atomic64_add_return_acquire(9)

🌸 atomic64_add_return_acquire(9) 🌸

okay so bestie, you know how i feel about atomics? obsessed. this one's a kernel API manual page, and honestly it's short and sweet and we're gonna get through it together, no cap ✨

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💖 NAME 💖

atomic64_add_return_acquire — atomic add, but make it acquire ordering 💅

like, it adds stuff atomically AND it does the memory-ordering thing. two jobs, one function, main character energy.

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🎀 SYNOPSIS 🎀

s64 atomic64_add_return_acquire (s64 i , atomic64_t *v );

that's the whole signature, don't be scared 🫶

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🦋 ARGUMENTS 🦋

• i — an s64 value, aka the number you want to add. it's a signed 64-bit situation, so it can be negative too, she contains multitudes 💜
• v — a pointer to an atomic64_t. this is your target, the thing getting updated. point at her and she'll glow up ✨

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🌈 DESCRIPTION 🌈

Atomically updates v to (v + i) with acquire ordering. like literally, that's it, that's the whole vibe. the add happens all at once (nobody can peek at a half-done value, we don't do that here 🙈) and it comes with acquire ordering attached 💅

⚠️ Unsafe to use in noinstr code — bestie, if you're in noinstr territory, do NOT call this one. use raw_atomic64_add_return_acquire there instead. this is a real caveat, not a drill 💀

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🔥 RETURN 🔥

The updated value of v. not the old one, not the delta — the shiny new post-add value. so if you were expecting something else, adjust your expectations, she's giving updated 🎀

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⭐ SEE ALSO ⭐

the whole extended family, fr fr. this one lives in the kernel file ./include/linux/atomic/atomic-instrumented.h, and these are all her relatives (iykyk, it's a big family reunion 👑):

