[PATCH 1/3] Add a new member name to structure irq_host

[Zhang Wei-r63237]

Hi, Ben,

Thanks! 

> Sure, hence the word 'optional' which would provide a default name.
> 

About the default name, since platforms we touched are very limited, we
do not know which name should be proper default name. We just assign
those default name to 'NULL'  for passing the compiling process. And the
platform maintain can correct it.

Cheers!
Wei.