gic_irq_lock_cluster(9)

🎀 gic_irq_lock_cluster 💅

okay so bestie, welcome to the Kernel API Manual page for gic_irq_lock_cluster(9) — yes that (9) means it's a kernel function, we're in the big leagues now ✨

---

💖 NAME 💖

gic_irq_lock_cluster — locks redirect block access to an IRQ's cluster, no cap 🔒🦋

---

✨ SYNOPSIS ✨

bool gic_irq_lock_cluster (struct irq_data *d );

like... that's it. that's the whole vibe. one argument, one bool back 🫶

---

🌸 ARGUMENTS 🌸

• d — a struct irq_data that corresponds to the interrupt we're interested in 💫 literally the interrupt you care about, handed over in struct form.

---

👑 DESCRIPTION 👑

okay so here's the tea ☕ — this function locks redirect register block access to the global register block of the GIC, and it does that within the remote cluster that the IRQ corresponding to d is affine to. and it returns true once that redirect block setup & locking has been performed ✅🔥

but wait, there's a plot twist 😭 — if d is affine to the local cluster, then no locking is performed at all, and this function returns false. that false is basically a little note to the caller going "hey bestie, just access the local cluster's registers directly, you don't need the overhead of indirection through the redirect block" 💅

so in summary (iykyk):

• if this function returns true → the caller should access GIC registers using the redirect register block accessors, and then call mips_cm_unlock_other when done 🫡 don't forget the unlock, that's the whole point of the lock, fr fr
• if this function returns false → the caller should trivially access GIC registers in the local cluster, easy peasy 🍓

and the return value one more time for the people in the back: returns true if locking performed, else false ⭐

💀 no cap: true means you're going through the redirect block and you owe a mips_cm_unlock_other afterwards. false means local registers, zero indirection, go nuts.

---

🦋 SEE ALSO 🦋

• Kernel file ./drivers/irqchip/irq-mips-gic.c — go read the source, it's giving main character energy 📖✨
• for_each_online_cpu_gic(9) — another icon, check her out 👑

---

and that's the page!! 🌈 mwaaah 💜 this little gem lives under ./drivers/irqchip and the version/date stamp on it is October 2026 — so yeah, future-dated and still slaying 🎀🧚✨ periodt.