raw_atomic_f..._and_relaxed(9)

📦 version 7.3.1, in nixpkgs unstable

💅 raw_atomic_fetch_and_relaxed — the Kernel API Manual files 💅

okay bestie, so this page is from the Kernel API Manual (yes the whole manual, she's giving official documentation energy ✨) and it's about, like, the rawest little bit-twiddler in the atomic family. It's raw_atomic_fetch_and_relaxed(9), and no cap she's iconic.

🎀 NAME 🎀

raw_atomic_fetch_and_relaxed — atomic bitwise AND with relaxed ordering 💖

Lowkey the whole personality: she ANDs some bits, atomically, and she does not stress about ordering. Relaxed queen. Periodt.

🌸 SYNOPSIS 🌸

int raw_atomic_fetch_and_relaxed (int i , atomic_t *v );

That's the whole vibe. Two args, one int coming back out. Slay.

🦋 ARGUMENTS 🦋

  • i — an int value. Yeah, literally just "int value". She's the mask, bestie. The thing you're ANDing with.
  • v — pointer to atomic_t. This is the main character. She's the atomic variable that's gonna get updated.

✨ DESCRIPTION ✨

Atomically updates v to (v & i) with relaxed ordering. That's it, that's the function. She goes in, she does the AND, she comes back out, nobody sees her, nothing tears. 🔥

Lowkey the important part: she's safe to use in noinstr code. That's her whole niche, her whole brand. But — and I'm saying this with love — prefer atomic_fetch_and_relaxed elsewhere. This raw one is for the special cases, iykyk. 🙈

fr fr, "elsewhere" means everywhere that isn't noinstr code. Don't be out here using the raw one just for the vibes. The regular one has your back everywhere else.

👑 RETURN 👑

The original value of v — like, before the AND happened. She gives you the receipt of what she walked in with. 💅

Classic fetch-and-whatever behaviour: you get the before picture, she keeps the after picture. Bestie tax.

🌈 SEE ALSO 🌈

First up, the actual source file, the origin story:

  • Kernel file ./include/linux/atomic/atomic-arch-fallback.h

And then… okay so. Deep breath. The rest of the atomic family showed up to the group chat. Every single one. Nobody was left out and honestly? Obsessed. 🫶

okay that's the whole roster 😭 every auntie, cousin and 64-bit twin. she said "family reunion" and she MEANT it. 🍓

sign-off bestie 💖 — this page lives in ./include/linux/atomic, dated October 2026, and answers to the name raw_atomic_f..._and_relaxed(9) (yes her name got truncated in the header, she's fine, she's thriving, it's giving ellipsis main character energy 💀✨). go AND some bits responsibly. 🧚🫶

📦 where this page comes from