acpi_pptt_leaf_node(9)

💅 acpi_pptt_leaf_node(9) — like, the Kernel API Manual page bestie 🌸

okay so listen. this is acpi_pptt_leaf_node(9) from the Kernel API Manual, and honestly? it's a tiny little function doing one very specific vibe check on your PPTT table. let's get into it 🎀

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✨ NAME ✨

acpi_pptt_leaf_node — given a processor node, determine if it's a leaf 🍃

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✨ SYNOPSIS ✨

int acpi_pptt_leaf_node (struct acpi_table_header *table_hdr , struct
       acpi_pptt_processor *node );

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✨ ARGUMENTS ✨

• table_hdr — pointer to the head of the PPTT table. like, the very beginning of it 🫶
• node — the node being passed in, which we're gonna check to see if it's a leaf 👑

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✨ DESCRIPTION ✨

so what this does is determine if the *node parameter is a leaf node — and the way it does that is by iterating the PPTT table, looking for nodes which reference it. that's it. that's the whole thing. a little search party for anyone pointing at your node 🔍✨

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✨ RETURN ✨

• 0 — if we find a node referencing the passed node (or if there's a table error 😭)
• 1 — if we don't

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✨ SEE ALSO ✨

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

• acpi_pptt_walk_cache(9)
• acpi_count_levels(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)
• 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)

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bestie this one is genuinely so short, don't overthink it. leaf or not leaf, 0 or 1, periodt 💅

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that's the whole page!! from ./drivers/acpi, dated October 2026, manual section 9 — mwah, take care, go read the other seventeen now 😭💖🦋