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 9DBD1437139; Mon, 13 Jul 2026 13:57:57 +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=1783951078; cv=none; b=ghGjwEqjwo7V7Je300D26Dff+J/Ap3HuqpMpKNvu3he1hoVLGJDycmJiQqZojKYhdVRnzcFH21d7RM3WB/y+i8ki5aNKWuoLUJaVLMmO7TNVcy4i7Z8XOKzjI0cf5Oscob31YzbzpUDzvOBCZqSC1JwjYrsXkSOb80629jicS4M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783951078; c=relaxed/simple; bh=Kej26z+gBagG9HQ6WbTine/W5VcGxHGbASgZAOow16A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KKo4EwVQ5ky6zCp2hI0/zkhr/wyKnX22qCiq0Xdt/D+oNf3Oc0B7i3cuImBLAklw0IqTp7Ce3XSXEbCc+udRxOL3fBan0YHdxVsRq1VCVMT5/RVstw8/bmpUgHUeoCtyHpYzSd0ApuKHIhGCyZ3Nr4cxDEMzYRXu02JHGBTxyM0= ARC-Authentication-Results:i=1; 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h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dWHgmUWYOHd4ghoMSrk0Xlu1ZLiyieBUVrKIzBFBNoEXXlquVPK8mzC3CvwKKIamc aUt3VH6A7Jp04fkfcylTei7ubrfjcTRqPGsZmZCBL6ATbvAZy9tqUe1ecybQrYrSYV A0sH2EH+D2P8v0DRt072FUB07yWqdhKRW9iEyhPU= From: Yeoreum Yun To: 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, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, x86@kernel.org, linux-mm@kvack.org, kasan-dev@googlegroups.com, linux-csky@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org Cc: david@kernel.org, linux@armlinux.org.uk, akpm@linux-foundation.org, ankur.a.arora@oracle.com, rppt@kernel.org, linmag7@gmail.com, chleroy@kernel.org, klarasmodin@gmail.com, chenhuacai@kernel.org, kernel@xen0n.name, kas@kernel.org, zhangtianyang@loongson.cn, wangyuli@aosc.io, tsbogend@alpha.franken.de, ljs@kernel.org, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, ryan.roberts@arm.com, pasha.tatashin@soleen.com, rmclure@linux.ibm.com, baolin.wang@linux.alibaba.com, tj@kernel.org, kevin.brodsky@arm.com, anup@brainfault.org, atish.patra@linux.dev, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, hannes@cmpxchg.org, mhocko@kernel.org, qi.zheng@linux.dev, shakeel.butt@linux.dev, kasong@tencent.com, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, anshuman.khandual@arm.com, yang@os.amperecomputing.com, chaitanyas.prakash@arm.com, ardb@kernel.org, guoren@kernel.org, yang.li85200@gmail.com, viro@zeniv.linux.org.uk, dinguyen@kernel.org, schuster.simon@siemens-energy.com, wangruikang@iscas.ac.cn, junhui.liu@pigmoral.tech, muchun.song@linux.dev, vishal.moola@gmail.com, namcao@linutronix.de, pavel@kernel.org, djbw@kernel.org, yu-cheng.yu@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, coxu@redhat.com, andreas@gaisler.com, liam@infradead.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, geert@linux-m68k.org, shorne@gmail.com, jonas@southpole.se, stefan.kristiansson@saunalahti.fi, Yeoreum Yun Subject: [RFC PATCH 07/34] mm/pgtable: define (pgd|p4d|pud)_offset_lockless() for folded page tables Date: Mon, 13 Jul 2026 14:55:46 +0100 Message-ID: <20260713135614.1618183-8-yeoreum.yun@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260713135614.1618183-1-yeoreum.yun@arm.com> References: <20260713135614.1618183-1-yeoreum.yun@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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) Signed-off-by: Yeoreum Yun --- 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 c6a5a43899b50..019c3f074b771 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 dbd38b4c3a056..ae2eff44889ac 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 6c9bca78047c4..5a2b0a81ae197 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) }) -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}