probe_irq_off(9)

💅 probe_irq_off(9) — a whole vibe

okay so welcome to the Kernel API Manual, bestie — today's main character is probe_irq_off, aka the little function that wraps up an interrupt autodetect 🎀

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✨ NAME ✨

probe_irq_off — end an interrupt autodetect 🫶

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🌸 SYNOPSIS 🌸

int probe_irq_off (unsigned long val );

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🦋 ARGUMENTS 🦋

• val — mask of potential interrupts. and yes, it's unused. literally just sitting there being decorative 🙈

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💜 DESCRIPTION 💜

so here's the tea ☕ — probe_irq_off scans the unused interrupt lines and returns the line that appears to have triggered the interrupt. iconic behavior, no cap.

if no interrupt was found, then zero is returned 🫧

if more than one interrupt is found, then minus the first candidate is returned — that's the ✨ dramatic ✨ way of saying "there is doubt" 😭 like it's giving "idk bestie, could be this one, but also???"

also it puts the interrupt probe logic state back to its previous value 👑 the state got restored, periodt.

BUGS: when used in a module (which arguably shouldn't happen — ngl, it kinda shouldn't) nothing prevents two IRQ probe callers from overlapping 💀 and the results of that are, in the original's own words, non-optimal. so like... not great. not the slay we wanted. 🙈

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🧚 SEE ALSO 🧚

• Kernel file ./kernel/irq/autoprobe.c
• probe_irq_on(9)
• probe_irq_mask(9)

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and that's the whole page, bestie 💖 this one came from ./kernel/irq, dated October 2026 — go off, kernel docs, you ate 🌈⭐💅