irq_set_irqchip_state(9)

📦 version 7.3.1, in nixpkgs unstable

💅 irq_set_irqchip_state — kernel API manual (section 9) ✨

okay bestie, so this one lives in section 9 of the Kernel API Manual, and it's genuinely one of those little functions that's doing the most behind the scenes 🎀

🌸 NAME 🌸

irq_set_irqchip_state — set the state of a forwarded interrupt. that's it. that's the whole vibe ✨

🦋 SYNOPSIS 🦋

int irq_set_irqchip_state (unsigned int irq , enum irqchip_irq_state
which , bool val );

like, yes it's three args, no it's not scary, keep reading 💖

🎀 ARGUMENTS 🎀

  • irq — the interrupt line that's being forwarded to a VM. this is the star of the show, the main character 👑
  • which — which state you're restoring, and it's gotta be one of the IRQCHIP_STATE_* values. pick one, no freestyling 🙈
  • val — the value that corresponds to which. they go together, iykyk 💅

🌈 DESCRIPTION 🌈

so what this call does is set the internal irqchip state of an interrupt, and what exactly it sets depends on the value of which. simple as that, no cap ✨

⚠️ okay this part is important, don't skip it: this function should be called with migration disabled if the interrupt controller has per-cpu registers. fr fr, that's a real caveat, not a suggestion 💀

💜 SEE ALSO 💜

the kernel file ./kernel/irq/manage.c (yes, that's where the magic happens 🧚) plus this whole friend group of functions:

like, that's the whole group chat, go say hi 🫶

and that's the page!! 🎉 this iconic little entry comes from ./kernel/irq and it's dated October 2026 — so yeah, it's giving future-core, and it's still irq_set_irqchip_state(9) through and through 💖✨🍓

📦 where this page comes from