mm: use zone and order instead of free area in free_list manipulators

In order to enable the use of the zone from the list manipulator functions
I will need access to the zone pointer.  As it turns out most of the
accessors were always just being directly passed &zone->free_area[order]
anyway so it would make sense to just fold that into the function itself
and pass the zone and order as arguments instead of the free area.

In order to be able to reference the zone we need to move the declaration
of the functions down so that we have the zone defined before we define
the list manipulation functions.  Since the functions are only used in the
file mm/page_alloc.c we can just move them there to reduce noise in the
header.

Signed-off-by: Alexander Duyck <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Reviewed-by: Dan Williams <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Reviewed-by: Pankaj Gupta <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Luiz Capitulino <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Nitesh Narayan Lal <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Wei Wang <[email protected]>
Cc: Yang Zhang <[email protected]>
Cc: wei qi <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

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