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Thu, 24 Jul 2025 10:54:26 +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 nj0UKuIQgmh2bgAAD6G6ig (envelope-from ); Thu, 24 Jul 2025 10:54:26 +0000 Message-ID: Date: Thu, 24 Jul 2025 12:54:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] mm/gup: remove (VM_)BUG_ONs Content-Language: en-US From: Vlastimil Babka To: John Hubbard , Lorenzo Stoakes , Jason Gunthorpe Cc: David Hildenbrand , Michal Hocko , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , "Liam R. Howlett" , Mike Rapoport , Suren Baghdasaryan , Peter Xu References: <1a7513cf-4a0a-4e58-b20d-31c1370b760f@lucifer.local> <72bb36f2-65b6-4785-af9d-5b1f8126fc78@lucifer.local> <2f866f12-2aa0-4456-b215-08ddc9b13b1e@redhat.com> <3dfbbd63-697d-42aa-8906-539d74df9123@nvidia.com> <44af8f5a-2d94-498b-a3e0-31f5dde74538@redhat.com> <20250606184212.GB63308@ziepe.ca> <20250607134214.GA158671@ziepe.ca> <04f52d21-baeb-4286-99eb-99edead514b8@lucifer.local> <8ce6c104-d2fb-4fed-a108-224a6113c227@nvidia.com> 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-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 40919120002 X-Stat-Signature: jb673s9y4x9muiaie7ut9jesr1utos7p X-HE-Tag: 1753354468-72604 X-HE-Meta: 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 ZhBHjV+0 Xn3RhqUHi7X29/Qs0YGVH4rL7ksfJtYaN/lD7xVRvfBFX1eYXWiZtLwqOEMwy2CI4RJO8xrwhaAEz+KELvXWGLHqYR+kDW7BwXNRuzdriR0lNqpjlfcTKFq/4TwDiUu9mHwGyGKiQPwcBRf5jdxNY8gdqgJFhh5dsEKXfmhrfk+4XIxXffYPfwd12Ne870TGeGaS+4MBLUS/u4EOHGROixZFCKiCkv+i97QXfa4PYENFbgDpRZLg/w2xxX/PEmcIZGSumy1TPqMxgIvdRXN1y+6qAE/A3wbrJvzqJ8iUaDPxNl+JMuuBArDsagXIkV1PPVv2kPLTyIDUbx+M= 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 6/9/25 11:57, Vlastimil Babka wrote: > On 6/7/25 8:00 PM, John Hubbard wrote: >> On 6/7/25 6:53 AM, Lorenzo Stoakes wrote: >> The worst part is that if you go to reproduce a problem, you don't >> see the next warning in the logs!! This is devastating, especially if >> the site makes it hard to ask for a system reboot. (If you have >> ~20,000 nodes in the cluster, a reboot is not a small affair.) > > Assuming you know how to reproduce the problem... I wonder if it would > help if there was a way (sysctl?) to re-arm all the _ONCE warnings. It > shouldn't be that hard hopefully? Oh hey it already exists, since 2017 echo 1 > /sys/kernel/debug/clear_warn_once