atomic64_fetch_and_relaxed(9)

📦 version 7.3.1, in nixpkgs unstable

💅 atomic64_fetch_and_relaxed 💅

okay so bestie, welcome to the Kernel API Manual, section 9 — this is the page for atomic64_fetch_and_relaxed and it's honestly kind of iconic. it's a tiny little atomic op that does a bitwise AND but also hands you back the old value like a lil souvenir. let's get into it 🫶

🌸 NAME 🌸

atomic64_fetch_and_relaxed — atomic bitwise AND with relaxed ordering

like yes, she's ANDing, and yes, she's relaxed about the ordering. main character energy fr.

🦋 SYNOPSIS 🦋

s64 atomic64_fetch_and_relaxed (s64 i , atomic64_t *v );

🎀 ARGUMENTS 🎀

  • i — an s64 value. that's the thing you're ANDing in 💖
  • v — pointer to atomic64_t. this is the atomic thing that's gonna get updated, she's the target of the whole operation ✨

💜 DESCRIPTION 💜

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

that's it, that's the whole vibe — one atomic AND, chill ordering, done. slay.

⚠️ okay real talk though bestie, this one is unsafe to use in noinstr code — if you're in there, use raw_atomic64_fetch_and_relaxed instead. no cap, don't ignore this one 😭

🔥 RETURN 🔥

The original value of v. like, the value before the AND happened — she gives you the receipts 💅

👑 SEE ALSO 👑

Kernel file ./include/linux/atomic/atomic-instrumented.h — and honestly the whole atomic family is here, so buckle up bestie, we're listing every single one 🌈

🍓 the plain atomic_* crew

🧚 the atomic64_* crew

🌈 the atomic_long_* crew

and that's the whole page bestie, ily, go AND some 64-bit values atomically 💖✨

this cutie lives in ./include/linux/atomic, dated October 2026, and it's filed under atomic64_fetch_and_relaxed(9) — mwah, periodt 🎀

📦 where this page comes from