smp_startup_cpu(9)

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

okay so this is <pink>smp_startup_cpu</pink> from the Kernel API Manual, and it's literally the function that gets a cpu up and running. short king of a man page, but we move. ✨

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🌸 NAME 🌸

smp_startup_cpu — start the given cpu. that's it, that's the whole vibe. 💅

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🦋 SYNOPSIS 🦋

int smp_startup_cpu (unsigned int lcpu );

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🎀 ARGUMENTS 🎀

• lcpu — honestly? <purple>-- undescribed --</purple>. the docs said nothing, she's a mystery, we simply do not know. 🙈 (no cap, that's verbatim what the page says, don't come for me)

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✨ DESCRIPTION ✨

so there's this thing at boot time: for the primary threads that were started from Open Firmware, there is nothing to do. like, zero tasks, she's already seated, main character energy from the jump. 🫶

for anything else, you call RTAS with the appropriate start location. that's the whole job. iykyk. 🔥

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⭐ RETURN ⭐

• 0 — failure 💀
• 1 — success 👑

(and yes bestie, that's the real order, 0 is the sad one here. read it twice, i had to.)

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🌈 SEE ALSO 🌈

• Kernel file ./arch/powerpc/platforms/pseries/smp.c — go read the source, it's giving lore ✨

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and that's the page!! 🦋 this lil icon came to you from the source/version ./arch/powerpc/platforms/pseries, dated October 2026 — mwah, stan, periodt. 💖🎀