed, 22 Jul 2026 15:31:30 +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=1784734292; cv=none; b=GiKKTe6Dg0kjITvESLA15iWxZJ4sl/BfDrs6fmf8UGmWSND+2wghOucSzkn/PguS0xkSvbNQifgk1B/UtuoQ3QLb5O3uMMKTNoFFVdFtEwOIy+LDOAOBLMI7RDBPGQgxd8YRm6HXkXQENYbrYs3hX2o6V30WCrU5OBP/L8IJBw0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784734292; c=relaxed/simple; bh=EDS9AlMeDxpN0DuuA4Bhb7IK1Ve/HomsYNUzHrnpR4I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=TQE4cugxcKA5xDgDO76Aw7UhizLTh4M+WaV2BAboo2s+ovUQ30KhWjSjuCEVEt/ZNcfOeq1uTAaGUa71MnVYhuhO7KswyF6lwhaiXYfQt1Ni0ZGCUe92eOZUknwKmDMbgz6uNQlDC/7eqQVTETtupSwm1jtIH0tzMayMIJrVEww= 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; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=eo9nYy+0; 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="eo9nYy+0" 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 1AF1D168F; Wed, 22 Jul 2026 08:31:26 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 72B903F66F; Wed, 22 Jul 2026 08:31:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784734290; bh=EDS9AlMeDxpN0DuuA4Bhb7IK1Ve/HomsYNUzHrnpR4I=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=eo9nYy+06fIf8UQQOHpRhtRbtJUHdIHU5M4nAex7G3P7astgDStgdt2hMeQyYAqSe yo8B2FWjYpXyyHByHNmKAvHBdA0m4zv6FwrlLGp/vPnM/Thugqw0A32y7kI2is2ohe HBjlOUMx1+Pk6p1UZMYZKJxrrKYZ3iaYd/Q0V6kQ= From: Yeoreum Yun Date: Wed, 22 Jul 2026 16:30:15 +0100 Subject: [PATCH RFC v2 07/20] mm/pgtable: define (pgd|p4d|pud)_offset_lockless() for folded page tables Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260722-dummy_ptxp3-v2-7-d9e4bad31e0a@arm.com> References: <20260722-dummy_ptxp3-v2-0-d9e4bad31e0a@arm.com> In-Reply-To: <20260722-dummy_ptxp3-v2-0-d9e4bad31e0a@arm.com> To: Russell King , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , Catalin Marinas , Will Deacon , Arnd Bergmann , Andrew Morton , Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Johannes Weiner , David Hildenbrand , Michal Hocko , Lorenzo Stoakes , Tianrui Zhao , Bibo Mao , Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonas Bonn , Stefan Kristiansson , Stafford Horne Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-openrisc@vger.kernel.org X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2393; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=cKWNMRXsJxpGGQUCO3dJXUBeTYEap08Ll2GdMvnbC84=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqYOISgRJKMSvsCYR1STuAZc/EAmMgILlkU4XaH 4rLJvbb3vSJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCamDiEgAKCRBt1cPRWsUx MzugC/42IcDVD5LxkniPNsBlkfghPK1wDyrSWxWr7TeFTU6ejjtMKTztgT4RF+0h3SxczGZ3zfL m8DyL1Z/YOze8tkRyHQ+9aaZuP1UcIWo0J068oU8zBIGy/e1xo0qcFy+HNb5ifhKaSp/vqXVq7I /CORT3klFa/PhxiK1FiYRxln768srrbd+G4S7s/j5I0VRIJHf7rkLAoGqbP2sLn+dZ0b1UlggYJ 1wr6TMPzn4sfrdgq6Hj8WYTYdddMWcODgOQkHiW0s0qaJW6UZo5f6Jqfonw5Wmhlqb7wj0c3MBq kjZxDGOUKw4fVaREwFlSqCNq/Rx7z7Kd4iwRp4lIuNcc0KPeY7Gpo3D67A+mXQmj2oItT5Oe4h5 mJKipfT4xSDeBAnIDui/JSryAXoNEcWeMA/xfJfC1YGH7hZDa5rWPdbWplDOCWyd/9urEXKuKNo jIZ/6eL7alizPWnvSAgA0uJjIti7vbu5VdGE9+KfBk/IAandrmJNpv3QYgD22NJ68bnqY= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 From: "David Hildenbrand (Arm)" The default helpers fallback to pud_offset(), passing a pointer to the stack value. Let's provide variants that do exactly what (pgd|p4d|pud)_offset() do, but ignore the passed pgd_t/p4d_t/pud_t, consequently not working on a pointer to the stack value like the default handlers would. Signed-off-by: David Hildenbrand (Arm) --- include/asm-generic/pgtable-nop4d.h | 7 +++++++ include/asm-generic/pgtable-nopmd.h | 7 +++++++ include/asm-generic/pgtable-nopud.h | 7 +++++++ 3 files changed, 21 insertions(+) diff --git a/include/asm-generic/pgtable-nop4d.h b/include/asm-generic/pgtable-nop4d.h index c6a5a43899b5..019c3f074b77 100644 --- a/include/asm-generic/pgtable-nop4d.h +++ b/include/asm-generic/pgtable-nop4d.h @@ -39,6 +39,13 @@ static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) return (p4d_t *)pgd; } +static inline p4d_t *p4d_offset_lockless(pgd_t *pgdp, pgd_t pgd, + unsigned long address) +{ + return (p4d_t *)pgdp; +} +#define p4d_offset_lockless p4d_offset_lockless + #define p4d_val(x) (pgd_val((x).pgd)) #define __p4d(x) ((p4d_t) { __pgd(x) }) diff --git a/include/asm-generic/pgtable-nopmd.h b/include/asm-generic/pgtable-nopmd.h index dbd38b4c3a05..ae2eff44889a 100644 --- a/include/asm-generic/pgtable-nopmd.h +++ b/include/asm-generic/pgtable-nopmd.h @@ -50,6 +50,13 @@ static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address) } #define pmd_offset pmd_offset +static inline pmd_t *pmd_offset_lockless(pud_t *pudp, pud_t pud, + unsigned long address) +{ + return (pmd_t *)pudp; +} +#define pmd_offset_lockless pmd_offset_lockless + #define pmd_val(x) (pud_val((x).pud)) #define __pmd(x) ((pmd_t) { __pud(x) } ) diff --git a/include/asm-generic/pgtable-nopud.h b/include/asm-generic/pgtable-nopud.h index 6c9bca78047c..5a2b0a81ae19 100644 --- a/include/asm-generic/pgtable-nopud.h +++ b/include/asm-generic/pgtable-nopud.h @@ -47,6 +47,13 @@ static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) } #define pud_offset pud_offset +static inline pud_t *pud_offset_lockless(p4d_t *p4dp, p4d_t p4d, + unsigned long address) +{ + return (pud_t *)p4dp; +} +#define pud_offset_lockless pud_offset_lockless + #define pud_val(x) (p4d_val((x).p4d)) #define __pud(x) ((pud_t) { __p4d(x) }) -- 2.43.0