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b=nTu4O9Akk0flvO6+BSylm5USeEJv58A8rGR5OVCC9K2+wRrwUjZOadfi5VUAT9pax XH0gBWs37n9FdBYhl1ydKUtQIsyREwo5qbrDXxCu/+bgunERXrJ2zDtu8i4bMSqrX0 4PT1ElyNznOFP0VQ7Rxnx5ET0DOnsrmzB/B12k9Vq5VADc2F59Z9QR3+67dAGH3CRl Dt1hpAB7ASIMZwFoTz7SgC82EF7FFN+66QYPUEmkSCrJ77Sdh0deMrbzAWk3LtdSiq e7edUxnQwQo66fxs1uJrEsST2+Keag1IlrdarBU9rbplgRNwDH41SM7WyEnLrmqoXK wTav+mb8/iibQ== Message-ID: Date: Wed, 8 Apr 2026 14:28:44 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC V1 11/16] arm64/mm: Route all pgtable atomics to central helpers 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: <20260224051153.3150613-1-anshuman.khandual@arm.com> <20260224051153.3150613-12-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: <20260224051153.3150613-12-anshuman.khandual@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: mrius769cii4satph5i1r694ak4ydn5m X-Rspamd-Queue-Id: 9EBB2C0009 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1775651328-945105 X-HE-Meta: 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 E7mHemzw TWaRhNxP+jgWTax4XSnYslhPBQnavgsnwa/+tNMl8Pdn1qO5Zyri1ZJZIr0w26WAwaPYd/EqxL19Oyl5Yu4gVBukvPqg4YWiGEUSfV5G7UmXD/LOSIS2eHWUHgdZ4gB1mklkPk2yLHBWh3obM7Clq/SaJwroUaIOrbW3+kl0rAKHcDqCW7YC/Q+GWNVOcws9zsZ+/argm8Vzt1rT2Io8MGB1SeSJQYC1tmu+avdDmJ3/Q849mTsiI9xDRXmb44sJEONOmIVAJdT3ZBxqHqNSRrGJqqc04uXBfgIvMkIWtFcdyo8o19E/PHqd5zsfr0BZMwCdN2TiELepRHTrIRdbumyZq+QRtkuyzz6ZbgRiRfSVg0NjKR3Ap0gQqz1WlyWa2EH2wj6blvoWKhgGTwjN8AaarFQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/24/26 06:11, Anshuman Khandual wrote: > Route all cmpxchg() operations performed on various page table entries to a > new ptdesc_cmpxchg_relaxed() helper. Similarly route all xchg() operations > performed on page table entries to a new ptdesc_xchg_relaxed() helper. > > Currently these helpers just forward to the same APIs that were previously > called direct, but in future we will change the routing for D128 which is > too long to use the standard APIs. > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Ryan Roberts > Cc: Mark Rutland > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual > --- > arch/arm64/include/asm/pgtable.h | 23 +++++++++++++++++------ > arch/arm64/mm/fault.c | 2 +- > 2 files changed, 18 insertions(+), 7 deletions(-) > > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index 42124d2f323d..cf69ce68f951 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h > @@ -87,6 +87,17 @@ static inline void arch_leave_lazy_mmu_mode(void) > #define ptdesc_get(x) READ_ONCE(x) > #define ptdesc_set(x, val) WRITE_ONCE(x, val) > > +static inline ptdesc_t ptdesc_cmpxchg_relaxed(ptdesc_t *ptep, ptdesc_t old, > + ptdesc_t new) > +{ > + return cmpxchg_relaxed(ptep, old, new); > +} > + > +static inline ptdesc_t ptdesc_xchg_relaxed(ptdesc_t *ptep, ptdesc_t new) > +{ > + return xchg_relaxed(ptep, new); > +} > + We really want the rename of ptdesc_t before this change. -- Cheers, David