acpi_get_cpu_uid(9)

🎀 NAME 🎀

acpi_get_cpu_uid(9) is the page title, and it lives in the Kernel API Manual — manual name folded in near the top, bestie, no header line copy-paste needed 💖

The function itself is acpi_get_cpu_uid, and the official one-liner is literally: Get ACPI Processor UID of from MADT table. Yes, “of from” is in there; we are preserving the original’s little quirk, no edits, periodt.

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✨ SYNOPSIS ✨

int acpi_get_cpu_uid (unsigned int cpu , u32 *uid );

That’s the whole signature, character-for-character, no remix 🫶

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💅 ARGUMENTS 💅

• cpu — Logical CPU number (0-based). Like the CPU’s lil index, bestie.
• uid — Pointer to store ACPI Processor UID. This is where the UID gets parked.

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🫶 RETURN 🫶

Here’s the return vibe check:

• 0 on success (ACPI Processor ID stored in *uid). Slay.
• -EINVAL if CPU number is invalid or out of range. Not the vibe.
• -ENODEV if ACPI Processor UID for the CPU is not found. Literally missing.

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🌈 SEE ALSO 🌈

The original points you at:

• Kernel file ./include/linux/acpi.h
• pxm_to_online_node(9)
• struct acpi_probe_entry(9)

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okay bye ily 💖 cute little sign-off: this page’s source/version is ./include/linux, it’s dated October 2026, and we’re still talking about acpi_get_cpu_uid(9) — no cap, that’s the footer folded in 🎀✨