find_acpi_cp...gy_hetero_id(9)

💅 find_acpi_cpu_topology_hetero_id — NAME ✨

okay so bestie, we're in the Kernel API Manual today and the function we're stanning is find_acpi_cpu_topology_hetero_id — literally just Get a core architecture tag 🏷️ no cap, that's the whole vibe.

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🌸 SYNOPSIS 🌸

int find_acpi_cpu_topology_hetero_id (unsigned int cpu);

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🎀 ARGUMENTS 🎀

• cpu — the Kernel logical CPU number, iykyk 🖥️ that's the one you're asking about.

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🦋 DESCRIPTION 🦋

So what this icon actually does: it determines a unique heterogeneous tag for the given CPU 💫. And fr fr, CPUs with the same implementation should have matching tags — like, they're matching, it's giving soulmate energy 🫶.

The returned tag can be used to group peers with identical implementation. basically a little friend group of identical cores 👯‍♀️.

The search terminates when a level is found with the identical implementation flag set or we reach a root node 🌳 — whichever comes first, she's done.

⚠️ lowkey important caveat: due to limitations in the PPTT data structure, there may be rare situations where two cores in a heterogeneous machine may be identical, but won't have the same tag 😭. not her fault, it's the data structure's fault 💀.

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🔥 RETURN 🔥

• -ENOENT if the PPTT doesn't exist, or the CPU cannot be found 🚫 (sad, but true).
• Otherwise returns a value which represents a group of identical cores similar to this CPU ✨👑

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⭐ SEE ALSO ⭐

Kernel file ./drivers/acpi/pptt.c — she's the main character of the source, and here's her whole entourage:

• acpi_pptt_walk_cache(9)
• acpi_count_levels(9)
• acpi_pptt_leaf_node(9)
• acpi_find_processor_node(9)
• update_cache_properties(9)
• topology_get_acpi_cpu_tag(9)
• check_acpi_cpu_flag(9)
• acpi_get_cache_info(9)
• cache_setup_acpi(9)
• acpi_pptt_cpu_is_thread(9)
• find_acpi_cpu_topology(9)
• find_acpi_cpu_topology_package(9)
• find_acpi_cpu_topology_cluster(9)
• acpi_pptt_get_child_cpus(9)
• acpi_pptt_get_cpus_from_container(9)
• find_acpi_cache_level_from_id(9)
• acpi_pptt_get_cpumask_from_cache_id(9)

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🌈 bestie, everything in this page lives over in ./drivers/acpi — that's the directory, the home base, the whole address 💖 — and this edition is dated October 2026. stay slay, go read your topology tags, periodt 👑🎀💜