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[2003:cb:c721:7400:ab0b:9ceb:d2:6a17]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3912c103290sm4461424f8f.87.2025.03.07.00.10.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 07 Mar 2025 00:10:54 -0800 (PST) Message-ID: <264e859c-820f-4001-b5b7-d4011fcbc192@redhat.com> Date: Fri, 7 Mar 2025 09:10:53 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] mm: page_ext: add an iteration API for page extensions To: Luiz Capitulino , linux-kernel@vger.kernel.org, linux-mm@kvack.org, yuzhao@google.com, pasha.tatashin@soleen.com Cc: akpm@linux-foundation.org, hannes@cmpxchg.org, muchun.song@linux.dev References: 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: I7FAtrcF6FDZLk3OqGwwY9aMMxm1qaHImfoRx8LAn3U_1741335055 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: g3tqmthknxp1i8x1oqd8cxr5qqm85cyi X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: E3A76C0002 X-Rspam-User: X-HE-Tag: 1741335058-284394 X-HE-Meta: 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 F/cj+7xH Flrnd3b1k/SG45rIT448GrlEWOvT/Vw7IJA7xqb8QdPEGOn9SADqCeshZPhiDrsfXRW5JEl/O908m7VQEvs9ecc2ga3Xg+SC2OVLbNDtBaUwP9wb8yC4F/htxdngpiYZaxKNgO1oTiyBN/ONcMazzlF2DIfeGJ9Qn+jKJFuLouS4FCNSaOC/zXnhR/Jq8CPK/rFpp8U4enX112WJ9y6SZknsm/GmSlOlkmKVgnXXrFoNAdUNgFXhY3y0a4hqnaq5PTNA1CUcA9d8AxVkQWcJKjAXeZTbbgt/SCJ8/Wq/PFjJd6mSAihLgaNs4xo4b/ipnnWZPN9Qp2rD03UNHely7xowbmh/Mhr2I0Ckjxp1UBcDwH0xSI04REqCP2GbtvWrnIIfCNR1VvW09OMO+t6iKtZ5i4a9HbL7YlSZA99pF5i4Ce4MBjeLJtQcBZIBDRmKyoUta5xMsT97cXNdPwNT5ni6k8A== 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: > +++ b/mm/page_ext.c > @@ -507,6 +507,19 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat) > > #endif > > +/** > + * page_ext_lookup() - Lookup a page extension for a PFN. > + * @pfn: PFN of the page we're interested in. > + * > + * Must be called with RCU read lock taken and @pfn must be valid. > + * > + * Return: NULL if no page_ext exists for this page. > + */ > +struct page_ext *page_ext_lookup(unsigned long pfn) > +{ > + return lookup_page_ext(pfn_to_page(pfn)); > +} > + > /** > * page_ext_get() - Get the extended information for a page. > * @page: The page we're interested in. As discussed offline, getting rid of lookup_page_ext() can be done later as a cleanup. Acked-by: David Hildenbrand -- Cheers, David / dhildenb