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[2003:d8:2f27:6d00:7b96:afc9:83d0:5bd]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46139122a8fsm23710285e9.7.2025.09.17.00.16.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 17 Sep 2025 00:16:30 -0700 (PDT) Message-ID: <2bd45749-e483-45ea-9c55-74c5ba15b012@redhat.com> Date: Wed, 17 Sep 2025 09:16:28 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC][PATCH v3 09/16] genirq/irqdesc: Have nr_irqs as non-static To: Eugen Hristev , Thomas Gleixner , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, andersson@kernel.org, pmladek@suse.com, rdunlap@infradead.org, corbet@lwn.net, mhocko@suse.com Cc: tudor.ambarus@linaro.org, mukesh.ojha@oss.qualcomm.com, linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org, jonechou@google.com, rostedt@goodmis.org, linux-doc@vger.kernel.org, devicetree@vger.kernel.org References: <20250912150855.2901211-1-eugen.hristev@linaro.org> <20250912150855.2901211-10-eugen.hristev@linaro.org> <87cy7q9k8y.ffs@tglx> <87a52u9jyl.ffs@tglx> <8df2cf28-c15e-4692-a127-6a5c966a965e@linaro.org> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 1519E140011 X-Stat-Signature: 9khtbyxz3qnnn4au8outipuhog1skt66 X-HE-Tag: 1758093394-560886 X-HE-Meta: U2FsdGVkX1+EYGtyBhFu2uaGgV3fzI31qU0UDkyEq7C4MG8HZEbbsTOKDBeRbmBy5pWiSSuAEUCeU/PJDad+t/vMOG5cgKTG7za9zjjsbIvxVs6P4blM0niM6bUm+2dInF2p1uToADe1fAs2jB44lC6CAigGsiz3Kt0X4EGDOfZ6zOLbEoAhKtuGcFVCw7jdab/T19tYVhIMwtaDryYIL2gO8GlyoXwzQS5QVzU45dQRBAVNg2+EfqLypsDfwoF1CeS3f1bupqeM2HzVofxmrzWBPFMro27LE/DDPFW81gvICLq3u4BrN181O921P9icIibPZCbDFHnHX9K2DZ7EAjKdSlnWAS6DRHYTF2DJkypvIkIGDGjuKyJOTUMa7lT4aiEasdXhOqCbUavcIeK7ByhJs9IC+mqJFqxbQf5eaP+cXmCjIzr0+lZ/ii/Aw5wjhoG6xqOHxo3kW7HVLpEHvXb7JAZpHibriUtNW10QSbDqNCMb1LRPmKJZiICVEamWXycrBo4H4J505hzgM5voOGrOg7//Vv1GyIuxcLWP7bqk1Rlv/bstjlI+bH/pxdSOdwBBrWeNE0tGk+HbeE1m3MaU1azcJNTKIVF1hkGUC9iVOPbDfUUuRWszVdIjZ2xU+4qb/bhKwrs0LoqWij7tns8OvDJisvqRloKbEoZz5pQ0xC+TcdjAY32kjq5993qUXsWpjTc6MTW/CmxFZ0EQCZ4UoTpy/VNGX43yr2I06rGA6qPMahNXjNuUbgpXAKMUZSGHKMoNWc5VbNSNRAt+k70OQ3XpweYuNb07gWIgbOlRWaCiQxgURGp5jQzdxiqM61ZhOPX5gLduuHklpWxbz/7rZQAbH49rZrEXc+Q7PwoEnJvB51rxhrjWPkljqUYVJDLHki9kz7tu3LWlnDN5P6H5ekynWA8wn5FMlFk8nRuo7LhiN8NhXix3oHqCQmXP+WilpF/eAAR/N3OoRUL v6FJZrRn iY1HMxGWmdptEEUXWd62c5LSIW8t+zJHxAl0yNDslone3ej9SXZN0ljRA92R6y6ecVQDqPwrYw2ZCi+aoPqGeKozn3SS41zsDB3Q9fCdzz0p6jvMwVf6biwXj+up13JGMXxtOFG4zTuaP6Fx52eo15EF6zTfmI17PS37O2oeP6q68cJKB5LaXjCd1CqL/6KxGnPbmcUj6A4mKu6mhaCY/EGTqzSvpdT12Up301F9z6Q+UDtxFxAXLXORutegVXi2EP4DvGjsS7v3U2G6+yzJMHRcAQR4dC8WxivZfmH5HmB73LJbMORw/yzPKch//Q8kJrDg3xsIswaEqorWxv2uGloURVsO4HdVGHoT9LENJ2yGUFAx7eZc8jHWvOWKNkpXdjjGGTOPq8tF30j5TptMjsYkGUB2taE4iFCpjPOtsLJvXZxCnVnn5m2tMuYjqCJBKe4j9XR9Pxq5z3B/vWvtG+eHczkQwPT93OO0A 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 17.09.25 07:43, Eugen Hristev wrote: > > > On 9/17/25 00:16, Thomas Gleixner wrote: >> On Tue, Sep 16 2025 at 23:10, Thomas Gleixner wrote: >>> On Fri, Sep 12 2025 at 18:08, Eugen Hristev wrote: >>>> nr_irqs is required for debugging the kernel, and needs to be >>>> accessible for kmemdump into vmcoreinfo. >>> >>> That's a patently bad idea. >>> >>> Care to grep how many instances of 'nr_irqs' variables are in the >>> kernel? >>> >>> That name is way too generic to be made global. >> >> Aside of that there is _ZERO_ justification to expose variables globaly, >> which have been made file local with a lot of effort in the past. >> >> I pointed you to a solution for that and just because David does not >> like it means that it's acceptable to fiddle in subsystems and expose >> their carefully localized variables. It would have been great if we could have had that discussion in the previous thread. I didn't like what I saw in v2. In particular, having subsystems fiddle with kmemdump specifics. I prefer if we can find a way to not have subsystems to that. >> > > I agree. I explained the solution to David. He wanted to un-static > everything. I disagreed. Some other subsystem wants to have access to this information. I agree that exposing these variables as r/w globally is not ideal. I raised the alternative of exposing areas or other information through simple helper functions that kmemdump can just use to compose whatever it needs to compose. Do we really need that .section thingy? -- Cheers David / dhildenb