raw_atomic_fetch_andnot(9)

📦 version 7.3.1, in nixpkgs unstable

💅 raw_atomic_fetch_andnot(9) 💅

okay so this is a page from the Kernel API Manual bestie, and it's about one (1) very specific little atomic helper. she's niche, she's powerful, she's raw_atomic_fetch_andnot. let's get into it 🎀

✨ NAME ✨

raw_atomic_fetch_andnot — atomic bitwise AND NOT, but make it full ordering 💅

🌸 SYNOPSIS 🌸

int raw_atomic_fetch_andnot (int i , atomic_t *v );

🦋 ARGUMENTS 🦋

  • i — an int value. that's it, that's the girl. just an int. 💖
  • v — pointer to atomic_t. this is the one getting updated, bestie, so be nice to her.

🔥 DESCRIPTION 🔥

okay so the whole vibe: this atomically updates v to (v & ~i) with full ordering. like, she does the bitwise AND NOT and keeps everybody's memory ordering in check at the same time. multitasking icon. 👑

she's safe to use in noinstr code — that's her whole special talent. but everywhere else? prefer atomic_fetch_andnot. no cap, that's literally what the page says. 🫶

⭐ RETURN ⭐

the original value of v — like, before she did her little bitwise thing to it. she hands you the before pic and keeps the after. 💀

🌈 SEE ALSO 🌈

the kernel file lives right here: ./include/linux/atomic/atomic-arch-fallback.h 📁

and now... the friend group. the whole entire friend group. buckle up bestie, this is a long list and every single one of them is invited to the party 🎉:

that's the whole squad, iykyk 🧚

and that's the page!! mwah 💋 she lives in ./include/linux/atomic and she's dated October 2026 — so she's from the future, main character energy fr fr 🌟 go forth and AND NOT responsibly bestie 🫶✨

📦 where this page comes from