raw_atomic_cmpxchg_relaxed(9)

📦 version 7.3.1, in nixpkgs unstable

💅 raw_atomic_cmpxchg_relaxed(9) 💅

Kernel API Manual, section 9 — the group chat edition ✨

okay bestie, sit down, because today's main character is a little atomic op that does comparison-and-swap energy but with the chillest ordering vibes 💖

🌸 NAME 🌸

raw_atomic_cmpxchg_relaxed — atomic compare and exchange with relaxed ordering ✨

🦋 SYNOPSIS 🦋

int raw_atomic_cmpxchg_relaxed (atomic_t *v , int old , int new );

🎀 ARGUMENTS 🎀

  • v — a pointer to atomic_t, the thing we're side-eyeing 👀
  • old — the int value to compare against, like the vibe check you're running
  • new — the int value to assign if the vibe check passes 💅

✨ DESCRIPTION ✨

So here's the tea ☕ — if (v == old), it atomically updates v to new with relaxed ordering. Otherwise? v is not modified, and relaxed ordering is provided anyway. respectful king behavior, honestly 🫶

It's safe to use in noinstr code — that's its whole thing, no cap. But anywhere else, prefer atomic_cmpxchg_relaxed instead, okurrr? 😌

fr fr, noinstr is the niche here — if you're not in it, go hang with atomic_cmpxchg_relaxed like everyone else 💀

💖 RETURN 💖

The original value of v — like, what it was before the swap. she remembers everything 👑

🌈 SEE ALSO 🌈

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

and now, the moment you've all been waiting for — the entire atomic family reunion 🎉 (yes, all of them, nobody's getting left out of this list):

that's the whole squad, not one of them left on read 💜

and that's the page, bestie 🎀 this little icon lives in the kernel source file ./include/linux/atomic and it's stamped October 2026 — same energy as raw_atomic_cmpxchg_relaxed(9) forever and always ✨💖 slay, bye! 💅🦋

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