hugetlb: use mmu_gather instead of a temporary linked list for accumulating pages
Use an mmu_gather instead of a temporary linked list for accumulating
pages when we unmap a hugepage range. This also allows us to get rid of
i_mmap_mutex unmap_hugepage_range in the following patch.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>