drm_mm_reserve_node(9)

✨ drm_mm_reserve_node(9) ✨

okay bestie, welcome to the Kernel API Manual 💅 this one lives in drm_mm_reserve_node and it's lowkey iconic for a very specific reason — let's get into it 🫶

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🌸 NAME 🌸

drm_mm_reserve_node — insert an pre-initialized node ✨

(yes, "an pre-initialized", that's literally how it's written, we do not fix the grammar of the ancestors 💀)

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🦋 SYNOPSIS 🦋

int drm_mm_reserve_node (struct drm_mm *mm , struct drm_mm_node *node );

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🎀 ARGUMENTS 🎀

• mm — the drm_mm allocator you're inserting the node into, bestie. that's the whole vibe.
• node — the drm_mm_node to insert. main character energy fr.

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💖 DESCRIPTION 💖

so this function inserts an already set-up drm_mm_node into the allocator 🧚 the way that it works is: start, size and color must be set by the caller — like, you have to do that part yourself, no cap. all other fields must be cleared to 0. literally all of them. zero. nada. don't be out here leaving stale data in there 🙈

and why is this useful? because it lets you initialize the allocator with preallocated objects — objects which must be set-up before the range allocator can be set-up 🫶 the classic example is taking over a firmware framebuffer. it's giving "the object was here first, the allocator is just catching up" ✨

⚠️ reminder for the girlies: caller sets start, size, color. everything else = 0. that's it, that's the rule 👑

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⭐ RETURN ⭐

• 0 on success — slay 💅
• -ENOSPC if there's no hole where node is — like, no room, no vibe, sorry bestie 😭

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/drm_mm.c Overview(9)
• DECLARE_NEXT_HOLE_ADDR(9)
• drm_mm_insert_node_in_range(9)
• drm_mm_remove_node(9)
• lru scan roster(9)
• drm_mm_scan_init_with_range(9)
• drm_mm_scan_add_block(9)
• drm_mm_scan_remove_block(9)
• drm_mm_scan_color_evict(9)
• drm_mm_init(9)
• drm_mm_takedown(9)
• drm_mm_print(9)

like honestly, go read all of them, they're all connected iykyk 🔥

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💜 sign-off 💜

and that's the tea, bestie 🍓 this page came straight out of ./drivers/gpu/drm and it's dated October 2026 — so like, future vibes ✨ go forth and reserve those nodes, you absolute icon 👑💖