hugetlb-use-mmu_gather-instead-of-a-temporary-linked-list-for-accumulating-pages-fix

hugetlb-use-mmu_gather-instead-of-a-temporary-linked-list-for-accumulating-pages-fix

fix CONFIG_HUGETLB_PAGE=n build

mm/memory.c: In function 'unmap_single_vma':
mm/memory.c:1334: error: implicit declaration of function '__unmap_hugepage_range'

Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>