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[2003:cb:c736:1000:9e30:2a8a:cd3d:419c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43bcf9c7ac3sm512645e9.13.2025.03.04.02.31.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 Mar 2025 02:31:29 -0800 (PST) Message-ID: <4dee3069-e782-4e37-a46a-ac3a9abb82fa@redhat.com> Date: Tue, 4 Mar 2025 11:31:27 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/page_alloc: Add lockdep assertion for pageblock type change To: Brendan Jackman , Stephen Rothwell Cc: Andy Shevchenko , Johannes Weiner , kernel test robot , Andrew Morton , Oscar Salvador , llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, Linux Memory Management List , Vlastimil Babka , linux-kernel@vger.kernel.org References: <20250227-pageblock-lockdep-v1-1-3701efb331bb@google.com> <202503010129.rJvGqZN1-lkp@intel.com> <20250228182804.GB120597@cmpxchg.org> <20250304101357.66067dd3@canb.auug.org.au> 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: ETYRU28f2UY4J6in5t07UmPzMdho6vTx5sQaD_l4-QU_1741084290 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: 8dcdtkjr6cnssfmjonkqj9ft8xuun931 X-Rspamd-Queue-Id: 304E94000D X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1741084295-850832 X-HE-Meta: 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 FXQUi/EG 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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 04.03.25 11:18, Brendan Jackman wrote: > On Tue, Mar 04, 2025 at 10:13:57AM +1100, Stephen Rothwell wrote: >> Hi Andy, >> >> On Mon, 3 Mar 2025 13:18:42 +0200 Andy Shevchenko wrote: >>> >>> On Fri, Feb 28, 2025 at 01:28:04PM -0500, Johannes Weiner wrote: >>>> On Sat, Mar 01, 2025 at 01:31:30AM +0800, kernel test robot wrote: >>> >>>> The patch is missing a dummy in_mem_hotplug() in the >>>> !CONFIG_MEMORY_HOTPLUG section of . >>> >>> +1, I just stumbled over and this is not fixed in today's Linux Next. I'm >>> wondering how this was missed during merge into Linux Next. Stephen? >> >> I just get what people put in their trees. There are no conflicts >> around this and none of my builds failed, so I didn't see the problem. >> Has someone sent a fix patch to Andrew? If so, if you forward it to >> me, I will add it to linux-next today. > > Andrew has backed it out of mm-unstable now. There's a v2 [0] which > still has runtime issues but AFAIK it's not in any tree yet. > > [0] https://lore.kernel.org/linux-mm/20250303-pageblock-lockdep-v2-1-3fc0c37e9532@google.com/ > > In case it helps calibrate expectations: I think this particular patch > had been reviewed but in general some patches get into mm-unstable > without any review being recorded at all. My understanding is that > Andrew squints at it and goes "that looks like it will probably > eventually get merged" and puts it in so that people get a view of > likely upcoming changes. > > So if an issue like this reaching linux-next is a big problem then I > think the solution is not to merge mm-unstable. I'm not sure how > high the bar is supposed to be for feeding into linux-next. Last year at LSF/MM I raised that maybe we should have something in-between mm-unstable and mm-stable that would get merged into -next. ( "mm-almost-stable" / "mm-for-next" ;) ) Alternatively, we could add something like "mm-staging" before "mm-unstable" and "mm-stable", whereby only "mm-unstable" would get merged into -next. Ideally, we'd have at least build-bots and some basic sanity checks going on on such a staging environment. After a couple of days (not more) of survival in such an environment, it could be moved to the tree that gets exposed to -next/ I guess the downside is that it's "yet another branch" and "yet more build+testing" effort; in particular, if build+testing doesn't happen it will be worthless. And likely, a lot of build+testing is happening on linux-next only. I have pretty good results with build bots going crazy on my branches, so most stuff that I send (after letting is rest for a couple of days on a public branch) doesn't really result in build issues. -- Cheers, David / dhildenb