irq_percpu_is_enabled(9)

✨ irq_percpu_is_enabled ✨

okay so this is a page from the Kernel API Manual (section 9, kernel devs only, no gatekeeping 💅) and it's literally about checking if a per-cpu irq is turned on. tiny page, but iconic.

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🌸 NAME 🌸

irq_percpu_is_enabled — check whether the per cpu irq is enabled 🫶

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🦋 SYNOPSIS 🦋

bool irq_percpu_is_enabled (unsigned int irq );

like, you pass it an irq and it hands you back a bool, that's the whole vibe ✨

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🎀 ARGUMENTS 🎀

• irq — the Linux irq number you wanna check, bestie. that's the one. 👑

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💖 DESCRIPTION 💖

So here's the tea: you must call this from a non migratable context. not optional, not a suggestion, it's giving hard requirement 😭

What it does is return the enable state of a per cpu interrupt, on the current cpu — like, the one you're standing on right now. no cap. 🧚

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🌈 SEE ALSO 🌈

the kernel file ./kernel/irq/manage.c is the source of truth here, and here's the whole squad of related pages 💜:

• synchronize_hardirq(9)
• synchronize_irq(9)
• irq_can_set_affinity(9)
• irq_can_set_affinity_usr(9)
• irq_set_thread_affinity(9)
• irq_affinity_schedule_notify_work(9)
• irq_update_affinity_desc(9)
• irq_set_affinity(9)
• irq_force_affinity(9)
• irq_set_affinity_notifier(9)
• irq_set_vcpu_affinity(9)
• disable_irq_nosync(9)
• disable_irq(9)
• disable_hardirq(9)
• disable_nmi_nosync(9)
• enable_irq(9)
• enable_nmi(9)
• irq_set_irq_wake(9)
• irq_wake_thread(9)
• free_irq(9)
• request_threaded_irq(9)
• request_any_context_irq(9)
• request_nmi(9)
• free_percpu_irq(9)
• request_percpu_irq_affinity(9)
• request_percpu_nmi(9)
• prepare_percpu_nmi(9)
• teardown_percpu_nmi(9)
• irq_get_irqchip_state(9)
• irq_set_irqchip_state(9)
• irq_has_action(9)
• irq_check_status_bit(9)

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okay that's the whole page, love her 💅 this came out of ./kernel/irq and the version is dated October 2026 — go off, October 2026, you ate 🍓✨💀