cpuidle_coup...prevent_idle(9)

💅 cpuidle_coupled_prevent_idle(9) — from the Kernel API Manual, bestie ✨

okay so like, welcome to the group chat, this is Kernel API Manual territory and we're talking about cpuidle_coupled_prevent_idle(9) 🎀 yes the truncated header says cpuidle_coup...prevent_idle(9) but we know her full name, periodt.

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✨ NAME ✨

cpuidle_coupled_prevent_idle — literally stops cpus from sliding into a coupled state 🛑💅

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🌸 SYNOPSIS 🌸

void cpuidle_coupled_prevent_idle (struct cpuidle_coupled *coupled );

bestie it returns nothing (void), it just does the thing 😌

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🦋 ARGUMENTS 🦋

• coupled — the struct coupled that holds the cpu that's changing state. like, this is the little container of the crew, iykyk 🫶

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🔥 DESCRIPTION 🔥

so what she does: disables coupled cpuidle on a coupled set of cpus. no cap, that's the whole vibe.

it's used to make sure that cpu_online_mask doesn't change while cpus are coordinating coupled idle — the way that mask has to stay exactly the same during that coordination is giving main character energy 👑 like don't touch it, don't move it, don't breathe on it 🧚

fr fr, this is a coordination-safety thing. the mask stays put while the cpus do their coupled idle choreography 💀

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💜 SEE ALSO 💜

• 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_register_device(9)
• cpuidle_coupled_unregister_device(9)
• cpuidle_coupled_allow_idle(9)

like, the whole coupled.c friend group honestly 🌈 obsessed with how many of them there are.

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okay that's the page bestie 🍓 this gem lives in ./drivers/cpuidle, dated October 2026, and it's out here being cpuidle_coup...prevent_idle(9) in the Kernel API Manual ✨ slay, go read cpuidle_coupled_allow_idle(9) next, mwah 💖🎀🦋