raw_atomic_long_fetch_xor(9)

📦 version 7.3.1, in nixpkgs unstable

🦋 raw_atomic_long_fetch_xor(9) — Kernel API Manual 🦋

🌸 NAME 🌸

raw_atomic_long_fetch_xor is literally the atomic bitwise XOR with full ordering bestie. No cap, this is the one. 💅

✨ SYNOPSIS ✨

long raw_atomic_long_fetch_xor (long i , atomic_long_t *v );

🎀 ARGUMENTS 🎀

  • i — a long value. That's the first argument, bestie.
  • v — pointer to atomic_long_t. That's the atomic long you're working with.

💖 DESCRIPTION 💖

Okay so the actual tea: this function atomically updates v to (v ^ i) with full ordering. That's the whole vibe. ✨

It's safe to use in noinstr code, which is giving special-purpose main character energy. Everywhere else, the page says prefer atomic_long_fetch_xor — so keep this raw one for the noinstr moments and let atomic_long_fetch_xor handle the rest. 🫶

👑 RETURN 👑

The original value of v — the pre-XOR one. You get the original, not the updated value. 💅

🌈 SEE ALSO 🌈

Kernel file first, because the source is the moment:

  • ./include/linux/atomic/atomic-long.h

And the whole raw_atomic_long_* family — every single one is here, no skips, no crumbs:

📖 read + set

➕ add squad

➖ sub squad

🔁 inc + dec squad

🧚 bitwise besties

🔄 xchg + cmpxchg crew

🍓 tests + specials

That's the whole page, bestie! 🫶 Source/version is ./include/linux/atomic, date is October 2026, and the manual page is raw_atomic_long_fetch_xor(9) from the Kernel API Manual. Stay slaying those atomics. 💅✨

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