Re: mm: BUG in do_huge_pmd_wp_page

[H. Peter Anvin]

On 04/10/2013 01:02 AM, Minchan Kim wrote:
> 
> When I am looking at the code, I was wonder about the logic of GHZP(aka,
> get_huge_zero_page) reference handling. The logic depends on that page
> allocator never alocate PFN 0.
> 
> Who makes sure it? What happens if allocator allocates PFN 0?
> I don't know all of architecture makes sure it.
> You investigated it for all arches?
> 

This isn't manifest, right?  At least on x86 we should never, ever
allocate PFN 0.

	-hpa


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