list_safe_reset_next(9)

📦 version 7.3.1, in nixpkgs unstable

💅 list_safe_reset_next — Kernel API Manual 🎀

okay bestie, this one's short but it's important, so pay attention. It's <pink>list_safe_reset_next</pink>, from the Kernel API Manual (section 9), and it's the little function that hits the reset button on a stale list_for_each_entry_safe loop. icon behavior only. 🦋

✨ SYNOPSIS ✨

list_safe_reset_next (pos , n , member );

yeah that's literally the whole call, no cap 🔥

🌸 ARGUMENTS 🌸

  • pos — the loop cursor from your list_for_each_entry_safe loop. it's the main character of the loop, lowkey 👑
  • n — the temporary storage buddy that list_for_each_entry_safe uses. think of it as the loop's emotional support variable 🫶
  • member — the name of the list_head inside the struct. that's the field name, exactly, no guessing 💅

💀 DESCRIPTION 💀

okay so here's the tea: list_safe_reset_next is not safe to use in general if the list might get modified concurrently — like, say, the lock is dropped somewhere in the loop body. 🚨 that's a real "not me getting a use-after-free" moment, so like, be careful.

BUT — and this is the iconic exception — it is chill if both of these are true: the cursor element (pos) is pinned in the list, and you call list_safe_reset_next after re-taking the lock and before completing the current iteration of the loop body. that exact ordering, bestie. don't freestyle it. ✨

🦋 SEE ALSO 🦋

Kernel file ./tools/include/linux/list.h, plus literally the entire list family reunion:

like, go read the whole squad, iykyk 📚

bestie warning, one more time: concurrent modification + no lock = bad vibes. pin that cursor, re-take the lock, then reset. periodt. 💅

and that's the whole page, bestie!! this lil gem came from ./tools/include/linux, dated October 2026 — slay, see you in the group chat 🎀💖🌈

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