raw_atomic64..._sub_release(9)

📦 version 7.3.1, in nixpkgs unstable

💅 raw_atomic64..._sub_release(9) 💅

okay so you're in the Kernel API Manual, bestie, and this page is literally titled raw_atomic64..._sub_release(9) — no cap, that's the whole header. Buckle up 🎀

✨ NAME ✨

raw_atomic64_fetch_sub_release — atomic subtract, but make it release ordering 💫

🌸 SYNOPSIS 🌸

s64 raw_atomic64_fetch_sub_release (s64 i , atomic64_t *v );

🦋 ARGUMENTS 🦋

  • i — an s64, and it's the value you're subtracting. the amount getting yeeted 💀
  • v — pointer to atomic64_t. the main character we're updating 🫶

💖 DESCRIPTION 💖

okay so picture this: it atomically updates v to (v - i) with release ordering. that's the vibe. the way it does the whole thing in one atomic little move is iconic, fr.

it's safe to use in noinstr code — but lowkey, everywhere else? prefer atomic64_fetch_sub_release instead. like it's not wrong, it's just not the one you should be texting first 👀

🔥 RETURN 🔥

the original value of v — like, the value before your subtraction happened. it gives you receipts, periodt 💅

👑 SEE ALSO 👑

first up, the source file on the kernel side:

  • ./include/linux/atomic/atomic-arch-fallback.h

and now… the entire friend group 🌈 the 32-bit raw_atomic_* girlies:

and the 64-bit raw_atomic64_* crew 🧚 (yes, including this page itself, self-love only):

real talk: this whole page lives in ./include/linux/atomic and it's stamped October 2026. go be atomic, bestie 🍓✨

anyway that's the page, ily, go read the whole kernel now 💜🫶🎀

📦 where this page comes from