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 0A0A7559CBC; Tue, 22 Sep 2026 17:13:55 +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=1790097236; cv=none; b=qA3A0X2hIVI6X/Aen79SPOFIV7QEwLMM6Ny6xQpRUgAMPxUkMMW6CXUYtFfLzcgA+MlflEDZn6ArpuIKfvo+wNMkUwx4Iu8ZzHB3FJel4VIJ0pPMsVCHOQmhqODEnK9zRWL2lr0/s9KrSEwP0SZ1p47pdjVzqbBoA/Sex1CV5d0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790097236; c=relaxed/simple; bh=VSAJHWUAe7NS76HVRAMjNd0GQzrtewrgnfoeWDUMlnY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Eo2lcE/n15b/rak5xaZWVxmX/OCPCwA3TZKAv559MeZW/0A1cpLh/tytNfiAJErAdM15VdnugZozcksEKR8ubEIgIye6t1Zot3RTBdfyfaZcyInxpcsl76OZYLss+EjUFh7FDyN+aqViqHHa75uHx6uceRujwWlrRugs7gsVtmU= 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=FVt56hju; 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="FVt56hju" 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 0AD2A1BC0; Tue, 22 Sep 2026 10:13:51 -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 C46153F86C; Tue, 22 Sep 2026 10:13:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790097234; bh=VSAJHWUAe7NS76HVRAMjNd0GQzrtewrgnfoeWDUMlnY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=FVt56hjuBPaMyg/BnFKqE4fzU1cEu6NBRc7MPH68RUYG/CCz6y6YC9RG6hPWhN96x x9hwL9qrWyGY3gHSBta6j4l7PueQkx2vM6HZNIWXJTPqHrodyx2R2jU4yzc9rQNtJ/ 1suYvsUR4FuoJM/twYHmYXuJo99AkA0nApGsDh9M= From: Muhammad Usama Anjum Date: Tue, 22 Sep 2026 18:12:32 +0100 Subject: [PATCH v3 4/9] mm: convert PTE table entries in ptep_get() 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: <20260922-pte0-v3-4-5670b8cb9059@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 Shutsemau , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Miaohe Lin , Naoya Horiguchi , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Dennis Zhou , Tejun Heo , Christoph Lameter , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, damon@lists.linux.dev, kasan-dev@googlegroups.com, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, xen-devel@lists.xenproject.org, Muhammad Usama Anjum X-Mailer: b4 0.16.0 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