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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: OrutTkQ7F1TUY6sIpdJLIv9bJcG6L6DJd/qpcnhRZJKoL+2bd8oP37dOhIuSiPzni3612a8Drr9uEH+NNrYjozxIa1VIC1DZBSjyufH11sXERYTd4wxLd4LTFzzkGkjfk8BKQaOwxeE+k+BG8IoU8CEp4AkSXQX15Lr10zp7cviVo08pqzbz91sZhrTPpEOmlKXyrbT7gRwEsTu/jakIEX5/LKXUNiSq2wYunPIf+t97d1exyJBmiJJal+p19IOroktD5/dEgMbx/YXcR30+R9mCcKQDz/WKanUEE3cPEldN1FAYXU4gSFCdXMrDNgNmNikZuaVzd8+pWQzJNLxRHPO+rMA3Mku8SLj/FLmdLdevzEyVh9/8msfFrKfRNOKKvvZelvbICFNy/slAyGqAai5W6TXlNgZi/cWLA/GPg527oBfnzycxxjVl8TEQ1n/l X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Aug 2026 18:38:55.8772 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a9cd9005-6e52-420f-e8c0-08def18e7987 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: DB5PEPF00014B88.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB4PR08MB9357 On 03/08/2026 5:43 pm, Pedro Falcato wrote: > Since forever, MM code has thrown pte_t * around with no concern for const > safety, or typesafety of any kind. This is confusing. Attempt to address it > by: > 1) Making sure pte_get*() helpers can cope with const pte_t * arguments > 2) Constifying the pte_offset_map_ro_nolock() return type, which by definition > already pledges that users will not write to it. > > These two simple steps were already able to uncover code smell from > khugepaged + do_swap_page(). > > Separate steps could include introducing pte_offset_map_ro_lock() for more > widespread usage of this. > > Benefits of this include less confusion and better type-safety. It could also > futurely aid in efforts such as [0] which may want semantic annotation of these > accesses. > > Based on mm-unstable and compile-tested on a handful of architectures. > > No functional changes intended. I've reviewed the entire series. Hence: Reviewed-by: Muhammad Usama Anjum > > [CC list editorially trimmed for brevity reasons; apologies if you're not on it] > > Link: https://lore.kernel.org/linux-mm/20260526-kpkeys-v8-0-eaaacdacc67c@arm.com/#t [0] > Cc: Catalin Marinas > Cc: Will Deacon > Cc: "James E.J. Bottomley" > Cc: Helge Deller > Cc: Madhavan Srinivasan > Cc: Michael Ellerman > Cc: Lorenzo Stoakes > Cc: "Liam R. Howlett" > Cc: Vlastimil Babka > Cc: Mike Rapoport > Cc: Suren Baghdasaryan > Cc: Michal Hocko > Cc: "Matthew Wilcox (Oracle)" > Cc: Jan Kara > Cc: Zi Yan > Cc: Baolin Wang > Cc: Nico Pache > Cc: Ryan Roberts > Cc: Dev Jain > Cc: Barry Song > Cc: Lance Yang > Cc: Usama Arif > Cc: Kevin Brodsky > Cc: Muhammad Usama Anjum > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Cc: linux-parisc@vger.kernel.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-mm@kvack.org > Cc: linux-fsdevel@vger.kernel.org > > v2: > - Small fixups on the arm64 side > - Re-order patches in a way such that bisection is preserved > - Pick up Helge's patch dropping parisc ptep_get() > - Constify s390's ptep_get() as well > > Helge Deller (1): > parisc: Drop own implementations for ptep_get() and > ptep_test_and_clear_young() > > Pedro Falcato (5): > mm/arm64: constify pte_get*() and contpte get logic > mm/powerpc/8xx: constify ptep_get() argument > mm/s390: constify ptep_get() argument > mm: constify generic pte_get*() > mm: constify the pte_offset_map_ro_nolock() return value > > arch/arm64/include/asm/pgtable.h | 10 +++++----- > arch/arm64/mm/contpte.c | 11 ++++++++--- > arch/parisc/include/asm/pgtable.h | 20 -------------------- > arch/powerpc/include/asm/nohash/32/pte-8xx.h | 2 +- > arch/powerpc/mm/pgtable.c | 2 +- > arch/s390/include/asm/pgtable.h | 2 +- > include/linux/mm.h | 4 ++-- > include/linux/pgtable.h | 8 ++++---- > mm/filemap.c | 2 +- > mm/khugepaged.c | 2 +- > mm/pgtable-generic.c | 4 ++-- > 11 files changed, 26 insertions(+), 41 deletions(-) > -- Thanks, Usama