batadv_hashdata_compare_cb(9)

💅 batadv_hashdata_compare_cb(9) — like, the Kernel API Manual edition 🎀

okay so bestie, gather round, because this one is short but it's literally the little bouncer at the door of every hash bucket in batman-adv ✨

---

✨ NAME ✨

batadv_hashdata_compare_cb — the hash element comparison callback 🦋

(yes that's the whole name, yes it's a mouthful, no we're not shortening it, it's iconic 💅)

---

🌸 SYNOPSIS 🌸

bool batadv_hashdata_compare_cb (const struct hlist_node *node , const
void *key );

---

🎀 ARGUMENTS 🎀

• node — the hlist node of the element that's currently chillin' in the bucket 🫶 like it's already seated, it's already got its little spot, and now we're checking its vibe
• key — an opaque payload that we compare the node's key against 👀 opaque meaning we do NOT peek inside, we do NOT ask questions, we just hand it over and let the callback do its thing 🙈

---

💖 DESCRIPTION 💖

Compare a hash element by its keys. that's it. that's the whole job 🧚

it's giving "small but crucial" energy honestly — this is the callback that decides whether two elements are the same element, and everything downstream is gonna trust that answer 🔥

---

⭐ RETURN ⭐

• true — both elements are considered equal 💖 slay, they match
• false — nope, not equal, different elements, moving on 💀

---

🌈 SEE ALSO 🌈

• Kernel file ./net/batman-adv/hash.h — the whole file, the source of truth, go read it iykwys 📖
• batadv_hashdata_choose_cb(9)
• batadv_hashdata_free_cb(9)
• struct batadv_hashtable(9)
• batadv_hash_add(9)
• batadv_hash_remove(9)

like... the whole hash friend group honestly, they all show up together 👑

---

ngl if you got here looking for drama, there is none — just a boolean, two arguments, and zero cap 🫶 but every hash table in batman-adv is lowkey relying on this being correct, so, y'know. no pressure bestie 😭

---

and that's the page!! source/version is from ./net/batman-adv and it's dated October 2026 — mwah, go touch some hash buckets 💜🎀🌸