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(p200300cbc71bd0001d1f238eaeafdbf7.dip0.t-ipconnect.de. [2003:cb:c71b:d000:1d1f:238e:aeaf:dbf7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3861fd46cdesm4239800f8f.57.2024.12.06.02.29.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 06 Dec 2024 02:29:39 -0800 (PST) Message-ID: <393a1314-79b4-421a-ae45-f33c1bb600f8@redhat.com> Date: Fri, 6 Dec 2024 11:29:37 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 02/17] mm: factor out large folio handling from folio_nr_pages() into folio_large_nr_pages() To: "Kirill A. Shutemov" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, x86@kernel.org, linux-fsdevel@vger.kernel.org, Andrew Morton , "Matthew Wilcox (Oracle)" , Tejun Heo , Zefan Li , Johannes Weiner , =?UTF-8?Q?Michal_Koutn=C3=BD?= , Jonathan Corbet , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen References: <20240829165627.2256514-1-david@redhat.com> <20240829165627.2256514-3-david@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-MFC-PROC-ID: RcokFX0AgFjAte-d4IV0zAsGAmQtkBDxU6v8g9rot2c_1733480981 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: rspam02 X-Rspamd-Queue-Id: A8F854000D X-Stat-Signature: a77f9g96hjau6awre9y4cdz16kezh8s8 X-Rspam-User: X-HE-Tag: 1733480964-213303 X-HE-Meta: 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 eUr6WqR6 cu8Peca45Jsez/Z3io6SJqIOeG3dcFcOwHnqyft11JW68rWpdD0Ped3G5G0p9vIG539rSa5BTJB2879jRdkj5ej51++0MSiKeZ1omajQieWvdOQ5EePBabyt+ycj1ZxRmhRAe6xNVX8OWfYcASQYabh05+1PKUhxWI+KuONJYJ9jcLvu0P6g2EO5HEevPGPW2d6m4K0Q/DFa2sXV8BPt4P/wBMHO+a2zeDIbL5jeKBz7mqquotwF1hvH+renhga5a68tGrffemK0V5kzk0xMMkUbWOd9X2Q60UhXsCR7FezvkZQcmSkaZQUw2az0gA7YiysAkUQ58PT/PgBfhhwR2gFwfKEmhtaVlorkwFY0oC7BSOyBZjFumz0HL0qI0RURq5XRHcuc+Ci3N15eU9+o1FxHKSN8rpAP9eSVcuH21rLzrNYOYrYTbCd1fOEnZQhSA8xPbZQ9ZhtC6KM1QzpWwfDse0w== 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 23.10.24 13:18, Kirill A. Shutemov wrote: > On Thu, Aug 29, 2024 at 06:56:05PM +0200, David Hildenbrand wrote: >> Let's factor it out into a simple helper function. This helper will >> also come in handy when working with code where we know that our >> folio is large. >> >> Make use of it in internal.h and mm.h, where applicable. >> >> While at it, let's consistently return a "long" value from all these >> similar functions. Note that we cannot use "unsigned int" (even though >> _folio_nr_pages is of that type), because it would break some callers >> that do stuff like "-folio_nr_pages()". Both "int" or "unsigned long" >> would work as well. >> >> Signed-off-by: David Hildenbrand >> --- >> include/linux/mm.h | 27 ++++++++++++++------------- >> mm/internal.h | 2 +- >> 2 files changed, 15 insertions(+), 14 deletions(-) >> >> diff --git a/include/linux/mm.h b/include/linux/mm.h >> index 3c6270f87bdc3..fa8b6ce54235c 100644 >> --- a/include/linux/mm.h >> +++ b/include/linux/mm.h >> @@ -1076,6 +1076,15 @@ static inline unsigned int folio_large_order(const struct folio *folio) >> return folio->_flags_1 & 0xff; >> } >> >> +static inline long folio_large_nr_pages(const struct folio *folio) >> +{ >> +#ifdef CONFIG_64BIT >> + return folio->_folio_nr_pages; >> +#else >> + return 1L << folio_large_order(folio); >> +#endif >> +} >> + > > Maybe it would be cleaner to move #ifdef outside of the function? Yes, can do that. -- Cheers, David / dhildenb