microcode_check(9)

✨ microcode_check(9) — Kernel API Manual ✨

okay so bestie, welcome to the microcode_check(9) page 💅 this is the kernel API manual moment where we check if any CPU capabilities changed after an update. it's giving “did anything shift while I was out?” energy, and honestly? iconic. 🦋

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💖 NAME 💖

microcode_check — check if any CPU capabilities changed after an update.

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🎀 SYNOPSIS 🎀

void microcode_check (struct cpuinfo_x86 *prev_info );

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🌸 ARGUMENTS 🌸

• prev_info — CPU capabilities stored before an update. this is the receipts from before the glow-up, bestie 🫶

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🦋 DESCRIPTION 🦋

so the microcode loader calls this cutie upon late microcode load to recheck features — but only when microcode has been updated. no extra calls for no reason, periodt.

also important: the caller holds and CPU hotplug lock. yes, literally that. keep it in mind 💀

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⭐ RETURN ⭐

None

that's it. no return value, no drama, no surprise comeback 😌

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🔥 SEE ALSO 🔥

• Kernel file ./arch/x86/kernel/cpu/common.c
• switch_gdt_and_percpu_base(9)
• store_cpu_caps(9)

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mwah 💋 this page's source/version vibe is ./arch/x86/kernel/cpu, dated October 2026, and yes — it's literally microcode_check(9). 🫶✨