atomic64_fetch_sub_relaxed(9)

📦 version 7.3.1, in nixpkgs unstable

💅 atomic64_fetch_sub_relaxed(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for atomic64_fetch_sub_relaxed(9), and honestly? she's a little workhorse and we stan her 🫶

🌸 NAME 🌸

atomic64_fetch_sub_relaxed — atomic subtract with relaxed ordering 💖 (yes, "relaxed" is literally in the name, she is chill like that)

✨ SYNOPSIS ✨

s64 atomic64_fetch_sub_relaxed (s64 i , atomic64_t *v );

🎀 ARGUMENTS 🎀

  • i — the s64 value you're subtracting. that's the number going bye-bye 🔥
  • v — pointer to atomic64_t. that's the thing getting updated, main character energy 👑

🦋 DESCRIPTION 🦋

So what does she do? She atomically updates v to (v - i) with relaxed ordering. atomically, meaning nobody can catch her mid-subtract, no cap 🧚

⚠️ unsafe to use in noinstr code — like, actually don't. use raw_atomic64_fetch_sub_relaxed there instead. she said what she said 💀

💜 RETURN 💜

The original value of v — i.e. the value before the subtract happened. she hands you the receipt, then changes the total 😭✨

🌈 SEE ALSO 🌈

okay this list is genuinely long, so grab a snack 🍓 — the kernel file is ./include/linux/atomic/atomic-instrumented.h and here's the whole squad:

that's the whole page bestie, no skips, no cap 💅✨

and for the cute sign-off moment 🎀 — this one came from ./include/linux/atomic, dated October 2026, and she answers to the name atomic64_fetch_sub_relaxed(9). go forth and subtract atomically, icon 👑🦋

📦 where this page comes from