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 53A564137AE; Thu, 6 Aug 2026 08:40:38 +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=1786005644; cv=none; b=fn2GoI7uv2YyiwieOEtpses6ctDMYfcff/EdTC4biPjGUSRx9Bss8ofy28o8Dd1pOKA4E2iV0c6/YswDXBZfxPOqfZr60vDt1PDW979DkBZAGIp4Od0+2LqPcb8ULFBNBkBQyGQd6xUvTxrttycp5JFBGf8vXlqfqkyAcUf/+Ts= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786005644; c=relaxed/simple; bh=N7Kx8cypRY/4tgLqgkZyPCXbOC37nDVo81ML0oOq7lc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GI4eUZHkrkvHusC0F9rWm3h7HNwySEF7SDULYAyBVk5HuG29reGi+NaBiJIB7rFJlsRleAcaKhHwN/z0SFTp7ZLfE42NGUc+/lXWwsRC34Wl4B3Q094BKGdtO7XF0JJUkMf80QS5RWWJujJnKixqAkdQDRE8uLZOGJV+4UNqXjI= 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=tagQFezC; 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="tagQFezC" 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 639B819F0; Thu, 6 Aug 2026 01:40:30 -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 4AF5F3F9A2; Thu, 6 Aug 2026 01:40:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1786005634; bh=N7Kx8cypRY/4tgLqgkZyPCXbOC37nDVo81ML0oOq7lc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tagQFezCw9aBUWT7bOfI3ipYrSvBgGoc0nvAu5XpEVT8jAWZTUXoDkAzn54+nSZu/ C0359lFjQAXDgtRxm2t3RSVQ591J+t3FxW0ZNLk6ZGX5bMdhv/n3Wr7ekNo3EB6nJi fG5//UTE+Z1Arn0RcPLdaPIBOCt1BQtKZG1psE+U= 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 5/9] mm: convert PTE table entries in ptep_get() Date: Thu, 6 Aug 2026 09:38:43 +0100 Message-ID: <20260806083926.1807279-6-usama.anjum@arm.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260806083926.1807279-1-usama.anjum@arm.com> References: <20260806083926.1807279-1-usama.anjum@arm.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ptep_get() now accepts a pointer to hw_pte_t storage but must continue to return a logical pte_t 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 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 dad80d264aac2..1768421755a9c 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 70c3edd00a01b..a625516fd67b1 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 { 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