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[91.12.98.205]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4406d5accc2sm162941515e9.14.2025.04.22.00.00.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 22 Apr 2025 00:00:55 -0700 (PDT) Message-ID: Date: Tue, 22 Apr 2025 09:00:54 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RESEND PATCH v2 1/1] mm/rmap: add CONFIG_MM_ID guard for folio_test_large_maybe_mapped_shared() To: Lance Yang , Andrew Morton Cc: mingzhe.yang@ly.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Lance Yang References: <20250418152228.20545-1-lance.yang@linux.dev> <20250420162925.2c58c018defee9ee192be553@linux-foundation.org> <641755b75b4ecb9c9822e15e707a0ebf1e250788@linux.dev> <20250421122239.710f5d63487853556cb8f57e@linux-foundation.org> 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: 6HLlvxVp35RDRR6yWQ_cV9uamLxdNp2vu096zvcjNBY_1745305256 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Stat-Signature: uahtt4hwsajdc94wpy6iubyxqk4ip5r8 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 4CABBA0013 X-Rspam-User: X-HE-Tag: 1745305259-510044 X-HE-Meta: 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 8puxHxTn 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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 22.04.25 06:35, Lance Yang wrote: > April 22, 2025 at 3:22 AM, "Andrew Morton" wrote: > > > >> >> On Mon, 21 Apr 2025 05:13:03 +0000 "Lance Yang" wrote: >> >>> >>> Can we just slap "#ifdef CONFIG_MM_ID" around the whole function? It >>> >>> >>> >>> should have no callers, right? If the linker ends up complaining then >>> >>> >>> >>> something went wrong. >>> >>> >>> >>> The reason we can't simply add #ifdef CONFIG_MM_ID around folio_test_large_maybe_mapped_shared() >>> >>> is because its caller folio_maybe_mapped_shared() relies on IS_ENABLED(CONFIG_MM_ID). >>> >>> >>> >>> If we do, with CONFIG_TRANSPARENT_HUGEPAGE=N, we'll hit compilation errors like: >>> >>> >>> >>> ./include/linux/mm.h: In function ‘folio_maybe_mapped_shared’: >>> >>> ./include/linux/mm.h:2337:16: error: implicit declaration of function ‘folio_test_large_maybe_mapped_shared’; did you mean ‘folio_maybe_mapped_shared’? [-Werror=implicit-function-declaration] >>> >>> 2337 | return folio_test_large_maybe_mapped_shared(folio); >>> >>> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> | folio_maybe_mapped_shared >>> >>> cc1: some warnings being treated as errors >>> >> >> That's OK - provide a declaration of folio_maybe_mapped_shared() but no >> >> definition. So the compiled-out code can be compiled and the linker >> >> will confirm that it's never actually called. >> > > Got it, that works as well ;) > > So if David is cool with it, I'll send out the new version like this: > > diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h > index d3909cb1e576..a762e4b4eab4 100644 > --- a/include/linux/page-flags.h > +++ b/include/linux/page-flags.h > @@ -1230,10 +1230,15 @@ static inline int folio_has_private(const struct folio *folio) > return !!(folio->flags & PAGE_FLAGS_PRIVATE); > } > > +#ifdef CONFIG_MM_ID > static inline bool folio_test_large_maybe_mapped_shared(const struct folio *folio) > { > return test_bit(FOLIO_MM_IDS_SHARED_BITNUM, &folio->_mm_ids); > } > +#else > +bool folio_test_large_maybe_mapped_shared(const struct folio *folio); > +#endif Fine with me. At this point, I do prefer inlining the function, though. -- Cheers, David / dhildenb