mm: preserve original node for transparent huge page copies

This makes a difference for LOCAL policy, where the node cannot be
determined from the policy itself, but has to be gotten from the original
page.
Acked-by: NAndrea Arcangeli <aarcange@redhat.com>
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Reviewed-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/huge_memory.c

@@ -799,8 +799,8 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
 	}
 
 	for (i = 0; i < HPAGE_PMD_NR; i++) {
-		pages[i] = alloc_page_vma(GFP_HIGHUSER_MOVABLE,
-					  vma, address);
+		pages[i] = alloc_page_vma_node(GFP_HIGHUSER_MOVABLE,
+					       vma, address, page_to_nid(page));
 		if (unlikely(!pages[i] ||
 			     mem_cgroup_newpage_charge(pages[i], mm,
 						       GFP_KERNEL))) {