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Wed, 12 Jun 2024 10:07:44 -0700 (PDT) Date: Wed, 12 Jun 2024 10:07:44 -0700 (PDT) From: "Christoph Lameter (Ampere)" To: Peter Zijlstra cc: Thomas Gleixner , axboe@kernel.dk, linux-kernel@vger.kernel.org, mingo@redhat.com, dvhart@infradead.org, dave@stgolabs.net, andrealmeid@igalia.com, Andrew Morton , urezki@gmail.com, hch@infradead.org, lstoakes@gmail.com, Arnd Bergmann , linux-api@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, malteskarupke@web.de Subject: Re: [PATCH v1 11/14] futex: Implement FUTEX2_NUMA In-Reply-To: <20230731180320.GR29590@hirez.programming.kicks-ass.net> Message-ID: <2eb23678-e1c7-816d-4807-f324c771e6ed@gentwo.org> References: <20230721102237.268073801@infradead.org> <20230721105744.434742902@infradead.org> <87pm48m19m.ffs@tglx> <20230731180320.GR29590@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-Rspamd-Queue-Id: 12A33C0013 X-Rspamd-Server: rspam10 X-Rspam-User: X-Stat-Signature: mxb11ngugbidr5sog5meutnhfrmkhhz8 X-HE-Tag: 1718212616-87138 X-HE-Meta: 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 lL1jFR4u MqaVydHx3isNPu3DeuK8zXnc71qjx7W+rt3LaI8ZTk1b/EqG+kzch8Y3terv3gZResB+vxvDNYKDnovdgAmYe6cxBHB9xdlnJmBxzhTKdmM3kIUJRpaBgssFJEbJ4vVWNy7mlVzN57qNC/8Wtz3itvuhSj+SVg8kEi5+Gpi8Z0XwWQ+PSeta/d0Fnw99gQ3bnTcxZ 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 Mon, 31 Jul 2023, Peter Zijlstra wrote: >> Is nr_node_ids guaranteed to be stable after init? It's marked >> __read_mostly, but not __ro_after_init. > > AFAICT it is only ever written to in setup_nr_node_ids() and that is all > __init code. So I'm thinking this could/should indeed be > __ro_after_init. Esp. so since it is an exported variable. > > Mike? Its stable and lots of other components depend on it like f.e. the size of cpumasks.