Hello Liming,
Yes this check is only done for '.h' files. Cf the bit of code from the same file:

if os.path.splitext(F)[1] in ('.h'):
self.NamingConventionCheckIfndefStatement(FileTable)

I think this is normal, the format of the initial 'ifndef' needs to be formatted as 'Name_', but not necessarilly all the other 'ifndef' in the file.
I added the arm copyright two times, I will submit a v2 if the patch goes forward.

Regards,
Pierre