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Fri, 23 Jan 2026 08:41:24 +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 O0kJNzQ0c2nLSQAAD6G6ig (envelope-from ); Fri, 23 Jan 2026 08:41:24 +0000 Message-ID: <4b0b5a72-d4a0-4e40-8632-d2f9268e9e09@suse.cz> Date: Fri, 23 Jan 2026 09:41:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RESEND v3 04/10] mm/vma: add+use vma lockdep acquire/release defines Content-Language: en-US To: Suren Baghdasaryan , Lorenzo Stoakes Cc: Andrew Morton , David Hildenbrand , "Liam R . Howlett" , Mike Rapoport , Michal Hocko , Shakeel Butt , Jann Horn , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, Peter Zijlstra , Ingo Molnar , Will Deacon , Boqun Feng , Waiman Long , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt References: <4703b7320796908b9a0827c3d42d74d11b703714.1769086312.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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: 5iyme88ei3xf63cz1zfidirpcoy51kwi X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: DB5381C000A X-HE-Tag: 1769157686-204354 X-HE-Meta: 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 JgTHRIk4 2bCIs5jdbfahkz6TnZPBs49knj19D25h8j/tTzbWPbo2IrKd3INRXBR36jvFJwFkHYuLq5EgowgheSBYSW5kFSJQpEnSuEMAnqfAMsfwhlOudATwVdWYeMkX14v1Or0LeTkIaGbF1yIFPtrkPNhPLrUMawnRYIOqo/sr6wZxlBnapTDCiEphqm+m6y4I+6elF6Ez/R/QI40kQEyGkYTsmUImm5EEtkFydP3oetyE+JhYRU0ZnqCxEF4HGDWqYtC8soGeSsIOxdSoITUJIpzbsfQukTluMefNrX4NTvs2JzUqSVpu13YHBQKHyBQDhJij8s5vYeaz28eH9vFQZrOysV/EeuxFfoN8O1B8nEyhPUGSJT8Y= 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 1/22/26 20:41, Suren Baghdasaryan wrote: >> > +/* >> > + * VMA locks do not behave like most ordinary locks found in the kernel, so we >> > + * cannot quite have full lockdep tracking in the way we would ideally prefer. >> > + * >> > + * Read locks act as shared locks which exclude an exclusive lock being >> > + * taken. We therefore mark these accordingly on read lock acquire/release. >> > + * >> > + * Write locks are acquired exclusively per-VMA, but released in a shared >> > + * fashion, that is upon vma_end_write_all(), we update the mmap's seqcount such >> > + * that write lock is de-acquired. >> > + * >> > + * We therefore cannot track write locks per-VMA, nor do we try. Mitigating this >> > + * is the fact that, of course, we do lockdep-track the mmap lock rwsem. >> > + * >> > + * We do, however, want to indicate that during either acquisition of a VMA >> > + * write lock or detachment of a VMA that we require the lock held be exclusive, >> > + * so we utilise lockdep to do so. >> > + */ >> > +#define __vma_lockdep_acquire_read(vma) \ > > One question I forgot to ask. Are you adding "__" prefix to indicate > no other users should be using them or for some other reason? I'd say it's the case of 'it has to be in a "public" header but not expected to be used directly" by the end-users of the header'.