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Fri, 21 Nov 2025 17:58:42 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id +ExXE1KoIGmOYQAAD6G6ig (envelope-from ); Fri, 21 Nov 2025 17:58:42 +0000 Message-ID: <38461f6f-6e47-49b1-90b6-1649dc39d5cc@suse.cz> Date: Fri, 21 Nov 2025 18:58:41 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 09/16] mm/huge_memory: refactor change_huge_pmd() non-present logic Content-Language: en-US To: Lorenzo Stoakes , Andrew Morton Cc: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , David Hildenbrand , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Sven Schnelle , Peter Xu , Alexander Viro , Christian Brauner , Jan Kara , Arnd Bergmann , Zi Yan , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Muchun Song , Oscar Salvador , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Axel Rasmussen , Yuanchu Xie , Wei Xu , Kemeng Shi , Kairui Song , Nhat Pham , Baoquan He , Chris Li , SeongJae Park , Matthew Wilcox , Jason Gunthorpe , Leon Romanovsky , Xu Xin , Chengming Zhou , Jann Horn , Miaohe Lin , Naoya Horiguchi , Pedro Falcato , Pasha Tatashin , Rik van Riel , Harry Yoo , Hugh Dickins , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, damon@lists.linux.dev References: <451b85636ad711e307fdfbff19af699fdab4d05f.1762812360.git.lorenzo.stoakes@oracle.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <451b85636ad711e307fdfbff19af699fdab4d05f.1762812360.git.lorenzo.stoakes@oracle.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 075C24000F X-Stat-Signature: m3qsq3mmaeff3gt3gd1rkxjs4ipt8q56 X-Rspam-User: X-HE-Tag: 1763747924-532177 X-HE-Meta: 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 xl7uQECF elJ6L3FNbH3Ba2Wkb15ISpEqWVl1oQYB6cE7UuXTD9Ugfi18dlhtymVvZo4ZzyO1SvSk7T6N8JR1JeGCIgQWz+dahRpbDgdCCzfVNoql6zcwQINnrZhc8HmPgOdTTa2o9SzJuX73k3AkhnTy+QpMe2tPKjE75n8ES8v3THXpQS7q7A6+of+fezsVvI6SJ0v+1BRxQhrk91q3N3N4NUKL/GnBtt4SGBt5yOMaQW7lB7/ILcC+s5ibxG+vdgGuTUn2cifPUbEdx8C9YDHhIN3m9pnfEldCmqJGL/4BUapyrhY0oIIFBXhdvt+YnO3dyog/GKdaHoIcKp7CLia2A7VRI1mh0cSP7QU9cfcOVGbLpLfG94xF3mFhsyO3NOc7KBQ29vUhYXR8ljwcV5xyI6NtVe55PmlYpgeLUMfwMFvo1VRInJWk= 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 11/10/25 23:21, Lorenzo Stoakes wrote: > Similar to copy_huge_pmd(), there is a large mass of open-coded logic for > the CONFIG_ARCH_ENABLE_THP_MIGRATION non-present entry case that does not > use thp_migration_supported() consistently. > > Resolve this by separating out this logic and introduce > change_non_present_huge_pmd(). > > No functional change intended. > > Signed-off-by: Lorenzo Stoakes Reviewed-by: Vlastimil Babka