mm: thp: cleanup: mv alloc_hugepage to better place

mm: thp: cleanup: mv alloc_hugepage to better place

Move alloc_hugepage() to a better place, no need for a seperate #ifndef
CONFIG_NUMA

Signed-off-by: Bob Liu <[email protected]>
Reviewed-by: Yasuaki Ishimatsu <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Andrew Davidoff <[email protected]>
Cc: Wanpeng Li <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>