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Add i8/i16 atomic xchg_acquire helpers that call xchg_acquire() macro implementing atomic xchg_acquire using architecture-specific instructions. [boqun: Use xchg_acquire() instead of raw_xchg_acquire()] Reviewed-by: Alice Ryhl <aliceryhl@google.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Link: https://patch.msgid.link/20251223062140.938325-3-fujita.tomonori@gmail.com