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b=Dkt6xH2JXFEogH+25ymBukI9dCfxA3hNo12nOX8K2n5a6a4QY62Q+ke8no/A5HEVB qZ/L/nhs6YtNxqoHfgLG/Sf2dgwVZrYX0LSF4B9KXmr+XJcClAUwyIu5ELJKVvR+s8 n/2gaj3xYxQWF8eiji3ZzJMe9XyxijisYWdV6bSTlX7mWI7PrQOY+SkCFPa3Ya5Xhl Cp9NLzhGBwux1m6QmGi1Wd1JYxXgtzvHpZnD4pjRp59Mo9zpbYS6NBLwVZLIyEl71R fp/89MDqsFlPFFStUrxWH+ltvJYMqlt9WzAZ4YlEs5MMHdOMEHPBy24QJ6zAyFygMI PGgXai9Hc1Zxw== Message-ID: <655c509e-318f-48bc-8183-2b1274dd05ac@kernel.org> Date: Mon, 28 Sep 2026 09:28:08 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 10/13] mm/sparse: remove SECTION_MARKED_PRESENT To: David Carlier Cc: akpm@linux-foundation.org, axelrasmussen@google.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, baoquan.he@linux.dev, brendan.jackman@linux.dev, dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, hannes@cmpxchg.org, jan.kiszka@siemens.com, kasong@tencent.com, kbingham@kernel.org, liam@infradead.org, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, mhocko@suse.com, osalvador@suse.de, qi.zheng@linux.dev, rafael@kernel.org, rppt@kernel.org, shakeel.butt@linux.dev, surenb@google.com, vbabka@kernel.org, weixugc@google.com, yuanchu@google.com, ziy@nvidia.com, devel@lists.crash-utility.osci.io References: <20260921-b4-sparsemem_cleanups-v2-10-54d81d65e125@kernel.org> <20260927192013.144672-1-devnexen@gmail.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: <20260927192013.144672-1-devnexen@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 0BF9440007 X-Stat-Signature: f9yefhk76j4pxbz7f6ci8cgr3rcz1i39 X-Rspam-User: X-HE-Tag: 1790580502-824043 X-HE-Meta: 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 MXWvgNA7 sF8hZM8oGRHgV0hdhoi8CxubDjpaVLdaUf7ycQO5UPzy4S/Bar6v6vzfFHVltfeiTOm7Mt8o5pEU6mg7m8t/4KhpTzmif2ArTInfajIPl8hEnL4+CPuUh0BZcsHN6s52gxsX1xqN/XfamuoE3rVTlDeZ/0ZJ1mbDoYj8GZMl14LhrcqbhyehCAczP2P6jv1hbvhZzmuAGQ0rfa8JqwBI027R2RubrwrKVKcCzE8bveAYJnveNGE7juBQGZ7P4MV2UWTYOKYLSBQsYU5TPFJeFEAp8By/jyAqwgLm/Al/kEgzSq7vLTJjfAhfWkF7CMpy2IY+hTyW8yLIrixY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/27/26 21:20, David Carlier wrote: > On Mon, Sep 21, 2026 at 09:59:02PM +0200, David Hildenbrand (Arm) wrote: >> enum { >> - SECTION_MARKED_PRESENT_BIT, >> SECTION_HAS_MEM_MAP_BIT, >> SECTION_IS_ONLINE_BIT, >> SECTION_IS_EARLY_BIT, > > Hi David, Hi! > > It seems dropping SECTION_MARKED_PRESENT_BIT shifts the other section flags down > one bit. crash hardcodes SECTION_HAS_MEM_MAP as (1UL << 1) in > pfn_to_map(), so it now tests SECTION_IS_ONLINE: offline and > ZONE_DEVICE sections no longer resolve to a struct page. makedumpfile > only checks bit 0 and is fine. Thanks. To be expected when relying on kernel internals. Which makes me wonder why makedumpfile (https://github.com/makedumpfile/makedumpfile) not require any such information. > > Keep bit 0 reserved, or export the bits via vmcoreinfo? We could export it, or crash can simply detect the change based on the kernel version. I remember the latter was done in makedumpfile in the past (although we export it). I can send a separate patch to export it. -- Cheers, David