handle_untracked_irq(9)

💅 handle_untracked_irq — the Kernel API Manual files, bestie

okay so you opened the Kernel API Manual page for handle_untracked_irq(9) and honestly? this one's a little niche but it's giving "backend bestie who doesn't need credit" energy. let's get into it 🎀

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✨ NAME ✨

handle_untracked_irq — IRQs that are simple, and decoded in software. literally that's the whole vibe.

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🦋 SYNOPSIS 🦋

void handle_untracked_irq (struct irq_desc *desc );

no cap, that's the entire signature. she's short, she's sweet, she's void. 💜

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🌸 ARGUMENTS 🌸

• desc — the interrupt description structure for this irq. yeah, the struct irq_desc * from the synopsis. she's the main character here 🫶

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🔥 DESCRIPTION 🔥

so here's the tea ☕ — untracked interrupts get sent over from a demultiplexing interrupt handler. when does that happen? when the demultiplexer literally does not know which device in its multiplexed irq domain generated the interrupt. it's giving "idk her" 😭

and because nobody knows who fired it, IRQs handled through here are not subjected to:

• stats tracking (no receipts 📵)
• randomness (no entropy contribution, sorry gamers)
• spurious interrupt detection (no vibe check on whether it's even real 💀)

so yeah, she's flying blind and she's fine with it. iconic behavior honestly.

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🙈 NOTE 🙈

just like handle_simple_irq, the caller is expected to handle the ack, clear, mask and unmask issues if necessary. that's on you, bestie — not her. she's just the handler. 💅

no seriously, if you skip the ack/clear/mask/unmask stuff, that's a you problem. this page said what it said.

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👑 SEE ALSO 👑

kernel file ./kernel/irq/chip.c — and like, the entire friend group:

irq_set_chip(9), irq_set_irq_type(9), irq_set_handler_data(9), irq_set_msi_desc_off(9), irq_set_msi_desc(9), irq_set_chip_data(9), irq_disable(9), handle_nested_irq(9), handle_simple_irq(9), handle_level_irq(9), handle_fasteoi_irq(9), handle_fasteoi_nmi(9), handle_edge_irq(9), handle_percpu_irq(9), handle_percpu_devid_irq(9), irq_cpu_online(9), irq_cpu_offline(9), handle_fasteoi_ack_irq(9), handle_fasteoi_mask_irq(9), irq_chip_set_parent_state(9), irq_chip_get_parent_state(9), irq_chip_shutdown_parent(9), irq_chip_startup_parent(9), irq_chip_enable_parent(9), irq_chip_disable_parent(9), irq_chip_ack_parent(9), irq_chip_mask_parent(9), irq_chip_mask_ack_parent(9), irq_chip_unmask_parent(9), irq_chip_eoi_parent(9), irq_chip_set_affinity_parent(9), irq_chip_set_type_parent(9), irq_chip_retrigger_hierarchy(9), irq_chip_set_vcpu_affinity_parent(9), irq_chip_set_wake_parent(9), irq_chip_request_resources_parent(9), irq_chip_release_resources_parent(9), irq_chip_compose_msi_msg(9), irq_chip_pm_get(9), irq_chip_pm_put(9)

like, the whole irq_chip cinematic universe fr fr 🌈⭐

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and that's the page!! she lives in ./kernel/irq, this copy is from October 2026, and it's the handle_untracked_irq(9) page of the Kernel API Manual. mwah 💋 go handle your acks bestie 💖🧚‍♀️