exported version of page_is_ram?

["Timur Alperovich" <timur.alperovich@gmail.com>]

Hi,

I need to check if a given page is in ram or not. It seems that
page_is_ram does the trick, but since it's not exported, I end up with
"unknown symbol" errors when I try to insert the module. I'm trying to
hash the contents of every page in physical memory, and iterating
through pages from 0 to num_physpages, while checking if they are
actually in ram seemed reasonable. Is there a better way to do it or
is there another function rather than page_is_ram that can do the
trick?

Thank you,
Timur