Store the physical pgd address in a different variable than the virtual
address.

There's no real reason to only use 1 variable here, other than saving a
line of code.  But, the types really are different and we might as well
just spell that out explicitly.
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>