irq_update_affinity_hint(9)

okay so bestie, welcome to the Kernel API Manual page for irq_update_affinity_hint — yes, irq_update_affinity_hint(9) — and it's giving "small API, very specific job, main character energy" 💅✨

🌸 NAME 🌸

irq_update_affinity_hint — Update the affinity hint. That's it, that's the name, no cap.

🦋 SYNOPSIS 🦋

int irq_update_affinity_hint (unsigned int irq , const struct cpumask *m
       );

🎀 ARGUMENTS 🎀

• irq — the interrupt to update, bestie.
• m — a cpumask pointer; pass NULL to clear the hint. Lowkey important: it's NULL that clears it.

💅 DESCRIPTION 💅

This one updates the affinity hint. Periodt. But — and this is the part where you 👀 — it does not change the affinity of the interrupt. So it's hint business only, not "actually rearrange the interrupt" business.

🔗 SEE ALSO 🔗

• Kernel file: ./include/linux/interrupt.h
• struct irqaction(9)
• request_irq(9)
• struct irq_affinity_notify(9)
• struct irq_affinity(9)
• struct irq_affinity_desc(9)
• irq_set_affinity_and_hint(9)

okay that's the whole page, bestie 🫶 source/version: ./include/linux; date: October 2026; page: irq_update_affinity_hint(9). byeee 💖