memblock_free(9)

💖 memblock_free(9) 💖

okay so bestie, welcome to the Kernel API Manual — this one's memblock_free(9) and it's literally the cleanup crew of early boot memory 🧹✨

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✨ NAME ✨

memblock_free — free a boot memory allocation 🫶

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🌸 SYNOPSIS 🌸

void __init_memblock memblock_free (void *ptr , size_t size );

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🎀 ARGUMENTS 🎀

• ptr — the starting address of the boot memory allocation 👉📍
• size — the size of the boot memory block, in bytes 📏

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🦋 DESCRIPTION 🦋

So this is the glow-up-reversal function: it frees a boot memory block that was previously allocated by the memblock_alloc_xx API 💅✨

And here's the tea — if you call it after the buddy allocator is available, the memory gets released to the buddy allocator. the timing matters, bestie, that's the whole vibe check 👑🔥

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🌈 SEE ALSO 🌈

Like, the whole memblock friend group 🫶💜:

• Kernel file ./mm/memblock.c memblock overview(9)
• __memblock_find_range_bottom_up(9)
• __memblock_find_range_top_down(9)
• memblock_find_in_range_node(9)
• memblock_find_in_range(9)
• memblock_discard(9)
• memblock_double_array(9)
• memblock_merge_regions(9)
• memblock_insert_region(9)
• memblock_add_range(9)
• memblock_add_node(9)
• memblock_add(9)
• memblock_validate_numa_coverage(9)
• memblock_isolate_range(9)
• memblock_phys_free(9)
• memblock_setclr_flag(9)
• memblock_mark_hotplug(9)
• memblock_clear_hotplug(9)
• memblock_mark_mirror(9)
• memblock_mark_nomap(9)
• memblock_clear_nomap(9)
• memblock_reserved_mark_noinit(9)
• memblock_reserved_mark_kern(9)
• memblock_mark_kho_scratch(9)
• memblock_clear_kho_scratch(9)
• __next_mem_range(9)
• __next_mem_range_rev(9)
• memblock_set_node(9)
• memblock_alloc_range_nid(9)
• memblock_phys_alloc_range(9)
• memblock_phys_alloc_try_nid(9)
• memblock_alloc_internal(9)
• memblock_alloc_exact_nid_raw(9)
• memblock_alloc_try_nid_raw(9)
• memblock_alloc_hugetlb(9)
• memblock_alloc_try_nid(9)
• __memblock_alloc_or_panic(9)
• memblock_estimated_nr_free_pages(9)
• memblock_is_region_memory(9)
• memblock_is_region_reserved(9)
• memblock_free_all(9)
• reserve_mem_find_by_name(9)
• reserve_mem_release_by_name(9)

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and that's the whole page, bestie 💀 no cap, that's all of it. this lil baddie comes from ./mm, stamped October 2026, and it goes by the name memblock_free(9) — periodt 💅🎀🌺