idr_remove(9)

📦 version 7.3.1, in nixpkgs unstable

💅 idr_remove — the idr_remove(9) glow-up

okay bestie, so this one lives in the Kernel API Manual, and it's genuinely one of the cleanest little functions ever. no cap. it's giving "small but mighty" energy and i'm obsessed 🎀

✨ NAME ✨

idr_remove — literally just: remove an ID from the IDR. that's it. that's the whole vibe 💖

🦋 SYNOPSIS 🦋

void * idr_remove (struct idr *idr , unsigned long id );

look at her. so simple. so iconic. take the idr handle, take the id, and boom — you get a void * back. periodt. ✨

🌸 ARGUMENTS 🌸

  • idr — your IDR handle. the main character here, fr fr 💅
  • id — the Pointer ID. the one you're tryna yeet out of there 🫶

💖 DESCRIPTION 💖

So here's the tea: idr_remove removes this ID from the IDR. that's the whole job. slay.

And if the ID was not previously in the IDR? it just returns NULL. no drama, no screaming, no crash — it's just like "girl, that was never here" 🙈

⚠️ now this part matters, so listen up: since this function modifies the IDR, the caller should provide their own locking to ensure that concurrent modification of the same IDR is not possible. that's on you, bestie. idr_remove is not doing the lock for you — she's just doing the removal. don't come for her when your race condition shows up. 💀

👑 RETURN 👑

The pointer formerly associated with this ID. the ex, basically. the one that used to be there. ✨

🌈 SEE ALSO 🌈

Kernel file ./lib/idr.c, plus the whole friend group — go say hi:

like, the entire idr/ida cinematic universe is right there. iykyk 🌟

okay that's the page!! mwah 💋 this lil rewrite comes to you straight from ./lib, dated October 2026 — so go forth, remove those IDs, and remember your locking. lowkey the most important part. bye bestie!! 🦋💜⭐

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