sudo find / -name *lse*.h
found
/usr/src/kernels/5.15.54-25.126.amzn2022.aarch64/arch/arm64/include/asm/lse.h
/usr/src/kernels/5.15.54-25.126.amzn2022.aarch64/arch/arm64/include/asm/atomic_lse.h
aeron use this extensively on atomic.h using AERON_CPU_X64 flags
