raw_atomic64_fetch_and(9)

📦 version 7.3.1, in nixpkgs unstable

💅 raw_atomic64_fetch_and — Kernel API Manual

okay so bestie, welcome to section 9 of the Kernel API Manual — you're here for raw_atomic64_fetch_and(9) and honestly? she's a baddie. tiny page, huge energy. let's get into it 🫶

🌸 NAME 🌸

raw_atomic64_fetch_and — atomic bitwise AND with full ordering

like, she does a bitwise AND and she does it atomically and she does it with full ordering. triple threat. main character energy fr 💅

✨ SYNOPSIS ✨

s64 raw_atomic64_fetch_and (s64 i , atomic64_t *v );

that's it. that's the whole vibe check. two arguments, one s64 back. slay.

🎀 ARGUMENTS 🎀

  • i — an s64 value. yes, that's the whole description. she's a value. that's her job. it's giving minimalism ✨
  • v — pointer to atomic64_t. this is the girl getting ANDed. she's a pointer, so like, handle with care 💖

🦋 DESCRIPTION 🦋

Atomically updates v to (v & i) with full ordering.

no cap — the whole operation is one atomic little moment. nobody sees the in-between. it's giving ✨seamless✨. and the full ordering part? that means she's not being casual about memory ordering, she's being serious about it. full ordering, periodt 🔥

Safe to use in noinstr code; prefer atomic64_fetch_and elsewhere.

so like — noinstr code is the super-strict zone, and she's allowed in there, which is iconic of her. but if you're not in noinstr code? use atomic64_fetch_and instead. she's telling you herself. listen to her 🙈

👑 RETURN 👑

The original value of v.

not the new one, bestie — the original. the before picture 📸. she hands you what v was prior to the AND, so you can go be nosy about it. iykyk 💜

🌈 SEE ALSO 🌈

okay this list is long long. like, genuinely. but every single one of these is here for a reason so we're doing all of them. no skipping. hydration and completeness 💧

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

🍓 the 32-bit girlies — read & set

🍓 add family

🍓 sub family

🍓 inc family

🍓 dec family

🍓 and / andnot

🍓 or / xor

🍓 exchange & compare-exchange

🍓 the test-y ones

🧚 and now the 64-bit girlies (that's our household)

💜 read & set

💜 add family

💜 sub family

💜 inc family

💜 dec family

💜 and / andnot

💜 or / xor

💜 exchange & compare-exchange

💜 the test-y ones

bestie if you read that whole list you deserve a little treat 🍓 go drink some water, and remember: noinstr is the only place she needs to be the raw one 💖

okay that's the page!! she lives in ./include/linux/atomic, she's dated October 2026, and she's signing off as raw_atomic64_fetch_and(9) — mwah, go AND something atomically, you got this 👑💅✨

📦 where this page comes from