mm-introduce-a-common-interface-for-balloon-pages-mobility-fix

mm-introduce-a-common-interface-for-balloon-pages-mobility-fix

fix build with CONFIG_BALLOON_COMPACTION=n

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>