arm_cpuidle_init(9)

✨ arm_cpuidle_init ✨

okay so bestie, welcome to the Kernel API Manual 💖 this one's a lil function from the ARM kernel world and honestly she's doing a lot of quiet heavy lifting. let's get into it 🫶

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🌸 NAME 🌸

arm_cpuidle_init — literally just "Initialize cpuidle_ops for a specific cpu" 💅

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🎀 SYNOPSIS 🎀

int arm_cpuidle_init (int cpu );

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🦋 ARGUMENTS 🦋

• cpu — the cpu that's getting initialized ✨ like, this is the one you're setting up, no cap

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💜 DESCRIPTION 💜

so here's the vibe: arm_cpuidle_init initializes the cpuidle ops with the device for the cpu, and then it calls the cpu's idle initialization callback 🧚

ngl it can fail — if the underlying HW is not operational, this thing is not gonna have a good time 😭

that's the whole thing. short, sweet, main character energy 👑

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🔥 RETURN 🔥

she returns a whole lil bouquet of values depending on what went down 🌈:

• 0 — slay, success ✨
• -ENODEV — it fails to find the cpu node in the device tree 🙈
• -EOPNOTSUPP — it does not find a registered and valid cpuidle_ops for this cpu 💀
• -ENOENT — it fails to find an 'enable-method' property 🍓
• -ENXIO — the HW reports a failure or a misconfiguration 😭
• -ENOMEM — the HW report an memory allocation failure 💅

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🧚 SEE ALSO 🧚

• Kernel file ./arch/arm/kernel/cpuidle.c
• arm_cpuidle_simple_enter(9)
• arm_cpuidle_suspend(9)
• arm_cpuidle_get_ops(9)
• arm_cpuidle_read_ops(9)

go read those too, iykyk 👑

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⭐ and that's the page bestie!! this iconic lil number lives in ./arch/arm/kernel, it's dated October 2026, and it goes by arm_cpuidle_init(9) — periodt 💅💖