llist_on_list(9)

💖 llist_on_list(9) 💖

okay bestie, this is llist_on_list(9) from the Kernel API Manual, and it's a tiny little vibe check for lock-list list nodes. no cap, it's giving “is this node actually on a list or not?” energy 💅

✨ NAME ✨

llist_on_list — test if a lock-list list node is on a list 🎀

🌸 SYNOPSIS 🌸

bool llist_on_list (const struct llist_node *node );

🦋 ARGUMENTS 🦋

• node — the node to test. that's it, that's the whole assignment 💖

🔥 DESCRIPTION 🔥

so here's the tea, bestie: when a node is on a list, its ->next pointer will be NULL or some other node. it can never point to itself. periodt.

we use that fact in init_llist_node to record that a node is not on any list, and this function uses it here to test whether it is on any list. literally the whole trick, and it ate ✨

🫶 SEE ALSO 🫶

• Kernel file ./include/linux/llist.h
• init_llist_head(9)
• init_llist_node(9)
• llist_entry(9)
• member_address_is_nonnull(9)
• llist_for_each(9)
• llist_for_each_safe(9)
• llist_for_each_entry(9)
• llist_for_each_entry_safe(9)
• llist_empty(9)
• llist_add_batch(9)
• llist_add(9)
• llist_del_all(9)
• llist_del_first_init(9)

kisses bestie! source: ./include/linux · date: October 2026 · page: llist_on_list(9) 🫶💖