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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 Subject: Re: [PATCH v3 6/9] mm: add hw_pte_val for HW PTE storage To: David Hildenbrand References: <20260922-pte0-v3-0-5670b8cb9059@arm.com> <20260922-pte0-v3-6-5670b8cb9059@arm.com> <2dcd9dbc-99ca-4f5e-8e25-f42977763c84@kernel.org> From: Muhammad Usama Anjum Content-Language: en-US In-Reply-To: <2dcd9dbc-99ca-4f5e-8e25-f42977763c84@kernel.org> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: nH7EMUOlChvypZ8LW/M7zEkJFzvpf2FMIlWDpu14EZjipHXZHOqylWpoX3K3ZK7k1mJMdDb04seriXewyfuGCzPrjGjJMcu/7dsq7l3Knh/B19EuQV+Vu5SkGSD2+dODgLUF/ij02E05z1+cqIOVrVVTI1HtuD1DvZFloiujBaz3NgFXJLC3eM5CXoD4P88BO9k9QDKlpeipXu8P9wQflN4h+VRVG3G04/wt6evZqiQsTm80EJw2Y8BrnJA2lUgK7WnUFd0ZmXGYMcx74bKP/ay9+MPv5f6XvVyn36zvrX/u5hBvmZpLTOWqJu86ioipFBteEuDEPxBf60nmCl9uOcagtUkBIU7/zSLMIuOqv6FrSC/T+KJVzs9eVrwMnTzbAqqMGH7ils+tIMUZUbH+tNo6yPrIa49vVObrS/KFjqMG6jsk7cJOZWmD4YatRr1m X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Oct 2026 15:15:23.3486 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1226665c-440b-4721-8541-08df2097fb14 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: AMS1EPF0000008D.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAVPR08MB9305 On 01/10/2026 12:19 pm, David Hildenbrand (Arm) wrote: > On 9/22/26 19:12, Muhammad Usama Anjum wrote: >> Atomic PTE updates need an lvalue for the bits stored in an HW PTE. >> pte_val() only accepts a SW PTE value, so it cannot operate directly on >> a distinct hw_pte_t. >> >> Add hw_pte_val() to expose the underlying pte_val() lvalue. Access the >> wrapper's __pte member when hw_pte_t is distinct, and use pte_val() >> directly when it remains an alias of pte_t. >> >> Signed-off-by: Muhammad Usama Anjum >> --- >> Changes in v3: >> - Moved from the arm64 series to generic series as it makes more sense >> to add this in generic with all other changes. Usually we only add >> code where its get used. But this whole series wouldn't get used >> until an arch started using HW PTEs. >> --- >> include/linux/pgtable_types.h | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/include/linux/pgtable_types.h b/include/linux/pgtable_types.h >> index d6c5a7548550b..ee4eace5c3e1c 100644 >> --- a/include/linux/pgtable_types.h >> +++ b/include/linux/pgtable_types.h >> @@ -9,9 +9,13 @@ >> #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) >> + >> +#define hw_pte_val(x) pte_val((x).__pte) >> #else >> #define hw_pte_t pte_t >> #define __pte_from_hw(pte) (pte) >> + >> +#define hw_pte_val(x) pte_val(x) >> #endif > > I was just about to say: this series doesn't add any users. You should add that > detail to the patch description: "prepare for usage in arch code" or sth like that. > > With that > > Acked-by: David Hildenbrand (Arm) I'll add to the description. Thanks for reviewing. -- Thanks, Usama