radix_tree_tag_set(9)

📦 version 7.3.1, in nixpkgs unstable

💅 radix_tree_tag_set(9) — a kernel API manual moment

okay bestie, welcome to radix_tree_tag_set(9) from the Kernel API Manual. yes, the whole manual. buckle up 🎀

✨ NAME ✨

radix_tree_tag_set — set a tag on a radix tree node. that's it. that's the whole vibe check 🦋

🌸 SYNOPSIS 🌸

void * radix_tree_tag_set (struct radix_tree_root *root , unsigned long
index , unsigned int tag );

literally just copy-paste that and you're in business, no cap 💅

🎀 ARGUMENTS 🎀

  • root — the radix tree root. the main character of the operation, the place where it all begins 👑
  • index — the index key. this is which spot in the tree we're talking about, iykyk 🔑
  • tag — the tag index. the little label we're sticking on there 🏷️

💖 DESCRIPTION 💖

so here's the tea: this sets the search tag corresponding to index in the radix tree. and bestie, it doesn't stop halfway — it does it from the root all the way down to the leaf node. the whole path. obsessed with the commitment fr fr 🌈

the tag you pass must be < RADIX_TREE_MAX_TAGS. that's a hard requirement, not a suggestion, so pls respect it 🙈

it returns the address of the tagged item. so you get something back — slay ✨

ok but real talk: setting a tag on a not-present item is a bug. like, not a "haha oops" bug, an actual bug. do not do it. consider this your warning 🚨

🔥 SEE ALSO 🔥

the kernel file ./lib/radix-tree.c is where all the magic lives, and here's the whole friend group 💜

and that's the whole page, bestie!! mwah 💋 this one's brought to you by ./lib and dated October 2026 — write it in your calendar, screenshot it, frame it, whatever 🫶 💅 🎀

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