free_irq_cpu_rmap(9)

💅 free_irq_cpu_rmap(9) — the Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual and it's literally about tidying up after yourself, which honestly? growth. ✨

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🌸 NAME 🌸

free_irq_cpu_rmap — free a CPU affinity reverse-map used for IRQs

no cap, that's the whole vibe: you built a reverse-map so your IRQs know which CPUs are their faves, and now you're done, so you give it back. 🫶

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✨ SYNOPSIS ✨

void free_irq_cpu_rmap (struct cpu_rmap *rmap );

that's it. one function, one pointer, zero drama. 💅

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🦋 ARGUMENTS 🦋

• rmap — the reverse-map you got from alloc_irq_cpu_map, or NULL. yep, NULL is allowed, so you don't have to do a lil if dance before calling her. 🙈

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💖 DESCRIPTION 💖

so here's the tea ☕: this frees the reverse-map. that's the main character move.

but — and this is the important bit, bestie, don't skip it — it must be called in process context, and it must happen before freeing the IRQs. that's the rule. not me being dramatic, that's literally the requirement. 😭

🚨 rewind that: process context. before you free the IRQs. get the order wrong and that's a vibe check you do NOT want to fail.

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🌈 SEE ALSO 🌈

the whole friend group, in the order they showed up:

• Kernel file ./lib/cpu_rmap.c
• alloc_cpu_rmap(9)
• cpu_rmap_release(9)
• cpu_rmap_get(9)
• cpu_rmap_put(9)
• cpu_rmap_add(9)
• cpu_rmap_update(9)
• irq_cpu_rmap_notify(9)
• irq_cpu_rmap_release(9)
• irq_cpu_rmap_remove(9)
• irq_cpu_rmap_add(9)

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okay that's the page!! 🧚‍♀️ this lil legend lives in ./lib and it's dated October 2026, and the manual fairy stamped free_irq_cpu_rmap(9) right there on the bottom line so you always know who you're talking to. go free that rmap, queen 👑💜