hlist_replace_rcu(9)

💅 hlist_replace_rcu — like, the Kernel API Manual page you actually wanna read 🎀

okay so bestie, we're in the Kernel API Manual today and this one is genuinely a little icon. short, sweet, does exactly one thing. let's go ✨

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✨ NAME ✨

hlist_replace_rcu — swap the old entry out for the new one, no cap 🫶

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🌸 SYNOPSIS 🌸

void hlist_replace_rcu (struct hlist_node *old , struct hlist_node *new
);

like yes, that's the whole signature. two pointers, no return value, void behavior, we love a low-maintenance king 👑

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🦋 ARGUMENTS 🦋

• old — the element that's getting replaced. she's leaving the group chat 💔
• new — the new element to insert. main character energy, stepping in 🎀

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💖 DESCRIPTION 💖

so the old entry gets replaced with the new entry, and it happens atomically from the perspective of concurrent readers — that's the whole vibe. readers literally cannot tell a swap happened mid-flight, it's giving invisible sleight of hand ✨

but listen — it is the caller's responsibility to synchronize with concurrent updaters, if any. that part is on you, bestie, not on the function. don't come for her when you skipped the sync step 😭

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🧚 SEE ALSO 🧚

the rculist.h girlies, from the kernel file ./include/linux/rculist.h 👑

• list_for_each_rcu(9)
• list_tail_rcu(9)
• list_add_rcu(9)
• list_add_tail_rcu(9)
• list_del_rcu(9)
• list_bidir_del_rcu(9)
• hlist_del_init_rcu(9)
• list_replace_rcu(9)
• list_splice_rcu(9)
• __list_splice_init_rcu(9)
• list_splice_init_rcu(9)
• list_splice_tail_init_rcu(9)
• list_entry_rcu(9)
• list_first_or_null_rcu(9)
• list_next_or_null_rcu(9)
• list_for_each_entry_rcu(9)
• list_for_each_entry_srcu(9)
• list_entry_lockless(9)
• list_for_each_entry_lockless(9)
• list_for_each_entry_continue_rcu(9)
• list_for_each_entry_from_rcu(9)
• hlist_del_rcu(9)
• hlists_swap_heads_rcu(9)
• hlist_add_head_rcu(9)
• hlist_add_tail_rcu(9)
• hlist_add_before_rcu(9)
• hlist_add_behind_rcu(9)
• hlist_for_each_entry_rcu(9)
• hlist_for_each_entry_srcu(9)
• hlist_for_each_entry_rcu_notrace(9)
• hlist_for_each_entry_rcu_bh(9)
• hlist_for_each_entry_continue_rcu(9)
• hlist_for_each_entry_continue_rcu_bh(9)
• hlist_for_each_entry_from_rcu(9)

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that's the whole page, bestie, go forth and swap safely 🔥💜

mwah 💋 — sourced fresh from ./include/linux, dated October 2026, and that's the hlist_replace_rcu(9) tea, periodt 🌈⭐