xa_empty(9)

📦 version 7.3.1, in nixpkgs unstable

💅 xa_empty(9) — like, the Kernel API Manual page, bestie 🎀

okay so picture this: you're deep in the kernel, you've got an XArray, and you just need to know — is there anything in here or is it giving empty? that's the whole gig of xa_empty(). she's a tiny little function from the (9) section of the Kernel API Manual and she ate, no cap ✨

✨ NAME ✨

xa_empty — determine if an array has any present entries 🫶

like, literally just: does this XArray have any present entries or nah? vibe check for your array 💖

🌸 SYNOPSIS 🌸

bool xa_empty (const struct xarray *xa );

yes that's the whole thing. one function, one argument, returns a bool. iconic behavior honestly 👑

🦋 ARGUMENTS 🦋

  • xa — the XArray. that's it. that's the argument. she's the XArray you're checking 💅

🌈 CONTEXT 🌈

Any context. literally any. no restrictions, no "sorry bestie you can't call this from an interrupt", none of that. you're free 🌸

⭐ RETURN ⭐

returns true if the array contains only NULL pointers 💀

that's the tea — it's true when only NULL pointers are in there. if there's anything actually present, you're getting false, sorry 😭

👑 SEE ALSO 👑

okay so this is the part where the manpage just dumps the entire XArray extended universe on you. buckle up bestie, we're going through the whole friend group 🫶

Kernel file ./include/linux/xarray.h, plus:

like I said. the whole extended universe. go read them, iykyk 💜

ngl the fact that true means "only NULL pointers" is the one thing people get twisted on, so don't let it catch you lacking 🙈

that's the page babes 💖 this little bundle of joy lives in ./include/linux and the version on this copy is dated October 2026 — go forth and vibe check those arrays 🌈✨🍓

📦 where this page comes from