cpuidle_cou...ister_device(9)

💅 cpuidle_cou...ister_device(9) — a whole vibe

okay so bestie, welcome to the Kernel API Manual ✨ this one's a lil page about cpuidle_coupled_register_device, and honestly it's giving "quiet little helper function that does a LOT behind the scenes." let's get into it 🫶

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🌸 NAME 🌸

cpuidle_coupled_register_device — literally just registers a coupled cpuidle device. that's the whole job. iconic behavior, no notes 💅

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✨ SYNOPSIS ✨

int cpuidle_coupled_register_device (struct cpuidle_device *dev );

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🎀 ARGUMENTS 🎀

• dev — a struct cpuidle_device for the current cpu. like, the cpu you're on right now. that one. 🖥️✨

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🦋 DESCRIPTION 🦋

so the way this works is 👏 it gets called from cpuidle_register_device, right, and its whole moment is handling coupled idle init. 🌈

what it actually does: it finds the cpuidle_coupled struct for this particular set of coupled cpus — or, if none exists yet, it just 🪄 creates one. no cap. if there's no struct, there's a struct now. she provides. 👑

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🔥 SEE ALSO 🔥

the whole friend group, fr fr — go read these too:

• Kernel file ./drivers/cpuidle/coupled.c
• Coupled cpuidle states(9)
• struct cpuidle_coupled(9)
• cpuidle_coupled_parallel_barrier(9)
• cpuidle_state_is_coupled(9)
• cpuidle_coupled_state_verify(9)
• cpuidle_coupled_set_ready(9)
• cpuidle_coupled_set_not_ready(9)
• cpuidle_coupled_no_cpus_ready(9)
• cpuidle_coupled_cpus_ready(9)
• cpuidle_coupled_cpus_waiting(9)
• cpuidle_coupled_no_cpus_waiting(9)
• cpuidle_coupled_get_state(9)
• cpuidle_coupled_poke(9)
• cpuidle_coupled_poke_others(9)
• cpuidle_coupled_set_waiting(9)
• cpuidle_coupled_set_not_waiting(9)
• cpuidle_coupled_set_done(9)
• cpuidle_coupled_clear_pokes(9)
• cpuidle_enter_state_coupled(9)
• cpuidle_coupled_unregister_device(9)
• cpuidle_coupled_prevent_idle(9)
• cpuidle_coupled_allow_idle(9)

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ngl bestie, this page is short but she's load-bearing. coupled cpuidle does not work without her. treat her with respect 💜

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k that's the tea ☕ this one lives in ./drivers/cpuidle, it's from October 2026, and it's part of the Kernel API Manual — mwah, go read the coupled.c file, ily, bye 🍓🧚💖