raw_atomic64_fetch_sub(9)

🌸 NAME · raw_atomic64_fetch_sub(9) 🌸

okay so bestie, this is the page for raw_atomic64_fetch_sub(9) from the Kernel API Manual — and it is literally the raw atomic64 subtract with full ordering 💅. It does the atomic math, keeps the ordering, and hands you back the old value. slay. 💖

✨ SYNOPSIS ✨

s64 raw_atomic64_fetch_sub (s64 i , atomic64_t *v );

🎀 ARGUMENTS 🎀

• i — the s64 value to subtract 🍓
• v — pointer to an atomic64_t 🫶

🦋 DESCRIPTION 🦋

Atomically updates v to (v - i) with full ordering ✨ no cap, full ordering is the whole point.

It’s safe to use in noinstr code. But if you’re not in that specific vibe, prefer atomic64_fetch_sub elsewhere, bestie 💖.

🌈 RETURN 🌈

The original value of v 👑. That’s the “fetch” part doing its main character thing.

🌟 SEE ALSO 🌟

Kernel file: ./include/linux/atomic/atomic-arch-fallback.h 📁

the whole atomic friend group is here — exact refs, no cap:

raw_atomic_read(9), raw_atomic_read_acquire(9), raw_atomic_set(9),
raw_atomic_set_release(9), raw_atomic_add(9), raw_atomic_add_return(9),
raw_atomic_add_return_acquire(9), raw_atomic_add_return_release(9),
raw_atomic_add_return_relaxed(9), raw_atomic_fetch_add(9),
raw_atomic_fetch_add_acquire(9), raw_atomic_fetch_add_release(9),
raw_atomic_fetch_add_relaxed(9), raw_atomic_sub(9),
raw_atomic_sub_return(9), raw_atomic_sub_return_acquire(9),
raw_atomic_sub_return_release(9), raw_atomic_sub_return_relaxed(9),
raw_atomic_fetch_sub(9), raw_atomic_fetch_sub_acquire(9),
raw_atomic_fetch_sub_release(9), raw_atomic_fetch_sub_relaxed(9),
raw_atomic_inc(9), raw_atomic_inc_return(9),
raw_atomic_inc_return_acquire(9), raw_atomic_inc_return_release(9),
raw_atomic_inc_return_relaxed(9), raw_atomic_fetch_inc(9),
raw_atomic_fetch_inc_acquire(9), raw_atomic_fetch_inc_release(9),
raw_atomic_fetch_inc_relaxed(9), raw_atomic_dec(9),
raw_atomic_dec_return(9), raw_atomic_dec_return_acquire(9),
raw_atomic_dec_return_release(9), raw_atomic_dec_return_relaxed(9),
raw_atomic_fetch_dec(9), raw_atomic_fetch_dec_acquire(9),
raw_atomic_fetch_dec_release(9), raw_atomic_fetch_dec_relaxed(9),
raw_atomic_and(9), raw_atomic_fetch_and(9),
raw_atomic_fetch_and_acquire(9), raw_atomic_fetch_and_release(9),
raw_atomic_fetch_and_relaxed(9), raw_atomic_andnot(9),
raw_atomic_fetch_andnot(9), raw_atomic_fetch_andnot_acquire(9),
raw_atomic_fetch_andnot_release(9), raw_atomic_fetch_andnot_relaxed(9),
raw_atomic_or(9), raw_atomic_fetch_or(9),
raw_atomic_fetch_or_acquire(9), raw_atomic_fetch_or_release(9),
raw_atomic_fetch_or_relaxed(9), raw_atomic_xor(9),
raw_atomic_fetch_xor(9), raw_atomic_fetch_xor_acquire(9),
raw_atomic_fetch_xor_release(9), raw_atomic_fetch_xor_relaxed(9),
raw_atomic_xchg(9), raw_atomic_xchg_acquire(9),
raw_atomic_xchg_release(9), raw_atomic_xchg_relaxed(9),
raw_atomic_cmpxchg(9), raw_atomic_cmpxchg_acquire(9),
raw_atomic_cmpxchg_release(9), raw_atomic_cmpxchg_relaxed(9),
raw_atomic_try_cmpxchg(9), raw_atomic_try_cmpxchg_acquire(9),
raw_atomic_try_cmpxchg_release(9), raw_atomic_try_cmpxchg_relaxed(9),
raw_atomic_sub_and_test(9), raw_atomic_dec_and_test(9),
