irq_cpu_rmap_notify(9)

💅 irq_cpu_rmap_notify(9) — from the Kernel API Manual, bestie ✨

okay so picture this: it's a kernel API manual page, the vibes are immaculate, and this function is literally the notification girlie of the IRQ subsystem. iykyk 🎀

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🌸 NAME 🌸

irq_cpu_rmap_notify — the callback for the IRQ subsystem that fires when IRQ affinity gets updated 💖

like, when the affinity changes, she knows. no cap.

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✨ SYNOPSIS ✨

void irq_cpu_rmap_notify (struct irq_affinity_notify *notify , const
       cpumask_t *mask );

that's the whole signature, bestie — void return, two args, we move 🫶

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🦋 ARGUMENTS 🦋

• notify — a struct irq_affinity_notify that got passed along by irq/manage.c 📬 like, it literally came from there. that's the source.
• mask — the cpu mask for the new SMP affinity 🎯 so you know exactly which cpus are the main characters now.

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💀 DESCRIPTION 💀

hiii so quick heads up: this whole thing runs in workqueue context. yes, workqueue context. not interrupt context, not your girl's DMs, workqueue. write that down 📝✨

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🔥 SEE ALSO 🔥

the kernel file ./lib/cpu_rmap.c is where the family lives, and honestly the whole friend group is iconic:

• alloc_cpu_rmap(9)
• cpu_rmap_release(9)
• cpu_rmap_get(9)
• cpu_rmap_put(9)
• cpu_rmap_add(9)
• cpu_rmap_update(9)
• free_irq_cpu_rmap(9)
• irq_cpu_rmap_release(9)
• irq_cpu_rmap_remove(9)
• irq_cpu_rmap_add(9)

go read them, they ate 💅👑

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ngl this page is short but she's perfect. no notes. go forth and notify responsibly 🧚‍♀️

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and that's a wrap, bestie!! 🌈 this lil page came from ./lib, dated October 2026, and it's filed under irq_cpu_rmap_notify(9) — screenshot it, memorize it, slay the kernel 🍓💜