STRUCT DRM_MM_NODE(9)

🎀 STRUCT DRM_MM_NODE(9) 🎀

okay bestie, welcome to the struct drm_mm_node(9) page from the Kernel API Manual — yes, the section 9 one, the iconic one. this is the whole allocated-block-in-the-DRM-allocator of it all, and honestly? it's giving legend behavior. let's get into it 💅

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✨ NAME ✨

struct drm_mm_node — the allocated block in the DRM allocator, aka the little guy that holds down a chunk of your address space 💖

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🌸 SYNOPSIS 🌸

struct drm_mm_node {
    unsigned long color;
    u64 start;
    u64 size;
 };

like look at her. three members. no notes. pristine. ✨

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🦋 MEMBERS 🦋

• color — an opaque driver-private tag. that's it, that's the whole thing — the allocator does not care what you put in here, it's yours, it's a vibe, it's a lil sticky note your driver leaves for itself 🎀
• start — the start address of the allocated block 📍
• size — the size of the allocated block 📏

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👑 DESCRIPTION 👑

so this struct represents an allocated block inside a drm_mm allocator. slay.

big important caveat incoming 🚨 except for pre-reserved nodes that get inserted using drm_mm_reserve_node, the structure is entirely opaque and you should only ever access it through the provided functions. no peeking under the hood, no poking at fields directly, none of that. iykyk 🙈

and since the allocation of these nodes is handled entirely by the driver, you can embed them. yes bestie, embed them. they're flexible like that 🫶

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🌈 SEE ALSO 🌈

go read these next, no cap, they're all connected:

• the Kernel file ./include/drm/drm_mm.h
• enum drm_mm_insert_mode(9)
• struct drm_mm(9)
• struct drm_mm_scan(9)
• drm_mm_node_allocated(9)
• drm_mm_initialized(9)
• drm_mm_hole_follows(9)
• drm_mm_hole_node_start(9)
• drm_mm_hole_node_end(9)
• drm_mm_nodes(9)
• drm_mm_for_each_node(9)
• drm_mm_for_each_node_safe(9)
• drm_mm_for_each_hole(9)
• drm_mm_insert_node_generic(9)
• drm_mm_insert_node(9)
• drm_mm_clean(9)
• drm_mm_for_each_node_in_range(9)
• drm_mm_scan_init(9)

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💀 reminder bestie: opaque means opaque. the only exception is pre-reserved nodes inserted via drm_mm_reserve_node. everything else goes through the provided functions. periodt.

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and that's the page!! sourced straight from ./include/drm, dated October 2026, and filed under struct drm_mm_node(9). tysm for reading, go allocate responsibly, mwah 💜🧚‍♀️