radix_tree_...kup_tag_slot(9)

📦 version 7.3.1, in nixpkgs unstable

💅 radix_tree_gang_lookup_tag_slot(9) — the Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual (yes, the (9) section, we're in kernel-land now 🌸) and it's all about radix_tree_gang_lookup_tag_slot and honestly? she's a baddie. let's get into it ✨

✨ NAME ✨

radix_tree_gang_lookup_tag_slot — perform multiple slot lookup on a radix tree based on a tag 🦋

like, you're grabbing a whole gang of slots (not just one, we're extra here) out of a radix tree, and the filter is a tag. very main character energy, no cap 💅

🔥 SYNOPSIS 🔥

unsigned int radix_tree_gang_lookup_tag_slot (const struct
       radix_tree_root *root , void __rcu ***results , unsigned long
       first_index , unsigned int max_items , unsigned int tag );

that triple-pointer ***results is not a typo bestie, she's real, she's iconic, she's giving pointer inception 💀

🌈 ARGUMENTS 🌈

  • root — radix tree root. the actual tree you're digging through, your starting point, your home base 🏡
  • results — where the results of the lookup are placed. this is the lil basket you're collecting your findings in 🧺
  • first_index — start the lookup from this key. you're not starting from the beginning, you're picking up from here 👑
  • max_items — place up to this many items at *results. a hard cap, a limit, a "know when to stop" moment 🛑
  • tag — the tag index (< RADIX_TREE_MAX_TAGS). important!! it's gotta be less than RADIX_TREE_MAX_TAGS or like, don't 🙈

💖 DESCRIPTION 💖

so what she does: Performs an index-ascending scan of the tree for present items which have the tag indexed by tag set. 🦋

read that again. index-ascending. she goes up, in order, scanning the tree, and she only picks up the present items that have that tag set. picky? no. selective. there's a difference 💅

then she Places the slots at *results — like, the actual slots, not just the items, okay, that's important — and returns the number of slots which were placed at *results. so the return value is literally "how many did I find and put in your basket" 🧺✨ count them, that's your number, periodt.

🫶 SEE ALSO 🫶

the whole friend group, fr fr. first up, the Kernel file ./lib/radix-tree.c — that's where she lives, that's her address 🏠 — and then all her mutuals:

ngl that's a lot of friends but she knows every single one of them by name 😭💜

a lil vibe check before you go: tag has to be < RADIX_TREE_MAX_TAGS. that's not a suggestion, that's the rule. respect it 🙈

and that's the page!! sign-off time 🎀 — this came out of the ./lib source, dated October 2026, and it's the radix_tree_...kup_tag_slot(9) page, so yeah, the title got a lil truncated in the header and honestly she ate anyway 💅✨ go forth and gang-lookup, bestie 🦋💖

📦 where this page comes from