atomic64_fetch_and(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME 💅

okay so bestie, you're looking at atomic64_fetch_and(9) — the Kernel API Manual page for an atomic bitwise AND with full ordering. one function, zero drama, maximum atomicity ✨

✨ SYNOPSIS ✨

s64 atomic64_fetch_and (s64 i , atomic64_t *v );

🫶 ARGUMENTS 🫶

  • i — an s64 value. that's the number, bestie, the one doing the ANDing.
  • v — pointer to atomic64_t. the actual spot in memory getting updated, front and center, main character energy 👑

🦋 DESCRIPTION 🦋

so what does it do? it atomically updates v to (v & i) — with full ordering, no cap. the whole operation lands as one indivisible little moment, and everyone else watching that value sees it happen in the correct order 💖

🚩 real talk though: it's unsafe to use in noinstr code — use raw_atomic64_fetch_and there instead. don't be the person who ignores this, i'm begging 😭

🌸 RETURN 🌸

it hands you back the original value of v — the pre-glow-up version, before the AND hit it 🎀

🌈 SEE ALSO 🌈

the source of all this is the kernel file ./include/linux/atomic/atomic-instrumented.h, and honestly? the family tree is huge. every single one of these is invited to the group chat 💅

the atomic_* girlies

the atomic64_* besties (yes, our girl's whole family 💖)

the atomic_long_* cousins 🧚

that's the whole page, bestie, and it lives in ./include/linux/atomic, dated October 2026 — mwah, go AND some bits safely 💋🦋

📦 where this page comes from