rhltable_insert(9)

💖 rhltable_insert(9) — like, the kernel API manual, but make it make sense ✨

okay so bestie, you found rhltable_insert in the Kernel API Manual and you're like "what does this even do" — don't worry, I got you 🫶

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🌸 NAME 🌸

rhltable_insert — insert object into hash list table 💅

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🎀 SYNOPSIS 🎀

int rhltable_insert (struct rhltable *hlt , struct rhlist_head *list ,
const struct rhashtable_params params );

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🦋 ARGUMENTS 🦋

• hlt — your hash list table. the main character, the whole vibe container 👑
• list — pointer to the hash list head inside the object. like, the little handle that lives in your struct, iykyk 🎀
• params — the hash table parameters. the settings, the rules, the config ✨

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💜 DESCRIPTION 💜

So what actually happens when you call this? It takes the per bucket bitlock to protect against mutual mutations on the same bucket 🔒. That's the whole point — no two things stomping on the same bucket at once.

Multiple insertions may occur in parallel, unless they map to the same bucket. So like, parallel is fine, slay, but only when the buckets don't collide bestie 🌈

It is safe to call this function from atomic context. periodt, no cap 💅

And here's the fun part: it will trigger an automatic deferred table resizing if residency in the table grows beyond 70%. the table notices it's getting crowded and handles it on its own, iconic behaviour honestly 👑

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🔥 SEE ALSO 🔥

• Kernel file ./include/linux/rhashtable.h
• struct bucket_table(9)
• rht_grow_above_75(9)
• rht_shrink_below_30(9)
• rht_grow_above_100(9)
• rht_grow_above_max(9)
• rht_for_each_from(9)
• rht_for_each(9)
• rht_for_each_entry_from(9)
• rht_for_each_entry(9)
• rht_for_each_entry_safe(9)
• rht_for_each_rcu_from(9)
• rht_for_each_rcu(9)
• rht_for_each_entry_rcu_from(9)
• rht_for_each_entry_rcu(9)
• rhl_for_each_rcu(9)
• rhl_for_each_entry_rcu(9)
• rhashtable_lookup(9)
• rhashtable_lookup_fast(9)
• rhltable_lookup(9)
• rhashtable_insert_fast(9)
• rhltable_insert_key(9)
• rhashtable_lookup_insert_fast(9)
• rhashtable_lookup_get_insert_fast(9)
• rhashtable_lookup_insert_key(9)
• rhashtable_lookup_get_insert_key(9)
• rhashtable_remove_fast(9)
• rhltable_remove(9)
• rhashtable_replace_fast(9)
• rhltable_walk_enter(9)
• rhltable_free_and_destroy(9)

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and that's the whole page bestie, you ate that 💖 this one lives in ./include/linux and it's dated October 2026 — see you in the group chat, mwah 🍓🧚