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b=XZvbjTYhHMYYLm5eZryPH0+GXR5XNmEMgeQMCPy79tnA6n+P5f4CcDTyQnt4dJkto r+7dWlUrTZUruCEFkrdYRqfgrryNweCGyoS3uEbYCGDDYF12dPpKVfhxiyX0IKkc32 6sCF1bMHAl3m5tjQsau8dPeZdeT68CkcU+/ulfYl7AuORlXF5fmBX+WJH7wTSYtNKO FeYi5cxWeXWmzKF/Lmmr8NGPq15bxbtIY/8dmxDI8/s+tuMQ2VJ0MVB3S7slT258mA 7wteppWFHsnd2xoU9oBuTlOirIaGCLhQ3kXhHOPIcAiQyCd0UaP1JsRJ9WwQhVdQiK HyLMzG10qlNyw== Message-ID: <198df371-4599-4e71-814c-b94bddd41254@kernel.org> Date: Mon, 21 Sep 2026 16:46:56 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/4] arm64/mm: Convert pgtable READ_ONCE() as pxdp_get() To: Anshuman Khandual , linux-arm-kernel@lists.infradead.org Cc: Catalin Marinas , Will Deacon , Ryan Roberts , Mark Rutland , Lorenzo Stoakes , Andrew Morton , Mike Rapoport , Linu Cherian , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20260903060657.2717457-1-anshuman.khandual@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260903060657.2717457-1-anshuman.khandual@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: C6772C0005 X-Stat-Signature: srtkkjjogyxyeh7nf8awqemxhx7ypz7r X-Rspam-User: X-HE-Tag: 1790002024-695835 X-HE-Meta: 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 twLQopr/ 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/3/26 08:06, Anshuman Khandual wrote: > Route READ_ONCE() accesses on pgtable entries via level specific generic MM > pxdp_get() helpers which platforms could then override when required. These > accessors on arm64, will help in ensuring page table accesses are performed > in an atomic manner while reading 128 bit page table entries later. But for > now they just default to READ_ONCE(), thus preserving existing behaviour on > current D64 translation. > > This is similar to generic MM, where all atomic accesses have already been > converted from READ_ONCE() into pgtable level specific accessors. > > These are preparatory patches for D128 enablement, although standing their > own for D64 translation as well. These patches are split from earlier D128 > V1 series. There are no functional changes here, and besides mm kselftests > do not show any regression. > > https://lore.kernel.org/linux-mm/20260729122452.3797443-1-anshuman.khandual@arm.com/ > > This series applies on v3.7-rc1 but after applying the following patches > related to pgtable entry print standardization posted earlier. > > https://lore.kernel.org/linux-mm/20260831054331.625505-1-anshuman.khandual@arm.com/ > > https://lore.kernel.org/linux-mm/20260901065454.1906343-1-anshuman.khandual@arm.com/ > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Ryan Roberts > Cc: Mark Rutland > Cc: Lorenzo Stoakes > Cc: Andrew Morton > Cc: David Hildenbrand > Cc: Mike Rapoport > Cc: Linu Cherian > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Cc: linux-mm@kvack.org > > Anshuman Khandual (4): > arm64/mm: Convert READ_ONCE() as pmdp_get() while accessing PMD > arm64/mm: Convert READ_ONCE() as pudp_get() while accessing PUD > arm64/mm: Convert READ_ONCE() as p4dp_get() while accessing P4D > arm64/mm: Convert READ_ONCE() as pgdp_get() while accessing PGD > > arch/arm64/include/asm/pgtable.h | 6 ++-- > arch/arm64/mm/fault.c | 8 ++--- > arch/arm64/mm/fixmap.c | 6 ++-- > arch/arm64/mm/hugetlbpage.c | 10 +++--- > arch/arm64/mm/kasan_init.c | 18 +++++----- > arch/arm64/mm/mmu.c | 60 ++++++++++++++++---------------- > arch/arm64/mm/pageattr.c | 8 ++--- > arch/arm64/mm/trans_pgd.c | 14 ++++---- > 8 files changed, 66 insertions(+), 64 deletions(-) Skimmed the changes, purely mechanical changes, so looks good. Consider spelling out in the patches "No functional change intended." -- Cheers, David