handle_level_irq(9)

📦 version 7.3.1, in nixpkgs unstable

💅 handle_level_irq(9) — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual, page handle_level_irq(9) ✨ this is the level-type irq handler and honestly? she's lowkey carrying the whole interrupt game. let's get into it 🫶

🌸 NAME 🌸

handle_level_irq — the level type irq handler 💖 like, that's her whole job. that's the assignment and she ate.

✨ SYNOPSIS ✨

void handle_level_irq (struct irq_desc *desc );

no cap, that's the whole signature. short, iconic, to the point 👑

🎀 ARGUMENTS 🎀

  • desc — the interrupt description structure for this irq 🦋 — yeah she needs the whole struct irq_desc like it's her emotional support data structure, because it literally is.

💜 DESCRIPTION 💜

okay so here's the vibe check: level type interrupts stay active for as long as the hardware line is sitting at the active level. like, they don't just ping once and dip — they're main character energy, they linger 💀

which means (and this is the important bit, ngl) it may be required to mask the interrupt, and then unmask it after the associated handler has acknowledged the device — so that the interrupt line is back to inactive 🙈

so basically: mask → handler does its thing and acks the device → unmask. periodt. that's the whole dance, and it's giving choreography 💅

🔥 SEE ALSO 🔥

Kernel file ./kernel/irq/chip.c — go read her, she's iconic:

🧚 okay that's a lot of see-alsos but she's got a big friend group, we don't judge. iykyk 💖

aaaand that's the page bestie!! 🎀 this little beauty lives in ./kernel/irq and the version stamp on her is October 2026 — so she's fresh, she's current, she's slaying into the future 🌈⭐ go ack your devices responsibly, mwah 💋💅

📦 where this page comes from