raw_atomic_long_fetch_sub(9)

📦 version 7.3.1, in nixpkgs unstable

💅 raw_atomic_long_fetch_sub(9) — Kernel API Manual, but make it cute 💅

✨ NAME ✨

Okay so this page is raw_atomic_long_fetch_sub — the atomic subtract with full ordering bestie. That's the whole name, no cap. It's giving "subtract a long, atomically, with the full ordering vibe." 💖

🌸 SYNOPSIS 🌸

long raw_atomic_long_fetch_sub (long i , atomic_long_t *v );

Yes, that's the signature exactly — don't come for me about the spaces, it's literal. 🫶

🎀 ARGUMENTS 🎀

  • i — a long value to subtract. This is the amount being taken away, okay? 💅
  • v — pointer to atomic_long_t. This is the atomic long getting updated, and she's the main character. 👑

💫 DESCRIPTION 💫

It atomically updates v to (v - i) with full ordering. Like, the update happens atomically and the ordering is full — both details are doing important work here. ✨

Heads up: it's safe to use in noinstr code; elsewhere, prefer atomic_long_fetch_sub. That's the documented preference, bestie — no extra lore, just follow the page. 🫡

🦋 RETURN 🦋

It returns the original value of v. So you get the original value, not the new one. Keep that receipt. 🧾💖

🔥 SEE ALSO 🔥

Kernel file: ./include/linux/atomic/atomic-long.h — yes, that exact path, no edits. 🎀

The whole atomic-long squad, in the same order as the page, no omissions:

source/version: ./include/linux/atomic · date: October 2026 · manual: raw_atomic_long_fetch_sub(9) — mwah 💋✨

📦 where this page comes from