raw_atomic64_sub_return(9)

💖 raw_atomic64_sub_return(9) — atomic subtract with full ordering ✨

okay so bestie, welcome to the Kernel API Manual page for raw_atomic64_sub_return(9). It’s giving “atomic math, but make it fully ordered,” and honestly? iconic. 💅

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🎀 NAME 🎀

raw_atomic64_sub_return — atomic subtract with full ordering 💖

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✨ SYNOPSIS ✨

s64 raw_atomic64_sub_return (s64 i , atomic64_t *v );

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🫶 ARGUMENTS 🫶

• i — the s64 value to subtract, bestie. That’s the amount getting taken off. 💅
• v — pointer to atomic64_t. Yep, that’s the atomic value in question. 🫶

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🦋 DESCRIPTION 🦋

So like, this atomically updates v to (v - i) with full ordering. ✨ The subtract and the ordering are a package deal — no cap.

heads up, bestie: it’s safe to use in noinstr code, but elsewhere you should prefer atomic64_sub_return instead. 🫶

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👑 RETURN 👑

The updated value of v. That’s it. That’s the tea. 💅

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🌈 SEE ALSO 🌈

kernel file: ./include/linux/atomic/atomic-arch-fallback.h

and the whole extended atomic family, periodt:

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_acquire(9),
raw_atomic64_sub_return_release(9), raw_atomic64_sub_return_relaxed(9),
raw_atomic64_fetch_sub(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 💖 — source/version ./include/linux/atomic, dated October 2026, page raw_atomic64_sub_return(9). That’s the footer vibe, folded into a cute little sign-off. 🎀