early_init_d...le_mem_range(9)

💅 early_init_d...le_mem_range(9) — a Kernel API Manual moment

ok so bestie, welcome to the Kernel API Manual ✨ — yes, the manual name is literally in the title line, we're being fancy today. this page is about one little function and honestly she's serving "yes I'm short, and?" energy 🎀

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🌸 NAME 🌸

early_init_dt_check_for_usable_mem_range — Decode usable memory range location from flat tree 🦋

like, that's the whole thing. she decodes where the usable memory range lives, straight outta the flat tree. no cap 💜

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✨ SYNOPSIS ✨

void early_init_dt_check_for_usable_mem_range (void );

look at her. returns void, takes nothing. icon behavior 💅

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🫶 ARGUMENTS 🫶

• void — no arguments. that's it, that's the whole list. she said "I need nothing from you" and honestly? main character energy 👑

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🔥 SEE ALSO 🔥

ok this is the part where the whole friend group shows up, so let me introduce everyone 🎀 — and fr fr, these all live in the Kernel file ./drivers/of/fdt.c:

• unflatten_dt_nodes(9)
• __unflatten_device_tree(9)
• of_fdt_unflatten_tree(9)
• early_init_fdt_scan_reserved_mem(9)
• early_init_fdt_reserve_self(9)
• of_scan_flat_dt(9)
• of_scan_flat_dt_subnodes(9)
• of_get_flat_dt_subnode_by_name(9)
• of_fdt_is_compatible(9)
• of_flat_dt_is_compatible(9)
• of_flat_dt_match_machine(9)
• early_init_dt_check_for_initrd(9)
• early_init_dt_check_for_elfcorehdr(9)
• early_init_dt_check_kho(9)
• unflatten_device_tree(9)
• unflatten_and_copy_device_tree(9)

that's sixteen (16) whole functions. the way she keeps her circle tight but also huge at the same time 😭💖

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lowkey a reminder: every single one of those is written exactly like that, parentheses and (9) and all — don't be out here paraphrasing the girlies 🙈

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and that's the page!! 🧚‍♀️ mwah 💋 — this lil masterpiece is brought to you by the source path ./drivers/of, dated October 2026, and yeah the header up there is the truncated early_init_d...le_mem_range(9) because apparently we ran out of room on the page title and just vibed with it 🎀✨ bye bestie! 💜