atomic_read(9), atomic_read_acquire(9), atomic_set(9), atomic_set_release(9),
atomic_add(9), atomic_add_return(9), atomic_add_return_acquire(9),
atomic_add_return_release(9), atomic_add_return_relaxed(9),
atomic_fetch_add(9), atomic_fetch_add_acquire(9),
atomic_fetch_add_release(9), atomic_fetch_add_relaxed(9), atomic_sub(9),
atomic_sub_return(9), atomic_sub_return_acquire(9),
atomic_sub_return_release(9), atomic_sub_return_relaxed(9),
atomic_fetch_sub(9), atomic_fetch_sub_acquire(9),
atomic_fetch_sub_release(9), atomic_fetch_sub_relaxed(9), atomic_inc(9),
atomic_inc_return(9), atomic_inc_return_acquire(9),
atomic_inc_return_release(9), atomic_inc_return_relaxed(9),
atomic_fetch_inc(9), atomic_fetch_inc_acquire(9),
atomic_fetch_inc_release(9), atomic_fetch_inc_relaxed(9), atomic_dec(9),
atomic_dec_return(9), atomic_dec_return_acquire(9),
atomic_dec_return_release(9), atomic_dec_return_relaxed(9),
atomic_fetch_dec(9), atomic_fetch_dec_acquire(9),
atomic_fetch_dec_release(9), atomic_fetch_dec_relaxed(9), atomic_and(9),
atomic_fetch_and(9), atomic_fetch_and_acquire(9),
atomic_fetch_and_release(9), atomic_fetch_and_relaxed(9),
atomic_andnot(9), atomic_fetch_andnot(9),
atomic_fetch_andnot_acquire(9), atomic_fetch_andnot_release(9),
atomic_fetch_andnot_relaxed(9), atomic_or(9), atomic_fetch_or(9),
atomic_fetch_or_acquire(9), atomic_fetch_or_release(9),
atomic_fetch_or_relaxed(9), atomic_xor(9), atomic_fetch_xor(9),
atomic_fetch_xor_acquire(9), atomic_fetch_xor_release(9),
atomic_fetch_xor_relaxed(9), atomic_xchg(9), atomic_xchg_acquire(9),
atomic_xchg_release(9), atomic_xchg_relaxed(9), atomic_cmpxchg(9),
atomic_cmpxchg_acquire(9), atomic_cmpxchg_release(9),
atomic_cmpxchg_relaxed(9), atomic_try_cmpxchg(9),
atomic_try_cmpxchg_acquire(9), atomic_try_cmpxchg_release(9),
atomic_try_cmpxchg_relaxed(9), atomic_sub_and_test(9),
atomic_dec_and_test(9), atomic_inc_and_test(9), atomic_add_negative(9),
atomic_add_negative_acquire(9), atomic_add_negative_release(9),
atomic_add_negative_relaxed(9), atomic_fetch_add_unless(9),
atomic_add_unless(9), atomic_inc_not_zero(9),
atomic_inc_unless_negative(9), atomic_dec_unless_positive(9),
atomic_dec_if_positive(9), atomic64_read(9), atomic64_read_acquire(9),
atomic64_set(9), atomic64_set_release(9), atomic64_add(9),
atomic64_add_return(9), atomic64_add_return_release(9),
atomic64_add_return_relaxed(9), atomic64_fetch_add(9),
atomic64_fetch_add_acquire(9), atomic64_fetch_add_release(9),
atomic64_fetch_add_relaxed(9), atomic64_sub(9), atomic64_sub_return(9),
atomic64_sub_return_acquire(9), atomic64_sub_return_release(9),
atomic64_sub_return_relaxed(9), atomic64_fetch_sub(9),
atomic64_fetch_sub_acquire(9), atomic64_fetch_sub_release(9),
atomic64_fetch_sub_relaxed(9), atomic64_inc(9), atomic64_inc_return(9),
atomic64_inc_return_acquire(9), atomic64_inc_return_release(9),
atomic64_inc_return_relaxed(9), atomic64_fetch_inc(9),
atomic64_fetch_inc_acquire(9), atomic64_fetch_inc_release(9),
atomic64_fetch_inc_relaxed(9), atomic64_dec(9), atomic64_dec_return(9),
atomic64_dec_return_acquire(9), atomic64_dec_return_release(9),
atomic64_dec_return_relaxed(9), atomic64_fetch_dec(9),
atomic64_fetch_dec_acquire(9), atomic64_fetch_dec_release(9),
atomic64_fetch_dec_relaxed(9), atomic64_and(9), atomic64_fetch_and(9),
atomic64_fetch_and_acquire(9), atomic64_fetch_and_release(9),
atomic64_fetch_and_relaxed(9), atomic64_andnot(9),
atomic64_fetch_andnot(9), atomic64_fetch_andnot_acquire(9),
atomic64_fetch_andnot_release(9), atomic64_fetch_andnot_relaxed(9),
atomic64_or(9), atomic64_fetch_or(9), atomic64_fetch_or_acquire(9),
atomic64_fetch_or_release(9), atomic64_fetch_or_relaxed(9),
