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[80.187.83.189]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-426ce5cfe4esm352054f8f.26.2025.10.09.12.03.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Oct 2025 12:03:33 -0700 (PDT) Message-ID: Date: Thu, 9 Oct 2025 21:03:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/4] mm/memory_hotplug: Remove MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers To: Sumanth Korikkar , Andrew Morton , linux-mm Cc: LKML , linux-s390 , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev References: <20251009131839.3739108-1-sumanthk@linux.ibm.com> <20251009131839.3739108-5-sumanthk@linux.ibm.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: <20251009131839.3739108-5-sumanthk@linux.ibm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: UFiqLEcj2UWbXMAImL2M3XdDuAy991ic65bZjv5IyQw_1760036615 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: rspam10 X-Rspamd-Queue-Id: F2A2D4000D X-Stat-Signature: 3a1suhi7ab3uhr1pawg3zmnhs6ezpj7b X-Rspam-User: X-HE-Tag: 1760036617-391591 X-HE-Meta: U2FsdGVkX19eBU6yCPesAzIo7onvgcHMs/vIrh9qo7kumzpnXCkhHRgz07Rc/k25jDcEnJFZtwxyM02dDOmrtpkUv+W05VbHs83um88J94tMVKhgGwFnnBwaRZVmfC0Z3epOUQ0CseAAe0idCvMifnS6AgShZH7b2eyyZlwWJci/bL7mJH6QOUXNvDWWfFLFUAZAh1n3sN1Z3qwm2SnVW1yWBwupE+dIhAIqA8/cnOTRdnfiwiRzjdaU9GhEUdllvK+/bPl2UH1NaIw8sn+KJU2MQLfNRQThJkaZfawoB6s4CMlm94EVv4GEAd7/Uodv5Vs0qUajv6Twv2d7Cgf5NwIIxDgpTaReGWiwfYMDikl7qqcV4NYHs7jxvrYa6715Veu2UYjh8XqLvJhYBO2kVVmSE0a8CMczcfgplQ/C6AsMJj2+iNBXTfBnetDfIhqH0eeBe589A0VXJMBkPQ/+gh5FQylp3nR7gPQIuytx0zqh5rrx3oAAujiR3tUKQxEsbjLUQZlEQKNnWdUt6DQsDI8BzzsxeQJgB5XRyLvsxLk6WIrXHXz/eUNEnhiuLbm3cp7GoJbuEGj2kgkFNdu5h2v+p2OMqsjCfNyX2kxjmI1FNOVj4wZf31eiq4xzfdPpHMMRWx0s7XQKpXuWFmDOuSJ9cZdkKp4xxZ+Lue4Q8dGemDOrV2hKONqmbCp7wMPjKeZIxcJYj6KrtMnAjZfegICnUEhdEy8bG0fGf+VuX2N5d9oPWQhQ2TE2xG6VtXZXlnfxBSfwGzXkCXhXKRMlSbFbb4rxq9h7A8Xhy+rmURiBPEaiG3ANzK9Y39JJ/k0ztBscdvjI8TqHT6faJ0Tha2AHVA5v3LEzp58zZyRIyGrEFnPMLYf5jnFvlOKMde/AI6Kq+LI9sFWk1tP5wAPWpPYjePSo7m+5lgh+LdSXvPhgUIGtu2Dy1pGOqU8ghhTvE6OMCFd2oisU/gCMgc6 psqzY3bV 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 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 09.10.25 15:18, Sumanth Korikkar wrote: > MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE memory notifiers were introduced > to prepare the transition of memory to and from a physically accessible > state. This enhancement was crucial for implementing the "memmap on memory" > feature for s390. > > With introduction of dynamic (de)configuration of hotpluggable memory, > memory can be brought to accessible state before add_memory(). Memory > can be brought to inaccessible state before remove_memory(). Hence, > there is no need of MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE memory > notifiers anymore. > > This basically reverts commit > c5f1e2d18909 ("mm/memory_hotplug: introduce MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers") > Additionally, apply minor adjustments to the function parameters of > move_pfn_range_to_zone() and mhp_supports_memmap_on_memory() to ensure > compatibility with the latest branch. > > Signed-off-by: Sumanth Korikkar > --- Acked-by: David Hildenbrand -- Cheers David / dhildenb