raw_atomic_inc_and_test(9), raw_atomic_add_negative(9),
raw_atomic_add_negative_acquire(9), raw_atomic_add_negative_release(9),
raw_atomic_add_negative_relaxed(9), raw_atomic_fetch_add_unless(9),
raw_atomic_add_unless(9), raw_atomic_inc_not_zero(9),
raw_atomic_inc_unless_negative(9), raw_atomic_dec_unless_positive(9),
raw_atomic_dec_if_positive(9), raw_atomic64_read(9),
raw_atomic64_read_acquire(9), raw_atomic64_set(9),
raw_atomic64_set_release(9), raw_atomic64_add(9),
raw_atomic64_add_return(9), raw_atomic64_add_return_acquire(9),
raw_atomic64_add_return_release(9), raw_atomic64_add_return_relaxed(9),
raw_atomic64_fetch_add(9), raw_atomic64_fetch_add_acquire(9),
raw_atomic64_fetch_add_release(9), raw_atomic64_fetch_add_relaxed(9),
raw_atomic64_sub(9), raw_atomic64_sub_return(9),
raw_atomic64_sub_return_acquire(9), raw_atomic64_sub_return_release(9),
raw_atomic64_sub_return_relaxed(9), raw_atomic64_fetch_sub_acquire(9),
raw_atomic64_fetch_sub_release(9), raw_atomic64_fetch_sub_relaxed(9),
raw_atomic64_inc(9), raw_atomic64_inc_return(9),
raw_atomic64_inc_return_acquire(9), raw_atomic64_inc_return_release(9),
raw_atomic64_inc_return_relaxed(9), raw_atomic64_fetch_inc(9),
raw_atomic64_fetch_inc_acquire(9), raw_atomic64_fetch_inc_release(9),
raw_atomic64_fetch_inc_relaxed(9), raw_atomic64_dec(9),
raw_atomic64_dec_return(9), raw_atomic64_dec_return_acquire(9),
raw_atomic64_dec_return_release(9), raw_atomic64_dec_return_relaxed(9),
raw_atomic64_fetch_dec(9), raw_atomic64_fetch_dec_acquire(9),
raw_atomic64_fetch_dec_release(9), raw_atomic64_fetch_dec_relaxed(9),
raw_atomic64_and(9), raw_atomic64_fetch_and(9),
raw_atomic64_fetch_and_acquire(9), raw_atomic64_fetch_and_release(9),
raw_atomic64_fetch_and_relaxed(9), raw_atomic64_andnot(9),
raw_atomic64_fetch_andnot(9), raw_atomic64_fetch_andnot_acquire(9),
raw_atomic64_fetch_andnot_release(9),
raw_atomic64_fetch_andnot_relaxed(9), raw_atomic64_or(9),
raw_atomic64_fetch_or(9), raw_atomic64_fetch_or_acquire(9),
raw_atomic64_fetch_or_release(9), raw_atomic64_fetch_or_relaxed(9),
raw_atomic64_xor(9), raw_atomic64_fetch_xor(9),
raw_atomic64_fetch_xor_acquire(9), raw_atomic64_fetch_xor_release(9),
raw_atomic64_fetch_xor_relaxed(9), raw_atomic64_xchg(9),
raw_atomic64_xchg_acquire(9), raw_atomic64_xchg_release(9),
raw_atomic64_xchg_relaxed(9), raw_atomic64_cmpxchg(9),
raw_atomic64_cmpxchg_acquire(9), raw_atomic64_cmpxchg_release(9),
raw_atomic64_cmpxchg_relaxed(9), raw_atomic64_try_cmpxchg(9),
raw_atomic64_try_cmpxchg_acquire(9),
raw_atomic64_try_cmpxchg_release(9),
raw_atomic64_try_cmpxchg_relaxed(9), raw_atomic64_sub_and_test(9),
raw_atomic64_dec_and_test(9), raw_atomic64_inc_and_test(9),
raw_atomic64_add_negative(9), raw_atomic64_add_negative_acquire(9),
raw_atomic64_add_negative_release(9),
raw_atomic64_add_negative_relaxed(9), raw_atomic64_fetch_add_unless(9),
raw_atomic64_add_unless(9), raw_atomic64_inc_not_zero(9),
raw_atomic64_inc_unless_negative(9),
raw_atomic64_dec_unless_positive(9), raw_atomic64_dec_if_positive(9)

xoxo bestie 🫶 — source/version: ./include/linux/atomic · date: October 2026 · page: raw_atomic64_fetch_sub(9) 💖