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([74.48.213.230]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c159e25dc7sm2786389eec.27.2026.03.25.02.10.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2026 02:10:11 -0700 (PDT) From: Qiliang Yuan Date: Wed, 25 Mar 2026 17:09:35 +0800 Subject: [PATCH 04/15] genirq: Support dynamic migration for managed interrupts Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260325-dhei-v12-final-v1-4-919cca23cadf@gmail.com> References: <20260325-dhei-v12-final-v1-0-919cca23cadf@gmail.com> In-Reply-To: <20260325-dhei-v12-final-v1-0-919cca23cadf@gmail.com> To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Thomas Gleixner , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Tejun Heo , Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Anna-Maria Behnsen , Ingo Molnar , Shuah Khan Cc: linux-kernel@vger.kernel.org, rcu@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Qiliang Yuan X-Mailer: b4 0.13.0 Managed interrupts currently have their affinity determined once, honoring boot-time isolation settings. There is no mechanism to migrate them when housekeeping boundaries change at runtime. Enable managed interrupts to respond dynamically to housekeeping updates. This ensures that managed interrupts are migrated away from newly isolated CPUs or redistributed when housekeeping CPUs are added. Signed-off-by: Qiliang Yuan --- kernel/irq/manage.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 349ae7979da0e..f2cba3d7ef624 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -2811,3 +2811,52 @@ bool irq_check_status_bit(unsigned int irq, unsigned int bitmask) return res; } EXPORT_SYMBOL_GPL(irq_check_status_bit); + +#ifdef CONFIG_SMP +static int irq_housekeeping_reconfigure(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct housekeeping_update *upd = data; + unsigned int irq; + + if (action != HK_UPDATE_MASK || upd->type != HK_TYPE_MANAGED_IRQ) + return NOTIFY_OK; + + irq_lock_sparse(); + for_each_active_irq(irq) { + struct irq_data *irqd; + struct irq_desc *desc; + + desc = irq_to_desc(irq); + if (!desc) + continue; + + scoped_guard(raw_spinlock_irqsave, &desc->lock) { + irqd = irq_desc_get_irq_data(desc); + if (!irqd_affinity_is_managed(irqd) || !desc->action || + !irq_data_get_irq_chip(irqd)) + continue; + + /* + * Re-apply existing affinity to honor the new + * housekeeping mask via __irq_set_affinity() logic. + */ + irq_set_affinity_locked(irqd, irq_data_get_affinity_mask(irqd), false); + } + } + irq_unlock_sparse(); + + return NOTIFY_OK; +} + +static struct notifier_block irq_housekeeping_nb = { + .notifier_call = irq_housekeeping_reconfigure, +}; + +static int __init irq_init_housekeeping_notifier(void) +{ + housekeeping_register_notifier(&irq_housekeeping_nb); + return 0; +} +core_initcall(irq_init_housekeeping_notifier); +#endif -- 2.43.0