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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, 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 05/11] mm: convert PTE table entries in ptep_get() To: Alexander Gordeev References: <20260727164715.2866609-1-usama.anjum@arm.com> <20260727164715.2866609-6-usama.anjum@arm.com> <34eed5fd-c569-49d8-bc4d-a3d4b1207fbd-agordeev@linux.ibm.com> <9ac3f058-2a22-4801-8633-65635053c8ea-agordeev@linux.ibm.com> From: Muhammad Usama Anjum Content-Language: en-US In-Reply-To: <9ac3f058-2a22-4801-8633-65635053c8ea-agordeev@linux.ibm.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: GnHito13rtD0+R8giYgj2gyEWJUJ+05TWz75tYOpyUUd7mBIwK8iRxKxv6y1LmFfVn+lf89MxOKKs2OfAnxijJTnTabRLmTy55iUAmdu0pr3svM76dmUxX0nrLDqp1kKq10a3DBVzdSSTkwitroLxdwMgda6orZiePRDVDyida8FIiVdbY3OIauB0hA2fWt9dviOr2nWONPBJYd4FcwsSrkB3EeU2L0vtTjjGzfUS3x0k3claKZJVlx40RJlg02LQo/EyAhJXXcqElOA2wLmxdDQchlxrqRZseNOJN/ABrGHxNt3hZA6b+NyVUVrjEfW68/M/Nz4ZeIYcUqsfwUP4wxUu7g3rBWTqK2R62BJ5LjTSkWH6cqm9L1uBaCExMr1QBG2RNtXcSEfh8a8dLxus0Xf/MlqyUxzr9d3kSxg7HS/A6tODRjGM7816btMO4EX X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jul 2026 10:26:40.1273 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3b841e14-fa98-454f-9c52-08deee250b31 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: AMS1EPF00000045.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV1PR08MB10455 On 30/07/2026 11:24 am, Alexander Gordeev wrote: > On Thu, Jul 30, 2026 at 11:11:35AM +0100, Muhammad Usama Anjum wrote: >> On 30/07/2026 11:08 am, Alexander Gordeev wrote: >>> On Mon, Jul 27, 2026 at 05:46:56PM +0100, Muhammad Usama Anjum wrote: >>>> 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() as the conversion hook >>>> and apply it in the generic ptep_get() implementation. >>>> >>>> Signed-off-by: Muhammad Usama Anjum >>>> --- >>>> include/linux/pgtable.h | 2 +- >>>> include/linux/pgtable_types.h | 1 + >>>> 2 files changed, 2 insertions(+), 1 deletion(-) >>>> >>>> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h >>>> index dad80d264aac2..3003ac9cd81fe 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 READ_ONCE(__pte_from_hw(*ptep)); >>> >>> Should it be something like? >>> >>> return __pte_from_hw(READ_ONCE(*ptep)); >> I'd thought about it. My thinking is that we should get the pte_t first before >> before calling READ_ONCE(). Please correct me what makes more sense? > > I have a problem with "get the pte_t first" part ;) I think what we want > is atomically read the hw_pte_t from the HW table and then convert the > result to pte_t. Got it. I'll fix it in the next version. > >>> >>>> } >>>> #endif >>>> >>>> diff --git a/include/linux/pgtable_types.h b/include/linux/pgtable_types.h >>>> index ed5dba42a4f8c..61afe27307ec2 100644 >>>> --- a/include/linux/pgtable_types.h >>>> +++ b/include/linux/pgtable_types.h >>>> @@ -6,6 +6,7 @@ >>>> >>>> #ifndef __HAVE_ARCH_HW_PTE_T >>>> #define hw_pte_t pte_t >>>> +#define __pte_from_hw(pte) (pte) >>>> #endif >>>> >>>> #endif /* _LINUX_PGTABLE_TYPES_H */ >>>> -- >>>> 2.47.3 >>>> >> >> -- >> Thanks, >> Usama >> -- Thanks, Usama