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[2003:cb:c739:bb00:201f:378f:5564:caeb]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-427f93aabdasm14034325e9.36.2024.07.23.23.27.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 Jul 2024 23:27:42 -0700 (PDT) Message-ID: <51bef112-67b5-48bb-a855-45ad25e05ecd@redhat.com> Date: Wed, 24 Jul 2024 08:27:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: fix maxnode for mbind(), set_mempolicy() and migrate_pages() To: Jerome Glisse Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Andi Kleen References: <20240720173543.897972-1-jglisse@google.com> <0c390494-e6ba-4cde-aace-cd726f2409a1@redhat.com> <6be6453a-15ce-4305-9a7c-a66e57564785@redhat.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 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-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 6F9C7140021 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: xermec8d45pjw9aftzznhte8g7oki5fc X-HE-Tag: 1721802466-242719 X-HE-Meta: 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 81hhxYyR q9V2WljKtX0ZFprQjDcJfuXJuKhUk5uflfg1ubggLdeL4aVr++5F2d4sFzYPXTp2Sq3G5MlsGo4KGDBvBXK3KbS/dsZcrjtiJWy1U8IUCaqhHIbgAv819cUaRKUGbIlAlIAumHi4wDOaf8WylKA5jJQPCAXfEg6W1E6tsL9q9EVWUdLfis8/HPMSeLe6er0ErnFqD6hDJwsGDVErq1jWt5B09eNuaZQugJ1LBcGi2Q/hww4gcONyxZ2vF22mHkn3SHKFU4WniBKh6oUdBQcRqi7RVJoxJNBNSlXY7z8dttn6/x0Ez7Kz2qCq8UnvbjZUKVZk+DOphzBiszmrQs3YY1JQZmmk2SKpfHURksNczVoC3rT85WjJxvea/7BHK1sLRC2Cxyi5Pv7pWeost27FyL/O4HD3XybJGFSv6 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: >> In any case, we have to document that behavior that existed since the >> very beginning. Because it would be even *worse* if someone would >> develop against a new kernel and would get a bunch of bug reports when >> running on literally every old kernel out there :) >> >> So my best guess is that long-term it will create more issues when we >> change the behavior ... but in any case we have to update the man pages. > > No it would not, if you had the fix and did not modify applications > that are smart about it then nothing would change. Applications that > are smart will work the same on both patched and unpatched kernels > while applications that have the bug will suddenly have the behaviour > they would have expected from the documentation. See my other mail, this seems to be the expected behavior since the very beginning. So unless I am missing something important, the only thing to fix here is the documentation. -- Cheers, David / dhildenb