raw_atomic64_dec_return(9)

💅 raw_atomic64_dec_return — Kernel API Manual ✨

okay so bestie, welcome to the Kernel API Manual 🎀 this one's a tiny little icon but she's lowkey important, so let's get into it 💖

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🌸 NAME 🌸

raw_atomic64_dec_return — atomic decrement with full ordering 🔥

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🦋 SYNOPSIS 🦋

s64 raw_atomic64_dec_return (atomic64_t *v );

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🎀 ARGUMENTS 🎀

• v — pointer to atomic64_t 💫

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⭐ DESCRIPTION ⭐

Atomically updates v to (v - 1) with full ordering. periodt. 💅

bestie listen 👀 — this one is safe to use in noinstr code; prefer atomic64_dec_return everywhere else. iykyk 🫶

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👑 RETURN 👑

The updated value of v. that's it, that's the whole reveal ✨

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🌈 SEE ALSO 🌈

first up, the source file herself lives at kernel file ./include/linux/atomic/atomic-arch-fallback.h 🗂️

and now… the extended family 😭 she has a LOT of cousins. every single one, no cap:

🫶 the raw_atomic_* girlies

• raw_atomic_read(9)
• raw_atomic_read_acquire(9)
• raw_atomic_set(9)
• raw_atomic_set_release(9)

🌸 the add / sub pipeline

• 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)

🦋 inc & dec (her direct neighbors 💜)

• 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)

🧚 bitwise besties

• 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)

🔥 exchange & compare crowd

• 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)

⭐ the test / unless club

• 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)

👑 the raw_atomic64_* icons (64-bit main character energy)

• raw_atomic64_read(9)
• raw_atomic64_read_acquire(9)
• raw_atomic64_set(9)
• raw_atomic64_set_release(9)

💖 64-bit add / sub pipeline

• 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(9)
• raw_atomic64_fetch_sub_acquire(9)
• raw_atomic64_fetch_sub_release(9)
• raw_atomic64_fetch_sub_relaxed(9)

🍓 64-bit inc & dec

• 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_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)

💜 64-bit bitwise besties

• 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)

🎀 64-bit exchange & compare crowd

• 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)

🌱 64-bit test / unless club

• 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)

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that's the whole squad 💀 yes there really are that many. group chat is loud but she's worth it 🫶

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and that's a wrap bestie!! 🌈 this little page came out of ./include/linux/atomic, dated October 2026, and it's filed under raw_atomic64_dec_return(9) in the Kernel API Manual 💖 slay, go decrement something atomically ✨🎀