atomic64_fetch_dec_relaxed(9)

📦 version 7.3.1, in nixpkgs unstable

💅 atomic64_fetch_dec_relaxed 💅

okay bestie so this page is straight out of the Kernel API Manual and it's the whole entire manual page for atomic64_fetch_dec_relaxed(9) — no filler, no skips, we're reading the whole thing together 🫶

🌸 NAME 🌸

atomic64_fetch_dec_relaxed — atomic decrement with relaxed ordering ✨

🦋 SYNOPSIS 🦋

s64 atomic64_fetch_dec_relaxed (atomic64_t *v );

🎀 ARGUMENTS 🎀

  • v — pointer to atomic64_t 💫 (yes that's it, that's the whole list, we love a low-effort argument list)

✨ DESCRIPTION ✨

Atomically updates v to (v - 1) with relaxed ordering. So like, the decrement itself is fully atomic (no lost updates, no half-decrements, nobody's out here sniping your value mid-operation 💅) — it's the ordering that's relaxed, and that's the whole vibe of this function.

⚠️ Unsafe to use in noinstr code; use raw_atomic64_fetch_dec_relaxed there instead. This is a hard no-cap warning, not a suggestion — literally do not do it 🙈

💖 RETURN 💖

The original value of v. Not the new one, not the decremented one — the original, the before picture, the value v had before the decrement. Iconic behavior honestly 🔥

👑 SEE ALSO 👑

Kernel file ./include/linux/atomic/atomic-instrumented.h and the entire atomic extended family, in the exact order the manual serves them up — yes we're listing every single one, grab a snack 🍓

mwah 💋 that's the whole page, every last ref, no cuts. this one lives in ./include/linux/atomic, dated October 2026, and it signs off as atomic64_fetch_dec_relaxed(9) — periodt 👑✨

📦 where this page comes from