mce_threshold_create_device(9)

💅 mce_threshold_create_device(9) 💅

okay so bestie, welcome to the Kernel API Manual entry for mce_threshold_create_device — yes that's a whole mouthful, no I will not be shortening it, it's iconic and we respect it. ✨

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🌸 NAME 🌸

mce_threshold_create_device — literally creates the per-CPU MCE threshold device. that's the whole vibe. per-CPU. threshold. device. periodt. 🎀

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🦋 SYNOPSIS 🦋

void mce_threshold_create_device (unsigned int cpu );

that's it, that's the signature. void, so it's not handing you anything back — it just does the thing and leaves. main character energy fr fr. 👑

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💖 ARGUMENTS 💖

• cpu — the plugged in CPU. that's it, that's the one argument. it's the CPU that just got plugged in, and honestly? good for it. 🫶

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🧚 DESCRIPTION 🧚

okay so what does this actually do: it creates directories and files for all valid threshold banks. all of them. every valid one. no half measures. 💅

now for the lore — this function gets invoked from the CPU hotplug callback which was installed in mcheck_init_device. iykyk. 🔥

the invocation happens in context of the hotplug thread running on cpu. so like, that specific cpu's thread, not some random one. keep up bestie. 💀

and the callback itself is invoked on all CPUs which are online when the callback is installed, or during a real hotplug event. both scenarios, no cap. 🌈

ngl this one's short but every word is doing its job. no filler, all slay. ⭐

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🍓 SEE ALSO 🍓

• Kernel file ./arch/x86/kernel/cpu/mce/amd.c — go read it, it's giving source code realness. 🦋

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okay that's the whole page, you made it to the end, I'm so proud 🥹💜 — this little masterpiece lives in ./arch/x86/kernel/cpu/mce, it's dated October 2026, and it's the mce_threshold_create_device(9) page. mwah. 💋✨🎀