atomic64_inc_and_test(9)

okay bestie, welcome to atomic64_inc_and_test(9) from the Kernel API Manual 💅✨ this one is a lil atomic counter moment and she eats, no cap.

💖 NAME 💖

atomic64_inc_and_test — atomic increment and test if zero with full ordering 🎀

✨ SYNOPSIS ✨

bool atomic64_inc_and_test (atomic64_t *v );

🎀 ARGUMENTS 🎀

• v — pointer to atomic64_t. Yep, that's the whole vibe: you hand over the address and she does the atomic thing. 🫶

🌸 DESCRIPTION 🌸

She atomically updates v to (v + 1) with full ordering. Like, the increment and the test are one atomic situation — main character energy only. 🔥

Real talk though: this is unsafe to use in noinstr code. Use raw_atomic64_inc_and_test there instead, periodt. 🫶

🦋 RETURN 🦋

Returns true if the resulting value of v is zero, and false otherwise. That's it. That's the tea. 💖

🌈 SEE ALSO 🌈

the whole squad, literally every ref and the kernel file, so nobody gets left on read:

Kernel file ./include/linux/atomic/atomic-instrumented.h 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_acquire(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_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)

shoutout to ./include/linux/atomic, October 2026, and the manual page atomic64_inc_and_test(9) — mwah 💋💅