cpu_to_chip_id(9)

💅 cpu_to_chip_id — Kernel API Manual ✨

okay so bestie, welcome to the cutest little corner of the kernel: cpu_to_chip_id(9), straight out of the Kernel API Manual. it's a tiny one but it's iconic, i promise 🫶

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🌸 NAME 🌸

cpu_to_chip_id — Return the cpus chip-id 💖

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✨ SYNOPSIS ✨

int cpu_to_chip_id (int cpu );

like, that's the whole vibe. one function, one argument, no drama 👑

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🎀 ARGUMENTS 🎀

• cpu — The logical cpu number. that's it, that's the whole thing. the number of the cpu you're curious about 🧚

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🦋 DESCRIPTION 🦋

so what does it actually do, you ask? bestie. it returns the value of the ibm,chip-id property that corresponds to the given logical cpu number 💫 that's the whole job. main character energy, minimal effort.

and if the chip-id can not be found? 😭 it returns -1. no cap. that's the fallback, that's the safety net, that's the "sorry babe, not today" of return values.

ngl, -1 is your red flag here — if you see it, the chip-id was not found, so don't go treating it like a real id 💀

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🌈 SEE ALSO 🌈

• Kernel file ./arch/powerpc/kernel/prom.c 📁
• move_device_tree(9)
• of_get_ibm_chip_id(9)

like, go read those too, they're lowkey siblings of this function and they ate 🔥

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mwah, that's the page! sending you off with love from ./arch/powerpc/kernel — dated October 2026 — and that's the whole cpu_to_chip_id(9) moment. slay, bye bestie 💅💜