bringup_hibernate_cpu(9)

💤 bringup_hibernate_cpu(9) 💤

okay so this is a page straight out of the Kernel API Manual — no literally, that's the manual name, it's a section 9 kernel thing, bestie, we're in the big leagues now 🎀

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✨ NAME ✨

bringup_hibernate_cpu — brings up the CPU that we hibernated on. that's it. that's the whole vibe. she wakes the girlies up 💅

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🌸 SYNOPSIS 🌸

int bringup_hibernate_cpu (unsigned int sleep_cpu );

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🦋 ARGUMENTS 🦋

• sleep_cpu — the cpu we hibernated on, and the one that should get brought up. like, this is her cpu. we're waking her specifically. main character energy fr 🔥

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💖 DESCRIPTION 💖

so on some architectures — arm64 being the one called out here, ikyk — we can hibernate on any CPU. slay, flexible, we love options 🫶

but here's the plot twist 😭 on wake up, the CPU we hibernated on might be offline as a side effect of using maxcpus= for example. so you hibernated all cute and cozy and then you come back and your cpu is literally not there anymore. not her ghosting you 💀

that's the whole situation this function is here to fix.

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⭐ RETURN ⭐

0 on success, or a negative errno code. so like, zero means we ate, negative means something went wrong and it's giving error 💅

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👑 SEE ALSO 👑

• Kernel file ./kernel/cpu.c
• struct cpuhp_cpu_state(9)
• struct cpuhp_step(9)
• cpuhp_invoke_callback(9)
• cpuhp_ap_update_sync_state(9)
• cpuhp_ap_report_dead(9)
• cpuhp_ap_sync_alive(9)
• clear_tasks_mm_cpumask(9)
• cpu_device_down(9)
• notify_cpu_starting(9)
• cpu_device_up(9)
• __cpuhp_setup_state_cpuslocked(9)
• __cpuhp_remove_state_cpuslocked(9)

the whole cpu hotplug friend group honestly, go read all of them, no cap 🌈

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and that's the page!! mwah 💋 this one's living in ./kernel and it's dated October 2026, so like, future girlie behavior honestly 🧚 go wake that cpu up bestie, she's been sleeping long enough 💜