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 7CECEC624DA for ; Thu, 3 Sep 2026 10:31:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 762A86B00C2; Thu, 3 Sep 2026 06:31:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 739C16B00C4; Thu, 3 Sep 2026 06:31:28 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 64FA26B00C5; Thu, 3 Sep 2026 06:31:28 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 3B24F6B00C2 for ; Thu, 3 Sep 2026 06:31:28 -0400 (EDT) Received: from smtpin13.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id C30E3A04DB for ; Thu, 3 Sep 2026 10:31:27 +0000 (UTC) X-FDA: 85172084214.13.BE3693E Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf23.hostedemail.com (Postfix) with ESMTP id 228FB14000C for ; Thu, 3 Sep 2026 10:31:26 +0000 (UTC) Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=QvHhv94l; spf=pass (imf23.hostedemail.com: domain of usama.anjum@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=usama.anjum@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1788431486; b=QWskA5Ogdoy50rwng3AE0c157xJON2Na6N3AaYVvHOruF0xddyxYf5QDMYSGojTnFZwnG6 UPZOum8e50Z2R/wVPVWDgQTqexwf83M9TjfPI4PrRzxdAjGvwcHW3n1UUkCCkYcN7AkjsP Ri18edFvjqFOeW8NRoqQeZzMGeppKBI= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=QvHhv94l; spf=pass (imf23.hostedemail.com: domain of usama.anjum@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=usama.anjum@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1788431486; 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-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=aIO/sh25/2DXIdJ1qYo6inYe04x5bulIz7HJbN4c8lE=; b=n5ELPwwo2rMM5RVqK+cq5AuR6kle2j1cE8uEeGsw39eWCpM7TqtkZ1gKPC3vrsQtKaEOqr 9QHjYUbopWF6NNKSpo4qoExU5RWqhUslPjOCrctHHUhewBsrpfaRReaKrs/GZ2f9MLxG2V Ah3zJhTSS/7UW8R50kK+RdG5TEqrfJk= 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 5BA421596; Thu, 3 Sep 2026 03:31:21 -0700 (PDT) Received: from e142334-100.cambridge.arm.com (e142334-100.cambridge.arm.com [10.2.198.93]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id F28AE3F673; Thu, 3 Sep 2026 03:31:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1788431485; bh=wa6kw8wVjvVd2W8nAbhMf4/QKJIqMNke43dTRJ3tbuU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QvHhv94lVGWx7TmcPQBRk7OR/PvY0hnXRhX9xVN5Y4qN+GDaWN+Xshh7VTAkVLSnY Jdi6olRL94sQmWoyHi9kc6yp4HLF2iZAObXc9xsiPZr5FAVO73li6Y/Q2PlXwZuEJi tFBQkMsde8wyKBlpx9nCFXxKYf2kd54KRIoPFYKU= From: Muhammad Usama Anjum To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Dimitri Sivanich , Arnd Bergmann , Greg Kroah-Hartman , "James E.J. Bottomley" , Helge Deller , Juergen Gross , Stefano Stabellini , Muchun Song , Oscar Salvador , Andrew Morton , "Liam R. Howlett" , Lorenzo Stoakes , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , Andrey Ryabinin , David Hildenbrand , Pasha Tatashin , Chris Li , Kairui Song , Uladzislau Rezki , Steven Rostedt , Masami Hiramatsu , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , SJ Park , "Matthew Wilcox (Oracle)" , Jan Kara , Jason Gunthorpe , Leon Romanovsky , Miaohe Lin , Dennis Zhou , Tejun Heo , Christoph Lameter , Mike Rapoport , Johannes Weiner , ziy@nvidia.com, pfalcato@suse.de, agordeev@linux.ibm.com, ryan.roberts@arm.com Cc: Muhammad Usama Anjum , linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-parisc@vger.kernel.org, xen-devel@lists.xenproject.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, kasan-dev@googlegroups.com, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, damon@lists.linux.dev Subject: [PATCH v2 4/8] mm: convert PTE table entries in ptep_get() Date: Thu, 3 Sep 2026 11:29:56 +0100 Message-ID: <20260903103002.1091859-5-usama.anjum@arm.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260903103002.1091859-1-usama.anjum@arm.com> References: <20260903103002.1091859-1-usama.anjum@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 228FB14000C X-Stat-Signature: ofrf9y9crgunoay95w89ap7wyuowdhue X-Rspam-User: X-HE-Tag: 1788431486-679337 X-HE-Meta: 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 vzVVzcRS NsfN0mrG0uxHWBSP0c7zLkxS7T/F28yFdQbmvsA/w7lvYUYV70OKYLxf10LxkM281YkETrCCyz0LFrCkEuCiwMp6hXRF/9y7sIqAa2e9ycnNng9BbuNrQqeyCvj1rb1zlEKsonQvZ6WhRAr4yFl0+18fjZO40E3g1vMlmXSmyCTwB52nwaV3yVBWm3cFFu2pIFdtWXIbQGN+SQgn7W8p4wqLSjxHPwCttdhKFhHdl5Mt5D73Xk9VA3WNzKhzWJcpe+kyEu+xdGvruqi26EbpSf2C7yYkq0eu8683Z/2RcVKdAitHImgGWR0aH+u9JPnfB1XdaKfVKbm+Jg7p4dPberBcFpG0DMeS6T3Ej3t1/96aGM84= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: ptep_get() now accepts a pointer to hw_pte_t storage but must continue to return a software PTE value. Add __pte_from_hw for both generic hw_pte_t definitions. Read the hw_pte_t table element atomically before converting it to pte_t. Signed-off-by: Muhammad Usama Anjum --- Changes since v1: - Use software PTE value terminology. Changes since RFC v1: - Define __pte_from_hw for the opted-in generic wrapper. - Apply READ_ONCE() to hw_pte_t before converting it to pte_t. --- include/linux/pgtable.h | 2 +- include/linux/pgtable_types.h | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 19098e302b75a..41337da0d65aa 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -493,7 +493,7 @@ static inline int pudp_set_access_flags(struct vm_area_struct *vma, #ifndef ptep_get static inline pte_t ptep_get(hw_pte_t *ptep) { - return READ_ONCE(*ptep); + return __pte_from_hw(READ_ONCE(*ptep)); } #endif diff --git a/include/linux/pgtable_types.h b/include/linux/pgtable_types.h index 07da05d375c2c..d6c5a7548550b 100644 --- a/include/linux/pgtable_types.h +++ b/include/linux/pgtable_types.h @@ -8,8 +8,10 @@ #ifdef CONFIG_ARCH_HAS_HW_PTE_T typedef struct __hw_pte_t { pte_t __pte; } hw_pte_t; +#define __pte_from_hw(pte) ((pte).__pte) #else #define hw_pte_t pte_t +#define __pte_from_hw(pte) (pte) #endif #endif /* !__ASSEMBLY__ */ -- 2.47.3