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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, 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: Re: [PATCH RFC 01/11] mm: introduce hw_pte_t for PTE table storage To: Anshuman Khandual , =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= References: <20260727164715.2866609-1-usama.anjum@arm.com> <20260727164715.2866609-2-usama.anjum@arm.com> <6xah74eadjmo2bozyr62wcxo4hhpsiufx2mshh7tztyy2dzzps@63m327m7pl5u> From: Muhammad Usama Anjum Content-Language: en-US In-Reply-To: <6xah74eadjmo2bozyr62wcxo4hhpsiufx2mshh7tztyy2dzzps@63m327m7pl5u> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: RBLROo5LiXS9uRgF34qTjim0wy19yK/eljpxXW0xvMggAoapFBz7lMXDw5Mwvqv2Fs3OGn1gD5anpvnhGf58NYa1Tk+IDYCnJ5kwjQkQ/koCnaFQp4JHJ9KgOIXnbj5bHJd+BEzgzzkuKX7a/5n9xPS7GbQDLZN62PaLbQxFVXUgYRkJR9ggJeHL3xiLcIJ5MzT62aKAKva3MI16Rc6y9uurr7Hsm9UGFdmC+GR9lCISR21RBLN+na/snbZrYb57C6grujG9yUHTbBopj+KIB10zX8OWI0IunkHd2NFpteTKd8WUZ0arTedwGYlI5/dETTMvtV+hj+hCWxB8C2Xb4PMbgL5u7ZD4CkT12KrJecNDeC0MEdggInAVlZv2peDghr0BwJQEFld88znFQL2v8a1OF8pRuyTqfhrvVZTPQUIL4KlUpwX8uk7u5PiNHSSD X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Jul 2026 10:20:41.1870 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b9a6f79d-2568-4a69-150e-08deeeed5fa6 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DU2PEPF00028D04.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU4PR08MB11717 On 31/07/2026 6:49 am, Anshuman Khandual wrote: > On Mon, Jul 27, 2026 at 05:46:52PM +0100, Muhammad Usama Anjum wrote: >> pte_t is used both for logical PTE values and for entries stored in a PTE >> table, so pte_t * does not distinguish a pointer to a copied value from a >> pointer to table storage. > > Should we rather call them as "Linux PTE" and "HW PTE" instead ? > > Some like "Logical PTE" does not really sound very clear on what it represents. Yeah, I should make distinction more visible in the cover letter. > >> >> Introduce hw_pte_t as the generic name for a PTE table element. Define it >> as an alias of pte_t by default so architectures retain their existing >> representation and behavior until they opt in to a distinct storage type. > > Makes sense. > >> >> Include asm/page.h so pte_t is defined before the generic alias. >> >> Signed-off-by: Muhammad Usama Anjum >> --- >> MAINTAINERS | 1 + >> include/linux/pgtable_types.h | 11 +++++++++++ >> 2 files changed, 12 insertions(+) >> create mode 100644 include/linux/pgtable_types.h >> >> diff --git a/MAINTAINERS b/MAINTAINERS >> index 15dd00c7ffec5..78aac05949829 100644 >> --- a/MAINTAINERS >> +++ b/MAINTAINERS >> @@ -16981,6 +16981,7 @@ 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 > > s/pgtable_types.h/pgtable_hw_types.h ? I prefer shorter file names. > >> 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..ed5dba42a4f8c >> --- /dev/null >> +++ b/include/linux/pgtable_types.h >> @@ -0,0 +1,11 @@ >> +/* SPDX-License-Identifier: GPL-2.0 */ >> +#ifndef _LINUX_PGTABLE_TYPES_H >> +#define _LINUX_PGTABLE_TYPES_H >> + >> +#include >> + >> +#ifndef __HAVE_ARCH_HW_PTE_T > > __HAVE_ARCH_HW_PTE_T macro is a better approach here or a config ARCH_HAS_HW_PTE_T > based selective platform subscription should be introduced instead ? Moving to CONFIG_ARCH_HAS_PTE_T from the next version as suggested here [1]. [1] https://lore.kernel.org/all/78a0402d-5436-4aab-a704-90fab56eec50@kernel.org -- Thanks, Usama