From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 51C72C98302 for ; Tue, 22 Sep 2026 17:13:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5573E6B009E; Tue, 22 Sep 2026 13:13:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 507226B009F; Tue, 22 Sep 2026 13:13:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3CF7E6B00A0; Tue, 22 Sep 2026 13:13:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 15D186B009E for ; Tue, 22 Sep 2026 13:13:19 -0400 (EDT) Received: from smtpin03.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id DB30C1605D8 for ; Tue, 22 Sep 2026 17:13:17 +0000 (UTC) X-FDA: 85242044034.03.9D60A2F Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf08.hostedemail.com (Postfix) with ESMTP id 0F203160004 for ; Tue, 22 Sep 2026 17:13:15 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=pCTPM03m; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf08.hostedemail.com: domain of usama.anjum@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=usama.anjum@arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1790097196; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=2/D8stMDM1jci6xr5VFuemNvKdV0P9MgsQ6v0FQ9TC0=; b=yN9Pp1eJDbAG0epcxNUU6lnd7oVKzoHFE4uj/yebFItDkoqWqq5KGDZnx31cjQ5i0gC4/i AGfG6X3HX5paY27fww7cfWXZ7RxNe+7MVIA62gSQwtkqjfepe1pxQ9slCADlhtJkYYIrUf 5zwKR4okWiOWQrQ5BG/hT1w9GO+3GsI= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=pCTPM03m; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf08.hostedemail.com: domain of usama.anjum@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=usama.anjum@arm.com ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790097196; b=iiucPu7Vk7V8iBDM37KJ4zgh38a3ZhMHAVFVP2J/r4P+MBq+uBUqxYJaN6tTaG37R3hKPy ajjROO7Hf0YdtYdaSAaQoxBzqu8tWytj0iWx1EILTlkZ6VIFila70gip7kuhCbySfynlZx P0+SFJ6OYMI7T77AhluJ3SzOxgkUZbI= 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 9E8A51595; Tue, 22 Sep 2026 10:13:11 -0700 (PDT) Received: from [127.0.1.1] (e142334-100.cambridge.arm.com [10.2.198.93]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 479AD3F86C; Tue, 22 Sep 2026 10:13:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790097195; bh=6PW1tkj08QGo8QdckrPX0ODHoxUb6pqu2veO+kTTZ/k=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=pCTPM03mJphkPxfc35zeUUsQF8Wf+c8WL4VK71wDLX28hB9HGW7S8BbVsmZ2JQk5T Yo0zY8RCJu6/8P4pPe9u2C/m6SJk9j0y0fparJfvZTMlzq4fTIbQBDrgjycGf2yHZq HemyfHlHgY+jLXxIgf46qiftTUNRZqsbU5Uy10Sg= From: Muhammad Usama Anjum Date: Tue, 22 Sep 2026 18:12:29 +0100 Subject: [PATCH v3 1/9] mm: introduce hw_pte_t for PTE table storage MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260922-pte0-v3-1-5670b8cb9059@arm.com> References: <20260922-pte0-v3-0-5670b8cb9059@arm.com> In-Reply-To: <20260922-pte0-v3-0-5670b8cb9059@arm.com> To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Xu Xin , Chengming Zhou , Jann Horn , Muchun Song , Oscar Salvador , Pedro Falcato , Arnd Bergmann , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , Pasha Tatashin , Rik van Riel , Harry Yoo , Lance Yang , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , Uladzislau Rezki , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Ian Rogers , Adrian Hunter , James Clark , SJ Park , "Matthew Wilcox (Oracle)" , Jan Kara , Jason Gunthorpe , John Hubbard , Peter Xu , Leon Romanovsky , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Usama Arif , Kiryl 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7H633MN2t/A8RufQF0h7V46wVzl4YRnointrzyoetSTU3Y55NSu8dPNtDpcOrr2vF0yTKFJwyydxW0FN9Cj9JSYoytgjvR1JUJfjlL3BdsEjt+HuPJaobtNssUCeQUSUyL+GkqoshPo1x3E5a0bEs935KxsQCUNNFCneEktAolOHA2BcsCp1NXP4NHeZj5hAlFH+52p/7DB+TZMeou/P4R6HcxYq3PZYTu/4e6HUw7rF6Oqy/Eo2IbTAxiiZqKeFrngyYTiOeHPKrJEep2d83xXHLfKgZaapJdE21ywh3NagPefvKwTpQzKYTjfUoyKYVv6D5Dw5Qs4NIiupZq3BOzmsvhV2kFWLyz79CLQk8ZOCOovW+HNpJd2ayUZvpK8cGW5cZ7t65Ucw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: pte_t is used both for software PTE values and for entries stored in a PTE table, so pte_t * does not distinguish a pointer to a software PTE value from a pointer to table storage. Introduce hw_pte_t as the generic name for a PTE table element. Define it as a macro alias of pte_t by default. When an architecture selects ARCH_HAS_HW_PTE_T, define it as a structure containing a pte_t instead. This preserves the representation while allowing converted architectures to enforce the distinction at compile time. Name the generic wrapper structure __hw_pte_t so architectures can forward-declare it when pgtable_t must be defined before the generic hw_pte_t typedef is visible. This avoids header-order dependencies. Keep the C type definitions behind an __ASSEMBLY__ check because architecture assembly sources can include this header indirectly. Include asm/page.h so consumers such as linux/vmalloc.h retain the page definitions they previously obtained from that header. Acked-by: David Hildenbrand (Arm) Signed-off-by: Muhammad Usama Anjum --- Changes since v1: - Name the generic wrapper structure __hw_pte_t so architectures can forward-declare it, and explain why this is required. - Use software PTE value terminology. Changes since RFC v1: - Add the ARCH_HAS_HW_PTE_T opt-in and generic wrapper definition. - Exclude the C type definitions from assembly sources. - Update the description for the new opt-in model. --- MAINTAINERS | 1 + include/linux/pgtable_types.h | 17 +++++++++++++++++ mm/Kconfig | 3 +++ 3 files changed, 21 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 2133aec4a2004..da60a8bdcddb5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17140,6 +17140,7 @@ F: include/linux/mmu_notifier.h F: include/linux/pagewalk.h F: include/linux/pgalloc.h F: include/linux/pgtable.h +F: include/linux/pgtable_types.h F: include/linux/ptdump.h F: include/linux/vmpressure.h F: include/linux/vmstat.h diff --git a/include/linux/pgtable_types.h b/include/linux/pgtable_types.h new file mode 100644 index 0000000000000..07da05d375c2c --- /dev/null +++ b/include/linux/pgtable_types.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_PGTABLE_TYPES_H +#define _LINUX_PGTABLE_TYPES_H + +#include + +#ifndef __ASSEMBLY__ + +#ifdef CONFIG_ARCH_HAS_HW_PTE_T +typedef struct __hw_pte_t { pte_t __pte; } hw_pte_t; +#else +#define hw_pte_t pte_t +#endif + +#endif /* !__ASSEMBLY__ */ + +#endif /* _LINUX_PGTABLE_TYPES_H */ diff --git a/mm/Kconfig b/mm/Kconfig index c1ddf59c0d71a..5f462ec6fa5e5 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1312,6 +1312,9 @@ comment "GUP_TEST needs to have DEBUG_FS enabled" config GUP_GET_PXX_LOW_HIGH bool +config ARCH_HAS_HW_PTE_T + bool + config DMAPOOL_TEST tristate "Enable a module to run time tests on dma_pool" depends on HAS_DMA -- 2.47.3