irq_cpu_rmap_add(9)

Hiiii bestie!! 💖 This is the irq_cpu_rmap_add(9) page from the Kernel API Manual, and it's literally about adding an IRQ to a CPU affinity reverse-map. No cap, it's giving "plumbing but make it cute" energy. 🫶

✨ NAME ✨

irq_cpu_rmap_add — add an IRQ to a CPU affinity reverse-map 💅

🌸 SYNOPSIS 🌸

int irq_cpu_rmap_add (struct cpu_rmap *rmap , int irq );

🎀 ARGUMENTS 🎀

• rmap — The reverse-map. That's the whole vibe. 🗺️
• irq — The IRQ number. The little number that says which interrupt we're talking about. 🔢

🦋 DESCRIPTION 🦋

Okay so here's the tea: this adds an IRQ affinity notifier that will update the reverse-map automatically. It's basically set-and-forget, bestie — the notifier keeps the map fresh for you. ✨

⚠️ But listen: it must be called in process context, and it has to happen after the IRQ is allocated but before it is bound with request_irq. Timing is everything, okay? Don't skip the order. periodt. 💀

💜 SEE ALSO 💜

This all lives in the kernel file ./lib/cpu_rmap.c — go peek at these friends too, iykyk:

• alloc_cpu_rmap(9)
• cpu_rmap_release(9)
• cpu_rmap_get(9)
• cpu_rmap_put(9)
• cpu_rmap_add(9)
• cpu_rmap_update(9)
• free_irq_cpu_rmap(9)
• irq_cpu_rmap_notify(9)
• irq_cpu_rmap_release(9)
• irq_cpu_rmap_remove(9)

Cute little sign-off from irq_cpu_rmap_add(9) 💌 — source/version: ./lib, date: October 2026. Stay slay, bestie, and may your reverse-map always update automatically 🌈👑💅