rhashtable_..._insert_fast(9)

💅 rhashtable_..._insert_fast(9) — a Kernel API Manual moment 🎀

okay so bestie, buckle in, because we're reading a kernel manpage together and honestly? it's giving main character energy. this one lives in the Kernel API Manual, and the function's government name is rhashtable_lookup_get_insert_fast ✨

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🌸 NAME 🌸

rhashtable_lookup_get_insert_fast — lookup and insert object into hash table 🦋

like, it looks the thing up and shoves it in if it's not there. multitasking icon behavior, no cap.

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✨ SYNOPSIS ✨

void * rhashtable_lookup_get_insert_fast (struct rhashtable *ht , struct
rhash_head *obj , const struct rhashtable_params params );

yes it returns a void *, yes the spacing is exactly like that, i don't make the rules 💅

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🫶 ARGUMENTS 🫶

• ht — the hash table. the whole vibe container, she's the main character here 👑
• obj — pointer to the hash head inside the object. like, the little handle that lives inside your actual object 🎀
• params — the hash table parameters. the settings, the preferences, the little personality traits 🌈

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💖 DESCRIPTION 💖

so literally just like rhashtable_lookup_insert_fast, except this one is a little chatterbox that tells you what happened. here's the tea 🍓:

• if the object exists, you get the object back
• if it did not exist and the insertion was successful, you get NULL
• otherwise, you get an ERR_PTR

so yeah — read the return value, bestie, don't just assume it worked. ERR_PTR is right there waiting to humble you 😭

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💜 SEE ALSO 💜

the whole friend group, fr fr. 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)
• rhltable_insert(9)
• rhashtable_lookup_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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ok that's genuinely the whole page, there is no OPTIONS section, no EXIT STATUS, nothing else hiding. we ate and left no crumbs 🔥

and that's a wrap, bestie 🧚💜 this one comes from ./include/linux, dated October 2026 — catch you in the next man page, mwah 💋🎀