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(p200300d82f199c0005687df700e1293d.dip0.t-ipconnect.de. [2003:d8:2f19:9c00:568:7df7:e1:293d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a53229e009sm1789706f8f.16.2025.06.06.05.17.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 06 Jun 2025 05:17:37 -0700 (PDT) Message-ID: Date: Fri, 6 Jun 2025 14:17:36 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] mm/gup: remove (VM_)BUG_ONs To: Lorenzo Stoakes Cc: Michal Hocko , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Jason Gunthorpe , John Hubbard , Peter Xu References: <20250604140544.688711-1-david@redhat.com> <1a65d0e6-6088-4a15-9c19-537203fe655c@redhat.com> <50ff9149-2824-4e57-8d74-d8d0c063c87e@lucifer.local> <1a7513cf-4a0a-4e58-b20d-31c1370b760f@lucifer.local> 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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: HZJjaWPTLl5DXFJgaQrsTvrUTgQe8dYQRY6GZWUG6SQ_1749212258 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 19778160013 X-Stat-Signature: 4toc99maf1ppcsbizrgzn3fijstc8nwk X-Rspam-User: X-HE-Tag: 1749212260-614173 X-HE-Meta: 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 oCgrFf/8 VfAKQh15mRh335Lj20QXPrYCpWP4BRuN0kME0ziikvEWtHhiRiCNiL1jOYJeLSBFPUHrsMlUt9igYF6+5JDe9OWuNIzIz8eIt7HySjfuxB0H2qV5f2o7PJaaudWTrsSF7GAclGp5fRGz2GOm5OUWbvFcOrY4B9wPyYUZKF8uM9A2FvtrRly3VQoYoXypZc0KdELbe2h5jOLB26TFMm16MKWAAlb2mjjX9m4fJLBfcjUpcCJAz8E3B0/qaKHnWSJObma0gjMvKWMgybCFEg47byMP4maA+VEYy++bMV6QPZ2amqyMIE2TI4hEhjVPW2rnZ9bnKkKISU3C11xDBnRI5wxYwQJa3AXEHBeeK4SuVYX56OwcjhfZ0Kjg7nJNdVVxiXDHinnrlKvvqOCson+xc/E7wTuE/hlG9tOjN2yEo/1YjFonNXRVf2vyeaXLiAuD66duXdbTebMyRzt0= 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 06.06.25 14:12, Lorenzo Stoakes wrote: > On Fri, Jun 06, 2025 at 01:44:12PM +0200, David Hildenbrand wrote: > [snip] >> I assume with "this patch" you mean "a patch that gets rid of VM_BUG_ON >> completely", because I want this patch here (that started the discussion) to >> go in first. > > Yes, and sure. > > I can wait until this is merged upstream and take a look afterwards? Or base it on mm-new for now. I'm afraid there will be a lot of competing churn moving/reworking (or god forbid, adding) VM_BUG*, and not all goes through Andrew's tree ... so maybe doing stuff per subsystem might make it easier, not sure what will be best here. > >> >> Fascinating how you are always looking for work :P > > I mean I have an insane amount of work to do this cycle anyway... but the Call > of Churnthulu is loud to me ;) :D -- Cheers, David / dhildenb