handle_nested_irq(9)

💖 handle_nested_irq — a kernel API manual moment 💖

okay so bestie, welcome to the <pink>handle_nested_irq</pink> page, straight out of the 9 section of the kernel API manual. she's short, she's sweet, and she's literally the answer when your interrupts are living inside a thread. let's get into it 🎀

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✨ NAME ✨

handle_nested_irq — handle a nested irq from a irq thread 🧚

like, yes, that's the whole name. no cap, it's giving "the function does what it says on the tin."

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🌸 SYNOPSIS 🌸

void handle_nested_irq (unsigned int irq );

return type? void. no notes, she doesn't return anything. we respect that 💅

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🦋 ARGUMENTS 🦋

• irq — the interrupt number 🔥 that's it. that's the whole argument. it's an unsigned int and it's the interrupt number you're handling, periodt.

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👑 DESCRIPTION 👑

okay so here's the vibe: handle_nested_irq handles interrupts which are nested into a threaded interrupt handler. 🧵✨

and the part that actually matters — the handler function is called inside the calling thread's context. 📌 like, not some separate interrupt context, not a magical other world, the context of whoever's calling. that's the whole flex, iykyk.

ngl bestie this is one of those tiny descriptions that's doing a lot of heavy lifting, so don't sleep on it — "inside the calling threads context" is the entire point of the nested flow. 🌈

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🔍 SEE ALSO 🔍

this list is long long, but we're not skipping a single one, because every reference deserves her moment 💜

• 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_simple_irq(9)
• handle_untracked_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)

also, in case you were wondering where the source lives — kernel file ./kernel/irq/chip.c 🍓 that's the home base, bestie.

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💫 a little sign-off 💫

okay that's the page!! this one came from the ./kernel/irq corner of the world, dated October 2026, and you can find her filed under handle_nested_irq(9) whenever you need her. go forth and nest those irqs responsibly, you absolute main character 💖✨🫶