[PATCH] add page lookup to page command

[Anton Blanchard]

Hi Linas,

> The attached patch adds support for automatic struct page * lookup
> for the 'page' command.  By typing 'page -s <vaddr>', it will find
> the mem_map[] entry that corresponds to vaddr, and display that.
> (To do this manually is a bit tedious; besides chasing non-exported
> symbols in System.map, one has to do some hex multiplication by
> sizeof(struct page); so this patch automates that.)

We cant play with mem_map directly when NUMA/DISCONTIGMEM is enabled,
check out discontigmem_pfn_to_page for the nasty details.

Anton

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