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[2003:d8:2f37:2b00:948c:dd9f:29c8:73f4]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3cf275d2717sm14699314f8f.15.2025.09.01.03.01.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 01 Sep 2025 03:01:59 -0700 (PDT) Message-ID: <7e1f4f64-dfc4-4366-8e01-0891b2d4d2b4@redhat.com> Date: Mon, 1 Sep 2025 12:01:58 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC][PATCH v2 22/29] mm/numa: Register information into Kmemdump To: Eugen Hristev , Michal Hocko Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, tglx@linutronix.de, andersson@kernel.org, pmladek@suse.com, linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org, corbet@lwn.net, mojha@qti.qualcomm.com, rostedt@goodmis.org, jonechou@google.com, tudor.ambarus@linaro.org, Christoph Hellwig , Sergey Senozhatsky References: <20250724135512.518487-1-eugen.hristev@linaro.org> <751514db-9e03-4cf3-bd3e-124b201bdb94@redhat.com> <23e7ec80-622e-4d33-a766-312c1213e56b@redhat.com> <77d17dbf-1609-41b1-9244-488d2ce75b33@redhat.com> <9f13df6f-3b76-4d02-aa74-40b913f37a8a@redhat.com> <64a93c4a-5619-4208-9e9f-83848206d42b@linaro.org> <01c67173-818c-48cf-8515-060751074c37@linaro.org> <1b52419c-101b-487e-a961-97bd405c5c33@linaro.org> <99d2cc96-03ea-4026-883e-1ee083a96c39@redhat.com> <98afe1bd-99d2-4b5d-866a-e9541390fab4@linaro.org> <40e802eb-3764-47af-8b4f-9f7c8b5b60c1@linaro.org> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 2CB66100007 X-Stat-Signature: 3frobfezfbgn63ac1amq5rqxwwymxf6j X-Rspam-User: X-HE-Tag: 1756720924-797602 X-HE-Meta: U2FsdGVkX1/KIPTVPbx5ps/Yax7efCQ7gOfIhgdz7yFvcjdpl9r4fZ0PmJQg4ZrhX2RnyBsqmls/jVSdTzV39bdeeIYgvGVcYBueHDMkvP8pDYSX9QtWkmy5+sPERPUzHX005U8uzVdUsCr9IFzplpgM1xxpNxNrKWs2HuvV5lUMew2qLQLDR/Uy26Pfy1vQNMgp1LAx3hcZWV8xPHn4xGOzV2a5UdYJ3xDUDqFYi6qiXHKm3WJdpF6amHbhuwhxuezBXLESLlnSfapvI+Zugr4YDuZp9zXBoHkgpfuTF/bWEVcl1ZPYEiMJv3o+4UlyjD3R3j9YUCSIFi2kCm1IFZgeBSOLAKjmSUnxSrz5aXKlaIiTdgeMUaZBlTCTJp/cST4YGS1dN7I3ntqQrgMDfdURTySKUdDnx3YVt4+YFTSEbGXvCgLixkz84WYCAWxqy18FRtMfEo+HcCxksE8tFCuwRBp4n91nfBeNH9VPOJyM7KGsFDau+uvkmsuOAFAH1oBQD8dSz7e4SMDk5K5Lf7HOf/6u6lqa5G8s2R6ACj4w1i07iu9fORpQkPVL9uo+9FJCzcGjkzJbJWBugs7PdTQHnLItVCzmsaGDdZPvF1nIlXlvmdNsO6v9nVjj2mIY3J6S+DbP2yI3N7Bu8oD52hjmt/0YZZsOefUZrsXmBENBldYqbxILylfGN4XlENBDPsUyXfP9nzhSBZXx6ArQiZjDDrktm5fNzXJ63kjC2HG1hPglRw+BUd2fR0xiNU0xYoQBonZk0pqsBmT94uqGMt1+/EaLJgDbZkalBbZk4sGGnRijfftOIimB2UWOzjJSYsQpZcXNDbwZbqy2EMcz23/xc7FTbB/RRDvVQZ+Wd3hSVm7FkxLslwr0BJDoABdIfPNP8mzHdiG1cVlTWlz0nIrv23wUjoJaAXY2/u3TD+Y4a99wRK1C00eRKRdtVbNuCh4ge9okoPHBnM61N/c 6dHeSkrB 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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: >>> What do you think ? >> >> Looks a bit over-engineered, and will require us to import a header >> (likely kmemdump.h) in these files, which I don't really enjoy. >> >> I would start simple, without any such macro-magic. It's a very simple >> function after all, and likely you won't end up having many of these? >> > > Thanks David, I will do it as you suggested and see what comes out of it. > > I have one side question you might know much better to answer: > As we have a start and a size for each region, this start is a virtual > address. The firmware/coprocessor that reads the memory and dumps it, > requires physical addresses. Right. I was asking myself the same question while reviewing: should we directly export physical ranges here instead of virtual ones. I guess virtual ones is ok. What do you suggest to use to retrieve that > address ? virt_to_phys might be problematic, __pa or __pa_symbol? or > better lm_alias ? All areas should either come from memblock or be global variables, right? IIRC, virt_to_phys() should work for these. Did you run into any problems with them or why do you think virt_to_phys could be problematic? -- Cheers David / dhildenb