atomic64_xor(9), atomic64_fetch_xor(9), atomic64_fetch_xor_acquire(9),
atomic64_fetch_xor_release(9), atomic64_fetch_xor_relaxed(9),
atomic64_xchg(9), atomic64_xchg_acquire(9), atomic64_xchg_release(9),
atomic64_xchg_relaxed(9), atomic64_cmpxchg(9),
atomic64_cmpxchg_acquire(9), atomic64_cmpxchg_release(9),
atomic64_cmpxchg_relaxed(9), atomic64_try_cmpxchg(9),
atomic64_try_cmpxchg_acquire(9), atomic64_try_cmpxchg_release(9),
atomic64_try_cmpxchg_relaxed(9), atomic64_sub_and_test(9),
atomic64_dec_and_test(9), atomic64_inc_and_test(9),
atomic64_add_negative(9), atomic64_add_negative_acquire(9),
atomic64_add_negative_release(9), atomic64_add_negative_relaxed(9),
atomic64_fetch_add_unless(9), atomic64_add_unless(9),
atomic64_inc_not_zero(9), atomic64_inc_unless_negative(9),
atomic64_dec_unless_positive(9), atomic64_dec_if_positive(9),
atomic_long_read(9), atomic_long_read_acquire(9), atomic_long_set(9),
atomic_long_set_release(9), atomic_long_add(9),
atomic_long_add_return(9), atomic_long_add_return_acquire(9),
atomic_long_add_return_release(9), atomic_long_add_return_relaxed(9),
atomic_long_fetch_add(9), atomic_long_fetch_add_acquire(9),
atomic_long_fetch_add_release(9), atomic_long_fetch_add_relaxed(9),
atomic_long_sub(9), atomic_long_sub_return(9),
atomic_long_sub_return_acquire(9), atomic_long_sub_return_release(9),
atomic_long_sub_return_relaxed(9), atomic_long_fetch_sub(9),
atomic_long_fetch_sub_acquire(9), atomic_long_fetch_sub_release(9),
atomic_long_fetch_sub_relaxed(9), atomic_long_inc(9),
atomic_long_inc_return(9), atomic_long_inc_return_acquire(9),
atomic_long_inc_return_release(9), atomic_long_inc_return_relaxed(9),
atomic_long_fetch_inc(9), atomic_long_fetch_inc_acquire(9),
atomic_long_fetch_inc_release(9), atomic_long_fetch_inc_relaxed(9),
atomic_long_dec(9), atomic_long_dec_return(9),
atomic_long_dec_return_acquire(9), atomic_long_dec_return_release(9),
atomic_long_dec_return_relaxed(9), atomic_long_fetch_dec(9),
atomic_long_fetch_dec_acquire(9), atomic_long_fetch_dec_release(9),
atomic_long_fetch_dec_relaxed(9), atomic_long_and(9),
atomic_long_fetch_and(9), atomic_long_fetch_and_acquire(9),
atomic_long_fetch_and_release(9), atomic_long_fetch_and_relaxed(9),
atomic_long_andnot(9), atomic_long_fetch_andnot(9),
atomic_long_fetch_andnot_acquire(9),
atomic_long_fetch_andnot_release(9),
atomic_long_fetch_andnot_relaxed(9), atomic_long_or(9),
atomic_long_fetch_or(9), atomic_long_fetch_or_acquire(9),
atomic_long_fetch_or_release(9), atomic_long_fetch_or_relaxed(9),
atomic_long_xor(9), atomic_long_fetch_xor(9),
atomic_long_fetch_xor_acquire(9), atomic_long_fetch_xor_release(9),
atomic_long_fetch_xor_relaxed(9), atomic_long_xchg(9),
atomic_long_xchg_acquire(9), atomic_long_xchg_release(9),
atomic_long_xchg_relaxed(9), atomic_long_cmpxchg(9),
atomic_long_cmpxchg_acquire(9), atomic_long_cmpxchg_release(9),
atomic_long_cmpxchg_relaxed(9), atomic_long_try_cmpxchg(9),
atomic_long_try_cmpxchg_acquire(9), atomic_long_try_cmpxchg_release(9),
atomic_long_try_cmpxchg_relaxed(9), atomic_long_sub_and_test(9),
atomic_long_dec_and_test(9), atomic_long_inc_and_test(9),
atomic_long_add_negative(9), atomic_long_add_negative_acquire(9),
atomic_long_add_negative_release(9),
atomic_long_add_negative_relaxed(9), atomic_long_fetch_add_unless(9),
atomic_long_add_unless(9), atomic_long_inc_not_zero(9),
atomic_long_inc_unless_negative(9), atomic_long_dec_unless_positive(9),
atomic_long_dec_if_positive(9)

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🎀 okay that's the page!! source file is ./include/linux/atomic, dated October 2026, and yes she ate 💅 go forth and add your s64s atomically, bestie, love that for you 🌸🦋💖