atomic64_fe...dnot_acquire(9)

📦 version 7.3.1, in nixpkgs unstable

💅 atomic64_fetch_andnot_acquire(9)

okay so bestie, welcome to the Kernel API Manual 💖 this is the page for atomic64_fetch_andnot_acquire, and honestly? it's giving "quietly powerful, does one thing perfectly" main character energy. no cap, it's a little guy with a very long name and a very specific job.

✨ NAME ✨

atomic64_fetch_andnot_acquire — atomic bitwise AND NOT with acquire ordering 🎀

like, it ANDs stuff. and NOTs stuff. atomically. with acquire ordering. all four at once, because it's an overachiever and we stan.

🌸 SYNOPSIS 🌸

s64 atomic64_fetch_andnot_acquire (s64 i , atomic64_t *v );

that's the whole handshake, bestie. two args, one s64 back. (and yes, the spacing is exactly like that in the header — don't come for me, i just report the vibes 💀)

🦋 ARGUMENTS 🦋

  • i — a s64 value. this is the mask. the "NOT" part of the situation. she's the what to clear girlie.
  • v — pointer to atomic64_t. this is the target. the one getting updated. the main character, arguably.

🎀 DESCRIPTION 🎀

okay so here's the tea 🫖 — it atomically updates v to (v & ~i) with acquire ordering.

lowkey that's it. that's the whole bit. ~i flips the mask, & clears those bits, and it all happens atomically so nobody can catch you mid-update. and the acquire ordering means the memory ordering comes along for the ride too — she's not just doing math, she's doing synchronization ✨

⚠️ unsafe to use in noinstr code — bestie i'm begging you, use raw_atomic64_fetch_andnot_acquire there instead. this one is instrumented, and instrumentation does NOT belong in noinstr land. that's a one-way ticket to weirdness 😭

⭐ RETURN ⭐

the original value of v. yes, original — she gives you the before picture, not the after. the way that it hands you the past while rewriting the future?? iconic. 💅

🧚 SEE ALSO 🧚

the source of all this magic lives in the kernel file ./include/linux/atomic/atomic-instrumented.h 🍓 and honestly the family tree is huge. buckle up, bestie, we're meeting the whole squad:

💜 the atomic_* crew

🔥 the atomic64_* crew (our own bloodline)

(psst — atomic64_fetch_andnot_acquire(9) isn't in that list because you're reading it right now. you're the page, bestie. 🪞)

🌈 the atomic_long_* crew

that's the whole family reunion, bestie. go clear some bits. responsibly. 🫶

🎀 signed, sealed, delivered from <pink>./include/linux/atomic</pink>, dated October 2026 — the Kernel API Manual said "that's a wrap" and honestly? she ate. 💖✨
📦 where this page comes from