Re: [PATCH 7/8] mm: reinstate ZERO_PAGE

[Linus Torvalds]

On Tue, 8 Sep 2009, Nick Piggin wrote:
> 
> Without looking closely, why is it a big problem to have a
> !HAVE PTE SPECIAL case? Couldn't it just be a check for
> pfn == zero_pfn that is conditionally compiled away for pte
> special architectures anyway?

At least traditionally, there wasn't a single zero_pfn, but multiple (for 
VIPT caches that have performance issues with aliases). But yeah, we could 
check just the pfn number, and allow any architecture to do it.

			Linus
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