[PATCH] powerpc: Add macros for the ibm_architecture_vec[] lengths

[Michael Ellerman]

On Tue, 2014-09-09 at 11:03 +1000, Stewart Smith wrote:
> Michael Ellerman <mpe at ellerman.id.au> writes:
> > The encoding of the lengths in the ibm_architecture_vec array is
> > "interesting" to say the least. It's non-obvious how the number of bytes
> > we provide relates to the length value.
> >
> > In fact we already got it wrong once, see 11e9ed43ca8a "Fix up
> > ibm_architecture_vec definition".
> >
> > So add some macros to make it (hopefully) clearer. These at least have
> > the property that the integer present in the code is equal to the number
> > of bytes that follows it.
> >
> > Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> 
> Seems at least as correct as the code was before... so,
> 
> Reviewed-by: Stewart Smith <stewart at linux.vnet.ibm.com>
> 
> (not actually compiled or tested or anything, but my internal C
> preprocesser says it looks okay :)

Thanks for the review, it's one of those patches it would be easy to get wrong
because it's so simple in theory.

As a test I deliberately broke the NUM_VECTORS value, and .. my system booted
just fine! So I think I'll give this a bit more scrutiny and work out what's
going on there first :)

cheers