[PATCH 1/2] powerpc: add 16K/64K pages support for the 44x PPC32 architectures.

[Benjamin Herrenschmidt]

On Mon, 2008-11-03 at 06:26 -0500, Josh Boyer wrote:
> On Mon, 03 Nov 2008 11:43:54 +1100
> Benjamin Herrenschmidt <benh at kernel.crashing.org> wrote:
> 
> > 
> > > Cropping the size of the memory node.  That was simplest to do from the
> > > cuboot wrapper at the time.  If marking it reserved via a reserve map
> > > is more elegant and correct, we could do that.
> > > 
> > > But I will still like to know what about the other way is hairy please.
> > 
> > I don't like it :-) Bad feeling ... don't like having a memory
> > node entry that isn't aligned to some large power of two typically.
> 
> Erm, ok.  And does your heebie-geebies extend to people using the mem=
> parameter in a similar fashion?

Nah, not really. It's not that it won't work, I suppose it does, though
I would have preferred a way to "reserve" that memory rather than take
it off. In fact, that last page could be used for other things, for
example it could be used as a dummy page to point stale DMA to or
whatever else.

Ben.