hlist_nulls_replace_rcu(9)

✨ hlist_nulls_replace_rcu 💅

okay so bestie, this one is a kernel API manual page for hlist_nulls_replace_rcu — and yes, it's literally about swapping one entry for another in a RCU-protected hlist_nulls. No cap, it's a small function but the rules around it are everything. 🎀

---

🌸 NAME 🌸

hlist_nulls_replace_rcu — replace an old entry by a new one 💖

🦋 SYNOPSIS 🦋

void hlist_nulls_replace_rcu (struct hlist_nulls_node *old , struct
       hlist_nulls_node *new );

✨ ARGUMENTS ✨

• old — the element to be replaced 👋
• new — the new element to insert, main character energy incoming 💅

👑 DESCRIPTION 👑

Replace the old entry with the new one in a RCU-protected hlist_nulls, while permitting racing traversals. 🏃‍♀️💨

Okay so the caller must take whatever precautions are necessary (such as holding appropriate locks) to avoid racing with another list-mutation primitive, such as hlist_nulls_add_head_rcu or hlist_nulls_del_rcu, running on this same list. Do not skip this part, bestie. 😭

However, it is perfectly legal to run concurrently with the _rcu list-traversal primitives, such as hlist_nulls_for_each_entry_rcu. Slay. ✨

traduction du vibe: swapping stuff in? protect yourself from other mutators. Reading the list while someone swaps? that's totally fine, go off. 🫶

💜 SEE ALSO 💜

Kernel file ./include/linux/rculist_nulls.h

• hlist_nulls_del_init_rcu(9)
• hlist_nulls_first_rcu(9)
• hlist_nulls_next_rcu(9)
• hlist_nulls_pprev_rcu(9)
• hlist_nulls_del_rcu(9)
• hlist_nulls_add_head_rcu(9)
• hlist_nulls_add_tail_rcu(9)
• hlist_nulls_replace_init_rcu(9)
• hlist_nulls_for_each_entry_rcu(9)
• hlist_nulls_for_each_entry_safe(9)

---

okay that's the whole page, hope you're obsessed 💖 this comes from ./include/linux and it's dated October 2026 — catch you in the kernel sources, bestie! 🦋🌸💫