rht_for_each_entry_from(9)

✨ rht_for_each_entry_from(9) ✨

okay so bestie, welcome to rht_for_each_entry_from — it's a kernel macro from the rht_for_each_entry_from(9) corner of the Kernel API Manual and honestly it's giving "walk the hash chain, but start from a specific head" energy. 💅

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🌸 NAME 🌸

rht_for_each_entry_from — iterate over hash chain from given head 🦋

like literally, you point at a head and it loops you through the entries from there. no cap.

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✨ SYNOPSIS ✨

rht_for_each_entry_from (tpos , pos , head , tbl , hash , member );

yes that's the whole vibe. six args. she's a little wordy but she works. 🎀

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💖 ARGUMENTS 💖

• tpos — the type * to use as a loop cursor. that's your main character pointer, the one you actually use inside the loop. 🌟
• pos — the struct rhash_head to use as a loop cursor. the lowkey plumbing cursor, also along for the ride. 🫶
• head — the struct rhash_head to start from. this is the whole point of the macro — you begin here, not at the top of the chain. 📍
• tbl — the struct bucket_table. your bucket table, iykyk. 🪣
• hash — the hash value / bucket index. which bucket we're poking around in. 🔢
• member — name of the struct rhash_head within the hashable struct. like tell her which field is the embedded head so she can do the pointer math. 🧚

ngl, this is a macro, so all the usual "don't do weird stuff inside the loop body" energy applies. 🫣

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🦋 SEE ALSO 🦋

the whole friend group shows up here, and we're listing every single one because they all ate:

• 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(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_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)

like, the entire rhashtable extended universe. 👑

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and that's the page, bestie!! 🎀 one last thing — this one comes to you from ./include/linux, dated October 2026, so jot that down in your notes app. mwah. 💜✨🦋🌸