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b=qub/xeCCPo256Fph96OpfyQeU70ix/6ePEohr72245giPZpEiYPcf2+pqx96eCK+X l0Qyo+sSHlX1A4IKkDcO5DL5d4xySSPX2mDHkowF+v/cV/IkBcho19ssz4qINHmQjH z0sAZtUh4k11djiRc6iwXt4IVTxy58WmrGoGXnVZYmKILvY3pkg7SVy6WWa1EMF9Gz isS8dbVkSi/Ku7j/8K62PkbBNlfpFOMqeTvwpiVmC4zmCY9UzWWwx6lW+w5aj/cWCD Toci5a+22SM4tE59wg9TuKJgRsyb/uRX2/FpEg4x7hmHz5HO/3CYWZGYLciN8JwqAB yXw23pVrlmq1Q== Message-ID: Date: Mon, 18 May 2026 10:20:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] Revert "mm: introduce a new page type for page pool in page type" To: Byungchul Park , akpm@linux-foundation.org Cc: kernel_team@skhynix.com, ast@kernel.org, daniel@iogearbox.net, davem@davemloft.net, kuba@kernel.org, hawk@kernel.org, john.fastabend@gmail.com, sdf@fomichev.me, saeedm@nvidia.com, leon@kernel.org, tariqt@nvidia.com, mbloch@nvidia.com, andrew+netdev@lunn.ch, edumazet@google.com, pabeni@redhat.com, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, horms@kernel.org, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, ilias.apalodimas@linaro.org, kas@kernel.org, willy@infradead.org, baolin.wang@linux.alibaba.com, asml.silence@gmail.com, toke@redhat.com, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20260515034701.17027-1-byungchul@sk.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: <20260515034701.17027-1-byungchul@sk.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 78B8110000B X-Stat-Signature: 5q3hbubx189nudm9fh3981m777pirars X-Rspam-User: X-HE-Tag: 1779092416-295225 X-HE-Meta: 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 JOJ9w1zY Hh1BvsxlGNHz05cHvmjBIQ+LbqCscGPlzM8SvO7iECi91fMKuGZ73nBYw45T/DMGjl8sNNQGdAU7ZSxA4DnPPwCCNVUcEiRgJqO7NC6FFnAnvSx8hjgl0WNSzbgzEFiTfEf5qb37GQSk2AtFFNEArhAM/2TuziCu485XyZq9SaiKoG9SW6EhTPHq2nZicIcKXwntS/63c/EDw6lE3MJrlGiTo6cdwO+my9IRK2XaLbFywMLEGDJOx4Y5e5y0vTCPMuBcWAEEj8J+7wx1lcVSkazIeIxKMuxH9aLJ05gaS0WWDJQsjDtPWMZ8czuovEWo8rTW1HvHV+gZFClMF5h7aelIlQzJRLs98PWe50CXgnU6p97YQdC7FHZXILeX/TgThsG8MeoRAYEJaWD6vgJA8Z/5f70/xtOfl8qQfmOXiI2fUlztjp3glYp0jMW6lBSxDCtIpAdU7xC1OVXIK4p2T/AfpEg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/15/26 05:47, Byungchul Park wrote: > This reverts commit db359fccf212e7fa3136e6edbed6228475646fd7. > > Netpp page_type'ed pages might be used in mapping so as to use > @_mapcount. However, since @page_type and @_mapcount are union'ed in > struct page, these two can't be used at the same time. Revert the > commit introducing page_type for Netpp for now. > > The patch will be retried once @page_type and @_mapcount get allowed to > be used at the same time. > > The revert also includes removal of @page_type initialization part > introduced by commit 735a309b4bfb9e ("net: add net_iov_init() and use it > to initialize ->page_type"), which will be restored on the retry. > > Reported-by: Dragos Tatulea > Closes: https://lore.kernel.org/all/982b9bc1-0a0a-4fc5-8e3a-3672db2b29a1@nvidia.com > Signed-off-by: Byungchul Park Too bad we didn't notice this earlier during testing in -next etc :( vm_insert_page() sucks. I hope we can revisit this, once vm_insert_page() no longer touches the mapcount. Acked-by: David Hildenbrand (Arm) -- Cheers, David