raw_atomic64...xchg_relaxed(9)

📦 version 7.3.1, in nixpkgs unstable

💅 raw_atomic64...xchg_relaxed(9) — like, the Kernel API Manual bestie 🎀

okay so first things first, the page header says raw_atomic64...xchg_relaxed(9) and the manual it lives in is the Kernel API Manual — that's the vibe, that's the house we're in ✨

🌸 NAME 🌸

raw_atomic64_cmpxchg_relaxed — atomic compare and exchange with relaxed ordering 💫

🦋 SYNOPSIS 🦋

s64 raw_atomic64_cmpxchg_relaxed (atomic64_t *v , s64 old , s64 new );

🎀 ARGUMENTS 🎀

  • v — pointer to atomic64_t 💖 like, the thing we're poking at
  • old — s64 value to compare with 👀 the "are you who I think you are" check
  • new — s64 value to assign 🫶 the glow-up we're giving it

✨ DESCRIPTION ✨

So here's the tea, bestie: if (v == old), it atomically updates v to new with relaxed ordering 🔥 Otherwise, v is not modified and relaxed ordering is provided. either way you get the relaxed ordering, no cap 💅

Safe to use in noinstr code — but prefer atomic64_cmpxchg_relaxed elsewhere, okay? ikyk 👑 That's literally the whole assignment.

💜 RETURN 💜

The original value of v 🌈 — like, what it was before you touched it, bestie 🍓

🌟 SEE ALSO 🌟

Kernel file 💾 ./include/linux/atomic/atomic-arch-fallback.h — go read it, it's giving source-of-truth

the 32-bit raw_atomic_* fam, in order:

and the 64-bit raw_atomic64_* besties, in order too:

and that's the page, bestie 🧚 no crumbs left, every single name kept 💯

k bye, this came from the ./include/linux/atomic corner of the kernel and the date stamp on it is October 2026 — so yeah, future-coded and iconic 👑💖

📦 where this page comes from