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Howlett" Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-kernel@vger.kernel.org, kernel-team@meta.com, Lance Yang References: <20260511-ecc_panic-v6-0-183012ba7d4b@debian.org> <20260511-ecc_panic-v6-2-183012ba7d4b@debian.org> 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: <20260511-ecc_panic-v6-2-183012ba7d4b@debian.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: AF07B140006 X-Rspamd-Server: rspam06 X-Stat-Signature: khks7uajps3oxi7fm3uj89fncexztzeq X-HE-Tag: 1778574117-459134 X-HE-Meta: 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 8YovDZBY Uck7zxfG8+IcrrGv6F2Midf0ZguumlhAKoycjvr7ulILpprDHcQHtYyGz/lJz6cM5s+SGqAwQuk25Qw0ofUbI8pJbLgODNxcJZq5MUNdFi9D7GITxKvP0At7z/2tWQR8QvCb8sFKW9ZVDBVrvLaJBJPw8FVi5INOA6MBeJQ1w4uCfxWBAnMqV7er5U50R+Ntsn6hV6M9TeU8UNQclznbknTdMTNY9/GenSQBKy9Lg2A9wgXP3sJF9sQzMVW7StckJR/bmWnQotgPL5RsWWhuAZXDUuiusgirSe8+XJIhSejDcSdA6dgFaMgIide3ZW3dd5V1UsqPsMThNCS1OfEPKvSV/IoyS+yzelN0KEma3g+vvpbUB7Yp1m6So3kvyqad4bvlRZ0NFdqGkcCyiolsaIs5TRKJDYJyRVW1w Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > } > goto unlock_mutex; > } else if (res < 0) { > - if (is_reserved) > + /* > + * Promote a stable unhandlable kernel page diagnosed by > + * get_hwpoison_page() to MF_MSG_KERNEL alongside reserved > + * pages; transient lifecycle races stay as MF_MSG_GET_HWPOISON. > + */ > + if (is_reserved || gp_status == MF_GET_PAGE_UNHANDLABLE) > res = action_result(pfn, MF_MSG_KERNEL, MF_IGNORED); It's all a bit of a mess. get_hwpoison_page() should just indicate that a page is unhandable if it is PG_reserved? Why can't we just return a special error code from get_hwpoison_page()? We ahve plenty of errno values to chose from. -- Cheers, David