virtual->physical address translation

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1)  How do I get a pointer to the struct page related
to a given userpace address in the current process?

2)  If that page is swapped out how do I bring it into
memory so I can access it?

  I am trying to bump the reference count on that page
so it won't go away in
do_execve()/load_elf_binary()after the old mm is destroyed.

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