raw_atomic64..._inc_acquire(9)

📦 version 7.3.1, in nixpkgs unstable

🎀 raw_atomic64..._inc_acquire(9) 🎀

okay so bestie, you're in the Kernel API Manual and this page is specifically about raw_atomic64_fetch_inc_acquire — yes the title up top is abbreviated with the little ... and honestly that's just how it is, don't come for me 💅

it's a tiny page, it's an icon, let's go 🦋

✨ NAME ✨

raw_atomic64_fetch_inc_acquire — atomic increment, but make it acquire ordering 🌸

🧚 SYNOPSIS 🧚

s64 raw_atomic64_fetch_inc_acquire (atomic64_t *v );

that's the whole signature, she's compact, she's precise, she's giving minimalism 🫶

💖 ARGUMENTS 💖

  • v — pointer to atomic64_t. yeah. that's the vibe. a pointer, to an atomic64_t, that's the whole thing 🎀

🔥 DESCRIPTION 🔥

okay so here's the tea: this function atomically updates v to (v + 1) with acquire ordering. atomic, meaning nobody gets to catch her mid-increment, no cap 💀

and then the part you actually need to remember: it is safe to use in noinstr code — prefer atomic64_fetch_inc_acquire elsewhere. like, elsewhere is elsewhere's problem, noinstr is this function's whole moment 👑

lowkey important: the "prefer atomic64_fetch_inc_acquire elsewhere" part is not a suggestion, it's the documented guidance. raw_ is the specialist, not the default ✨

⭐ RETURN ⭐

the original value of v — as in the value from before the increment. she gives you the past, then she moves on. main character behaviour fr fr 💅

🌈 SEE ALSO 🌈

kernel file: ./include/linux/atomic/atomic-arch-fallback.h — that's where she lives, that's her address 🏠

and now, the friend group. literally everyone. buckle up bestie, this list is long and every single one of them is invited to the group chat 👑:

like I said. everyone. ate and left no crumbs 🌸💀

and that's the page, bestie 🫶 this little love letter lives in the source dir <code>./include/linux/atomic</code> and the date on it is October 2026 — go forth, increment atomically, and remember: raw_ is for noinstr, atomic64_fetch_inc_acquire is for everywhere else 💜✨

📦 where this page comes from