mm, hugetlb, soft_offline: use new_page_nodemask for soft offline migration

new_page is yet another duplication of the migration callback which has
to handle hugetlb migration specially.  We can safely use the generic
new_page_nodemask for the same purpose.

Please note that gigantic hugetlb pages do not need any special handling
because alloc_huge_page_nodemask will make sure to check pages in all
per node pools.  The reason this was done previously was that
alloc_huge_page_node treated NO_NUMA_NODE and a specific node
differently and so alloc_huge_page_node(nid) would check on this
specific node.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Michal Hocko <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Reported-by: Vlastimil Babka <[email protected]>
Reviewed-by: Mike Kravetz <[email protected]>
Tested-by: Mike Kravetz <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: Michal Hocko

mm/memory-failure.c

@@ -1484,16 +1484,8 @@ EXPORT_SYMBOL(unpoison_memory);
 static struct page *new_page(struct page *p, unsigned long private, int **x)
 {
 	int nid = page_to_nid(p);
-	if (PageHuge(p)) {
-		struct hstate *hstate = page_hstate(compound_head(p));
 
-		if (hstate_is_gigantic(hstate))
-			return alloc_huge_page_node(hstate, NUMA_NO_NODE);
-
-		return alloc_huge_page_node(hstate, nid);
-	} else {
-		return __alloc_pages_node(nid, GFP_HIGHUSER_MOVABLE, 0);
-	}
+	return new_page_nodemask(p, nid, &node_states[N_MEMORY]);
 }
 
 /*