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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b575736f1sm149280645e9.13.2025.08.26.05.52.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 26 Aug 2025 05:52:42 -0700 (PDT) Message-ID: Date: Tue, 26 Aug 2025 14:52:40 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 06/10] mm: update coredump logic to correctly use bitmap mm flags To: Lorenzo Stoakes , Andrew Morton Cc: Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , "David S . Miller" , Andreas Larsson , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , Alexander Viro , Christian Brauner , Jan Kara , Kees Cook , Zi Yan , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Xu Xin , Chengming Zhou , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , David Rientjes , Shakeel Butt , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Masami Hiramatsu , Oleg Nesterov , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Jason Gunthorpe , John Hubbard , Peter Xu , Jann Horn , Pedro Falcato , Matthew Wilcox , Mateusz Guzik , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org References: <2a5075f7e3c5b367d988178c79a3063d12ee53a9.1755012943.git.lorenzo.stoakes@oracle.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+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: <2a5075f7e3c5b367d988178c79a3063d12ee53a9.1755012943.git.lorenzo.stoakes@oracle.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: VeCJU7x7p9QEmYmNuCQClDr8wnySUzWFcXpb130hocg_1756212764 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 83794C0002 X-Stat-Signature: ddqftm1reaod3wbmy8yin1qsng7qphpp X-HE-Tag: 1756212766-905545 X-HE-Meta: U2FsdGVkX18PknkswtzsEUUy3c2ZRnzfwaAWNMIMVfJ1snhn5rt9ygb54+7MMG3awj4DX5Hsj3CzEc3tSdtDWCGJ3M+gaU2faWq7W73TgeNJpG8gwFSAhfPyQkNdHMeqsh3Ab1njQ/fw5vQzjJZQ7T24oZyu7/TdGTY7VTKZ0av6djo1SuFFZgKu55NauzjpnIRBr8FkMcJUqD4vlaD5pixQWfiQ/QstkjeiWNXArMTX2jwVi7kaa2YiG2fazTT6yorl8z/p8eP/1fuX7R2KelQrcahqmoUANKbyl6XfMlmLVS9q9FY2A/UHj5n0ZhF72aLJjf5d7GuDCWNHiJSjzLDnoJamIZmn/K93wU6tLX0FDwatKcOK/KUWrcdmDsuZ7VbNMCxkQFtgj939H6PwmNO2UMJEhgR9Odh5DPY9UTGWO2/cudww3z4F8mIAwizmTCr3yQ01BLQYoveeOBY4GWZOPQnwHK7nJ3kZ/8rlLAMKbev0b0sjnMon8ZmULKbdmgQNUarTWILbpEI49crQNPURPHnbeomLLM/QK+R92QKOHjR1LlNWTYZujHvliVA/7t5S45IUNQySvYl7TiHiW8ADM4qgsj9cfkS+qqJOzjFWlHULJLirhrllD+IRRCz8Mnk/fGVkM1xQh7AyupugHMQSY4GF3DqQdgjMlfJoRSTozmUUX5bYNhRB9k3lwTb4fa2fpTLOr2SIXn7GMv+0Jgg16CG1TELAACz/tS9fTpEfukZr63zpsfjJyoBkzXLpHv8pZyxgzkYlN2qqtXGFD5Yxmg4UU3OJMaeBmD3yZsl2OjyXAo8WNfqGp+h6baLR40EUM5iUDqQ8izaYn5ZOxDfHN7Pdn3zH7g1JMMI0qhvTngLVHyb+TcAC+x6a8v75szjvSNXBd0DYh8DZ8ddiWwFHLPBim1qV8+7KD6ur67Pn89jzYTFVIjvIvRNKr3hknlysIW4CDL/BxMZK0Ly 7LPS9IA/ CH7GRnvWQTEC/XfC87iisSDcaV/9fV1Slk1KtEspPvEiW6VuiUPd0Im9j8HNnLc5rYlsmW3LTkEwBl4nbqR8iV5qduRjW1qy+DwPVTp21QRONGAq5nWXbKUhjeF1bOyoYRcbfoSg5VBOcAQFkJ3dj8CycbBuhRe2OaBNbWBXhaftj8wmtPPIlxECOT0kS1ApLPqVT1DslKY6bn77E6rJDwMCXTkwzTPKoxOXyQq2I6FORD/PR8X+XDvGsJ9+WlUz4i5J50gLLLJappD+mqf1663j4K0gyWEsD1TqwNguF3c6DUhXqE0NnoWntY/XWmJCi5Q8GN1LQ7m6+sPLiNmutOMCP50isBrNOigFTOAmRS8McySQ2ELzRzr9WRjc6Jso7FAPBRob1Aft8pIuPMEberUNoMKLZE+cUb3IHfRLosu3Ag2pe+48dX87mB1kLbICjnJ9LhEeU408p5qbRltsl2ekZpA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 12.08.25 17:44, Lorenzo Stoakes wrote: > The coredump logic is slightly different from other users in that it both > stores mm flags and additionally sets and gets using masks. > > Since the MMF_DUMPABLE_* flags must remain as they are for uABI reasons, > and of course these are within the first 32-bits of the flags, it is > reasonable to provide access to these in the same fashion so this logic can > all still keep working as it has been. > > Therefore, introduce coredump-specific helpers __mm_flags_get_dumpable() > and __mm_flags_set_mask_dumpable() for this purpose, and update all core > dump users of mm flags to use these. > > Signed-off-by: Lorenzo Stoakes > --- Incl. fixup LGTM Acked-by: David Hildenbrand -- Cheers David / dhildenb