irq_inject_interrupt(9)

💖 NAME 💖

okay so bestie, welcome to the irq_inject_interrupt(9) page from the Kernel API Manual 💅 — this one is all about irq_inject_interrupt, and its whole job is literally: inject an interrupt for testing/error injection. That’s the vibe. ✨

✨ SYNOPSIS ✨

here’s the exact signature, no cap:

int irq_inject_interrupt (unsigned int irq );

🎀 ARGUMENTS 🎀

• irq — the interrupt number. that’s the one you’re handing over 🫶

💅 DESCRIPTION 💅

⚠️ bestie, listen: this function must only be used for debug and testing purposes! like, do not make this a whole production situation, okay? 😭

especially on x86, this can cause a premature completion of an interrupt affinity change, causing the interrupt line to become stale. Very unlikely, but possible. so yeah — highkey “handle with care” energy 💀

the injection can fail for various reasons:

• Interrupt is not activated
• Interrupt is NMI type or currently replaying
• Interrupt is level type
• Interrupt does not support hardware retrigger and software resend is either not enabled or not possible for the interrupt

🦋 SEE ALSO 🦋

• Kernel file ./kernel/irq/resend.c — go read it if you want the full lore 📖

and that’s the whole page, bestie 🫶 source/version: ./kernel/irq, date: October 2026 — mwah 💋