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[2003:cb:c70d:3a00:d73c:6a8:ca9f:1df7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38a28f17315sm48324196f8f.108.2025.01.08.13.12.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Jan 2025 13:12:37 -0800 (PST) Message-ID: <34ad8349-c4c3-4370-a662-324fa91b32b1@redhat.com> Date: Wed, 8 Jan 2025 22:12:36 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 3/3] fb_defio: do not use deprecated page->mapping, index fields To: Matthew Wilcox Cc: Lorenzo Stoakes , Andrew Morton , Jaya Kumar , Simona Vetter , Helge Deller , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <1e452b5b65f15a9a5d0c2ed3f5f812fdd1367603.1736352361.git.lorenzo.stoakes@oracle.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-MFC-PROC-ID: AHD0YeOYW5ixO7WfT4ZimYTjqrruypLgRjpaibZM3YY_1736370760 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: 4D7F740006 X-Stat-Signature: r69t99sekuqm9xb7o78smbjhjk5rfxed X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1736370763-109566 X-HE-Meta: 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 M/iviYDm DGoZSvAWxW11BsveQsYQTAx1PjzC6JCzPkj/uoE6cACWkC60rQ9b0GluTc+Ke8marN/ltTQ+QtITvz4VEAbQoeBexc90xPIClB2/rj2qzYJbBeI8ZAVZQQ+/HbDvj30EXE1S5ddJ/Q/0aNlrYBhcy4pyRBgAGQGJWD1LLJrDLVwzsGg40lT2444YfsKqUDbI+aPPoLDgzRYFmPE0YO4+6Sz1uziBYz6W6nPvGmAovcrDMyxL/e37hg3qEGPTXm4r44S+Sm+QcsDAWwPtly+Zt1BOmSRUYnlCTQ2DEN69ZG0FhtO7btsIDJoOzMCXA1IXeq5Ni3Xhn+XmiQpgHRLzZQ29jApUsAdK6wDpWEwR5yN563U2ZPJU1U98uY5ceJhvsFk/acsw02ZSyOMAsqtHvZRRu18SFZezevibgKZstDNIJowrNdRhKiP9i+zc+ILM0cwOS X-Bogosity: Ham, tests=bogofilter, spamicity=0.000013, 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 08.01.25 21:54, Matthew Wilcox wrote: > On Wed, Jan 08, 2025 at 09:14:53PM +0100, David Hildenbrand wrote: >> On 08.01.25 18:32, Matthew Wilcox wrote: >>> On Wed, Jan 08, 2025 at 04:18:42PM +0000, Lorenzo Stoakes wrote: >>>> @@ -280,7 +269,10 @@ static void fb_deferred_io_work(struct work_struct *work) >>>> struct folio *folio = page_folio(pageref->page); >>>> folio_lock(folio); >>>> - folio_mkclean(folio); >>>> + rmap_wrprotect_file_page(fbdefio->mapping, >>>> + pageref->offset >> PAGE_SHIFT, >>>> + compound_nr(pageref->page), >>>> + page_to_pfn(pageref->page)); >>>> folio_unlock(folio); >>> >>> Why do we need to lock the folio? (since this isn't necessarily a >>> folio) >> >> Can you clarify the "since this isn't necessarily a folio" part ? Do you >> mean in the future, when we split "struct page" and "struct folio"? > > Right. I need to finish the email that explains where I think we're > going in 2025 ... > >> Doing an rmap walk on something that won't be a folio is ... sounds odd >> (->wrong :) ) > > Not necessarily! We already do that (since 2022) for DAX (see > 6a8e0596f004). rmap lets you find every place that a given range > of a file is mapped into user address spaces; but that file might be a > device file, and so it's not just pagecache but also (in this case) > fb memory, and whatever else device drivers decide to mmap. Yes, that part I remember. I thought we would be passing in a page into rmap_wrprotect_file_page(), and was wondering what we would do to "struct page" that won't be a folio in there. Probably, because the "_page" in rmap_wrprotect_file_page() is misleading :) ... should it be "file_range" ? (but we also pass the pfn ... ) -- Cheers, David / dhildenb