ppc64: add in hugetlb quota fixes

arch/ppc64/mm/hugetlbpage.c

@@ -507,14 +507,21 @@ int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
 			+ (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
 		page = find_get_page(mapping, idx);
 		if (!page) {
+			/* charge the fs quota first */
+			if (hugetlb_get_quota(mapping)) {
+				ret = -ENOMEM;
+				goto out;
+			}
 			page = alloc_hugetlb_page();
 			if (!page) {
+				hugetlb_put_quota(mapping);
 				ret = -ENOMEM;
 				goto out;
 			}
 			ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC);
 			unlock_page(page);
 			if (ret) {
+				hugetlb_put_quota(mapping);
 				free_huge_page(page);
 				goto out;
 			}