raw_atomic64..._dec_acquire(9)

📦 version 7.3.1, in nixpkgs unstable

💅 raw_atomic64_fetch_dec_acquire — from the Kernel API Manual ✨

okay bestie, welcome to the Kernel API Manual 🎀 and to the most specific little function ever. This one's a baddie that does exactly one thing and does it atomically. iykyk 💖

✨ NAME ✨

raw_atomic64_fetch_dec_acquire — atomic decrement with acquire ordering 🦋

🌸 SYNOPSIS 🌸

s64 raw_atomic64_fetch_dec_acquire (atomic64_t *v );

no cap, that's the whole vibe check. ✨

🎀 ARGUMENTS 🎀

  • v — pointer to atomic64_t 💫 (yes bestie, it's a pointer, it's always a pointer)

👑 DESCRIPTION 👑

So what does it actually do? It atomically updates v to (v - 1) with acquire ordering 🔥 — like, one clean swoop, no half-decrements, no chaos, main character energy only.

It's safe to use in noinstr code 💅 — that's literally its whole personality. But elsewhere? Prefer atomic64_fetch_dec_acquire. She's the upgraded version for regular contexts, fr fr.

🌈 RETURN 🌈

The original value of v 🫶 — the value from before the decrement, not after. So you get the 411 on what it used to be. iconic.

💜 SEE ALSO 💜

the whole friend group 💖 — here's every single one, no gatekeeping:

and that's the whole page bestie, ily, go decrement something atomically 💜🦋

sign-off tea ☕: this one came out of ./include/linux/atomic and it's dated October 2026 — periodt. 🎀✨
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