topology_get_acpi_cpu_tag(9)

💅 topology_get_acpi_cpu_tag(9) 💅

okay bestie, welcome to the Kernel API Manual — this one's a lil function called topology_get_acpi_cpu_tag, and honestly? it's giving "quiet main character who does one thing perfectly." 🎀

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✨ NAME ✨

topology_get_acpi_cpu_tag — find a unique topology value for a feature 🌸

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✨ SYNOPSIS ✨

int topology_get_acpi_cpu_tag (struct acpi_table_header *table ,
unsigned int cpu , int level , int flag );

like, that's the whole signature, no cap. 🫶

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✨ ARGUMENTS ✨

• table — pointer to the head of the PPTT table. yeah, the table. the big one. 👑
• cpu — the kernel logical CPU number. which lil guy are we talking about 💖
• level — a level that terminates the search. it's the stop sign, basically 🛑
• flag — a flag which terminates the search. also a stop sign, but the flag kind 🙈

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✨ DESCRIPTION ✨

so here's the vibe: you give it a CPU and a topology level, and it hands you back a unique value. that value can then be matched up to figure out which CPUs share common topological features at that level. literally matchmaking for processors 💅✨

it's not complicated, it's just specific. iykyk.

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✨ RETURN ✨

a unique value 🔥 — or -ENOENT if it can't locate the CPU 😭 (bestie is lost, no cap)

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✨ SEE ALSO ✨

kernel file ./drivers/acpi/pptt.c — plus the whole friend group:

• acpi_pptt_walk_cache(9)
• acpi_count_levels(9)
• acpi_pptt_leaf_node(9)
• acpi_find_processor_node(9)
• update_cache_properties(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)
• find_acpi_cpu_topology_hetero_id(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)

like, the whole squad showed up 🫶🌈

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and that's the page!! brought to you by ./drivers/acpi 🦋, dated October 2026 ⭐ — slay, go read the source, mwah 💖💅