raw_atomic_cmpxchg_acquire(9)

🎀 NAME 🎀

raw_atomic_cmpxchg_acquire(9) from the Kernel API Manual — bestie, it’s the atomic compare-and-exchange situation, but with acquire ordering. It’s giving “only swap if the value matches” energy. 💅✨

💖 SYNOPSIS 💖

int raw_atomic_cmpxchg_acquire (atomic_t *v , int old , int new );

🫶 ARGUMENTS 🫶

• v — pointer to atomic_t. This is the main character you’re comparing and maybe updating.
• old — the int value to compare with. The “are you the one?” of it all.
• new — the int value to assign. The glow-up waiting in the wings.

🌸 DESCRIPTION 🌸

Okay so picture this: if (v == old), it atomically updates v to new with acquire ordering. Slay. Otherwise, v is not modified and relaxed ordering is provided. No cap, that’s the whole vibe.

Safe to use in noinstr code; prefer atomic_cmpxchg_acquire elsewhere. Noted, bestie. 🫡

🔥 RETURN 🔥

The original value of v. Periodt. That’s what you get back. 💖

🦋 SEE ALSO 🦋

• Kernel file ./include/linux/atomic/atomic-arch-fallback.h
• 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_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(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)

That’s the whole page, bestie: source/version ./include/linux/atomic, dated October 2026, manual page raw_atomic_cmpxchg_acquire(9). Mwah 💋✨