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b=Yp/N+AHAHv1CMk1qBXpZpVH1KLgND3ckyHFUGOaT5Y8KSi41RE5twx/rLgl1lWRJZ jQKCIbUB8AR3Zdi9riA/kGtRBCAIVgHpXCSVPEl7PNhBE571EoL5+tfc7uVDLbDCvB qEtObc4ptSrmviPlkEuJ8JbqeNPbca1p9OBZj3vbErKmgigKyuB+49gZ7FZU0UxnPU KBp/kduAFisTHska70iXJD0wOaN+z7RIerquCDHbzyJbfb1RjHWTcBLrsuF1EXAF75 0cNuVVYUo/ZQ2wUyHw0uQxz5lC6CA0NQw+vwk/RLG4mv2Mh/FGRte62WNRchbg0Rn2 pfsfNnnwbU5LQ== Message-ID: <7b4b4543-a614-46a3-87b8-dcb1988f4332@kernel.org> Date: Fri, 27 Feb 2026 21:50:50 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: Replace READ_ONCE() in pud_trans_unstable() To: Anshuman Khandual , linux-mm@kvack.org Cc: Andrew Morton , Lorenzo Stoakes , Mike Rapoport , linux-kernel@vger.kernel.org References: <20260227040300.2091901-1-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: <20260227040300.2091901-1-anshuman.khandual@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: C4CCC4000F X-Rspamd-Server: rspam08 X-Stat-Signature: pqz6wbh6urx8ct63z879oa4zgbm1xeoq X-HE-Tag: 1772225454-648443 X-HE-Meta: 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 yKknjrJh 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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 2/27/26 05:03, Anshuman Khandual wrote: > Replace READ_ONCE() with the existing standard page table accessor for PUD > aka pudp_get() in pud_trans_unstable(). This does not create any functional > change for platforms that do not override pudp_get(), which still defaults > to READ_ONCE(). > > Cc: Andrew Morton > Cc: David Hildenbrand > Cc: Lorenzo Stoakes > Cc: Mike Rapoport > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David