Porting Lua 5.2.2 to ARM is just a matter of recompiling for the target CPU. This is my first port for Maemo running on Nokia N900 which has an OMAP 3430 ARM Cortex A8 SoC. The armel debian package can be downloaded from Maemo Garage. I have yet to explore on submitting to maemo-devel. It's compiled to run on any POSIX compliant OS running on ARM.
The install paths are as follows: lua, luac goes to /usr/local/bin/ and liblua.a goes to /usr/local/lib.