[PATCH 1/2] Add framework for tunables

[DJ Delorie]

Siddhesh Poyarekar <siddhesh@sourceware.org> writes:
>> You do not need __ prefixes on macro arguments.
>
> I did it out of habit to avoid namespace collisions, but it's not
> necessary here so I'll remove it.

I've been burned by unprotected parameter names in headers too (although
not macros); it's a good habit to include the underscores, even if not
needed.