__radix_tree_replace(9)

💖 __radix_tree_replace(9) 💖

okay so bestie, this is a page from the Kernel API Manual, and it's all about __radix_tree_replace — yes, the double-underscore one. main character energy, honestly. ✨

🌸 NAME 🌸

__radix_tree_replace — replace item in a slot. that's it, that's the job 💅

✨ SYNOPSIS ✨

void __radix_tree_replace (struct radix_tree_root *root , struct
       radix_tree_node *node , void __rcu **slot , void *item );

🎀 ARGUMENTS 🎀

• root — radix tree root 🌳
• node — pointer to tree node
• slot — pointer to slot in node
• item — new item to store in the slot. 💖

🦋 DESCRIPTION 🦋

okay so this one is for use with __radix_tree_lookup. The caller must hold tree write locked across slot lookup and replacement. not optional, bestie — hold that write lock across the lookup and the replacement, no gaps. periodt. 🔥

💜 SEE ALSO 💜

Kernel file ./lib/radix-tree.c — and the whole friend group is here:

• radix_tree_find_next_bit(9)
• radix_tree_shrink(9)
• __radix_tree_create(9)
• radix_tree_insert(9)
• __radix_tree_lookup(9)
• radix_tree_lookup_slot(9)
• radix_tree_lookup(9)
• radix_tree_replace_slot(9)
• radix_tree_iter_replace(9)
• radix_tree_tag_set(9)
• radix_tree_tag_clear(9)
• radix_tree_iter_tag_clear(9)
• radix_tree_tag_get(9)
• radix_tree_next_chunk(9)
• radix_tree_gang_lookup(9)
• radix_tree_gang_lookup_tag(9)
• radix_tree_gang_lookup_tag_slot(9)
• radix_tree_iter_delete(9)
• radix_tree_delete_item(9)
• radix_tree_delete(9)
• radix_tree_tagged(9)
• idr_preload(9)
• idr_destroy(9)

mwah 💋 source/version ./lib, dated October 2026, on the __radix_tree_replace(9) page. byeee 🫶