[PATCH 7/8] 8xx: Restore _PAGE_WRITETHRU

[Joakim Tjernlund]

Benjamin Herrenschmidt <benh at kernel.crashing.org> wrote on 11/10/2009 23:26:27:
>
> On Sun, 2009-10-11 at 18:35 +0200, Joakim Tjernlund wrote:
> > 8xx has not had WRITETHRU due to lack of bits in the pte.
> > After the recent rewrite of the 8xx TLB code, there are
> > two bits left. Use one of them to WRITETHRU.
> >
> > Perhaps use the last SW bit to PAGE_SPECIAL or PAGE_FILE?
>
> _PAGE_FILE can already overwrite other bits as it's only set
> when !present, and should pretty much always be 0x2

OK.

>
> I think I've replaced _PAGE_EXEC with _PAGE_SPECIAL already
> upstream since _PAGE_EXEC is unused on 8xx.

What is page SPECIAL anyway?