Re: [PATCH] Tight check of pfn_valid on sparsemem - v4

[Christoph Lameter]

On Tue, 27 Jul 2010, Minchan Kim wrote:

> But in fact I have a concern to use PG_reserved since it can be used
> afterward pfn_valid normally to check hole in non-hole system. So I
> think it's redundant.

PG_reserved is already used to mark pages not handled by the page
allocator (see mmap_init_zone).


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