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Add i8/i16 atomic try_cmpxchg helpers that call try_cmpxchg() macro implementing atomic try_cmpxchg using architecture-specific instructions. [boqun: Add comments explaining CONFIG_ARCH_SUPPORTS_ATOMIC_RMW and use try_cmpxchg() instead of raw_try_cmpxchg()] Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Link: https://patch.msgid.link/20251227115951.1424458-2-fujita.tomonori@gmail.com