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Subject: Re: [PATCH 7/8] 8xx: Restore _PAGE_WRITETHRU
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Joakim Tjernlund <joakim.tjernlund@transmode.se>
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Date: Mon, 12 Oct 2009 09:45:30 +1100
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Cc: Scott Wood <scottwood@freescale.com>,
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	Rex Feany <RFeany@mrv.com>
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On Mon, 2009-10-12 at 00:21 +0200, Joakim Tjernlund wrote:
> > I think I've replaced _PAGE_EXEC with _PAGE_SPECIAL already
> > upstream since _PAGE_EXEC is unused on 8xx.
> 
> What is page SPECIAL anyway? 

It's used on newer kernels to indicates PTEs that map something that
isn't backed by a struct page (ie, not memory)

Cheers,
Ben.