Re: [PATCH] ppc64: 64K pages support

[Dave Airlie]

> What was the problem with drivers ? On ppc64, it's all hidden in the
> arch code. All the kernel sees is a 64k page size. I extended the PTE to
> contain tracking informations for the 16 sub pages (HPTE bits & hash
> slot index). Sub pages are faulted on demand and flushed all at once,
> but it's all transparent to the generic code.
>

We did that with the VAX port about 5 years ago :-), granted for
different reasons..

The VAX has 512 byte hw pages, we had to make a 4K pagesize for the
kernel by grouping 8 hw pages together and hiding it all in the arch
dir..

granted I don't know if it broke any drivers, we didn't have any...

Dave.
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