raw_atomic_long_cmpxchg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 raw_atomic_long_cmpxchg 💅

okay so bestie, welcome to the Kernel API Manual ✨ this one's a little kernel function called raw_atomic_long_cmpxchg, and honestly? it ate. let's get into it 🫶

🌸 NAME 🌸

raw_atomic_long_cmpxchg — atomic compare and exchange with full ordering 🔥

🎀 SYNOPSIS 🎀

long raw_atomic_long_cmpxchg (atomic_long_t *v , long old , long new );

🦋 ARGUMENTS 🦋

  • v — pointer to atomic_long_t 👈 like, the thing we're messing with
  • old — the long value to compare with 👀 the one we're checking against
  • new — the long value to assign 💖 the glow-up value, if the vibe check passes

✨ DESCRIPTION ✨

okay so here's the tea ☕ if (v == old), it atomically updates v to new with full ordering. slay. otherwise, v is literally not modified at all, and you get relaxed ordering instead. no cap 🤷‍♀️

it's safe to use in noinstr code — but bestie, prefer atomic_long_cmpxchg elsewhere, fr fr 💅 that's the main character, this one's the special-case icon 👑

⭐ RETURN ⭐

the original value of v 💖 that's it, that's the return. iykyk

🧚 SEE ALSO 🧚

kernel file ./include/linux/atomic/atomic-long.h 📁

and now the obligatory friend group, no one gets left out 🫶:

and that's the whole page bestie, every single one of them accounted for 🫶 no skips, no summaries, periodt 💀✨

🌸 ok final sign-off 🌸 this little beauty lives in ./include/linux/atomic, it's dated October 2026, and it's page raw_atomic_long_cmpxchg(9) of your fave manual. mwah 💋 go be atomic, icon 👑🌈

📦 where this page comes from