memblock_mark_mirror(9)

💅 memblock_mark_mirror(9)

okay so bestie, welcome to the Kernel API Manual — this one's memblock_mark_mirror(9) and it's honestly a little legend. it does exactly one thing and it does it slayfully: tags a chunk of your physical memory with the MEMBLOCK_MIRROR flag. that's it. that's the whole vibe. 🪞✨

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✨ SYNOPSIS ✨

int __init_memblock memblock_mark_mirror (phys_addr_t base , phys_addr_t size );

like, look at that signature. __init_memblock, two phys_addr_ts, returns an int. clean. minimal. main character energy fr fr. 🎀

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🌸 ARGUMENTS 🌸

• base — the base phys addr of the region 👑 (yes, the physical address, not some virtual nonsense, keep up bestie)
• size — the size of the region 📏 (how big the vibe is, basically)

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💖 RETURN 💖

• 0 on success 🥳
• -errno on failure 😭 (so like, negative errno value, not "minus errno" as a concept — standard kernel sadness protocol)

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🦋 SEE ALSO 🦋

so there's a whole friend group here and you should lowkey meet all of them. first up, the source itself lives in the kernel file ./mm/memblock.c, and there's a memblock overview(9) that's basically the group chat pinned message:

• __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_free(9)
• memblock_phys_free(9)
• memblock_setclr_flag(9)
• memblock_mark_hotplug(9)
• memblock_clear_hotplug(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)

ngl that's a lot of besties but they're all iconic in their own way, go say hi 💜

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ok genuine reminder before you go: this page is filed under ./mm, dated October 2026, and its title is memblock_mark_mirror(9) — screenshot it, cite it, whatever, just don't lose the receipts 🫶 slay and stay marked 🌈⭐💅