[Skiboot] [PATCH v2 4/5] external/opal-prd: Support manufacturing command HTMGT and attribute override

[Stewart Smith]

Patrick Williams <patrick at stwcx.xyz> writes:
> The Hostboot version of this file says the following:
>
> https://github.com/open-power/hostboot/blob/master/src/include/runtime/interface.h#L308
>
> // Reserve some space for future growth.
> // do NOT ever change this number, even if you add functions.
> //
> // The value of 32 was somewhat arbitrarily chosen.
> //
> // If either side modifies the interface.h file we're suppose to be able to
> // tolerate the other side not supporting the function yet.  The function
> // pointer can be NULL.  So if we require a new interface from OPAL,
> // like "read_iic", we need to be able to tolerate that function pointer
> // being NULL and do something sane (and erroring out is not consider sane).
> //
> // The purpose of this is to give us the ability to update Hostboot and
> // OPAL independently.  It is pretty rare that we both have function ready
> // at the same time.  The "reserve" is there so that the structures are
> // allocated with sufficient space and populated with NULL function pointers.
> // 32 is big enough that we should not likely add that many functions from
> // either direction in between any two levels of support.
>
> Is there a reason why this file isn't just copied verbatim from
> Hostboot?

I can't see one myself, and it probably makes sense for it to be
identical.

I'm happy for a patch to make them identical to come after this series
though.