w1_netlink_setup_msg(9)

✨ NAME ✨

w1_netlink_setup_msg — prepare to write block->msg 💖

okay so we’re in the Kernel API Manual, and this page is the w1_netlink_setup_msg(9) moment. It’s all about preparing to write block->msg — slay 🎀

✨ SYNOPSIS ✨

void w1_netlink_setup_msg (struct w1_cb_block *block , u32 ack );

✨ ARGUMENTS ✨

• block — the block you’re operating on, bestie 💅
• ack — determines if cn can be reused 👑

✨ DESCRIPTION ✨

So here’s the tea: block->cn gets set up with the correct ack, and it advances if needed. Periodt 💖

Now the important bit, no cap: block->cn->len does not include space for block->msg. And block->msg advances but remains uninitialized — like, it moves but doesn’t get initialized, which is giving “left on read” energy 😭

✨ SEE ALSO ✨

Kernel file ./drivers/w1/w1_netlink.c, plus these besties:

• w1_reply_len(9)
• w1_reply_make_space(9)
• w1_netlink_send_error(9)
• w1_netlink_send(9)

mwah 💋 that’s the page — source/version: ./drivers/w1, dated October 2026, and it’s w1_netlink_setup_msg(9) all the way down 🫶✨