atomic64_xchg_acquire(9)

📦 version 7.3.1, in nixpkgs unstable

💅 atomic64_xchg_acquire — atomic exchange with acquire ordering ✨

okay bestie, welcome to the Kernel API Manual 🎀 this one's a little function with big main-character energy, and it's literally in the kernel, so let's get into it 💖

🌸 NAME 🌸

atomic64_xchg_acquire — atomic exchange with acquire ordering 🦋

✨ SYNOPSIS ✨

s64 atomic64_xchg_acquire (atomic64_t *v , s64 new );

like, that's it. that's the whole vibe check 💅

🎀 ARGUMENTS 🎀

  • v — pointer to atomic64_t 🫶 (yes bestie, a pointer, don't hand it the struct itself, i'm begging)
  • new — the s64 value to assign ⭐

🧚 DESCRIPTION 🧚

So here's the tea ☕ — it atomically updates v to new with acquire ordering. Like, atomically atomically. No one can catch it halfway through, no cap 🔥

⚠️ okay this part matters — it's unsafe to use in noinstr code. if you're in there, use raw_atomic64_xchg_acquire instead. like, do not come for this function in noinstr land, it will not go well for you 😭

👑 RETURN 👑

the original value of v 💀✨ — yes, you get the old one back, that's the whole point of an exchange, bestie, it's giving swap.

🌈 SEE ALSO 🌈

the source file for all of this is the kernel file ./include/linux/atomic/atomic-instrumented.h — go say hi 🫶

and now, the extended family. it's a big family. like thanksgiving-dinner big 🍓

the atomic girlies:

the atomic64 crew (our girl's home team 💖):

the atomic_long cousins 🌟:

okay that's the whole squad, ily, go read them all 🧚💜

✨ cute little sign-off ✨ — this icon of a page comes courtesy of the source ./include/linux/atomic, dated October 2026, and it's your girl atomic64_xchg_acquire(9) signing off. periodt 💅🎀🦋

📦 where this page comes from