+ if (PageHuge(page) && cc->alloc_contig) {
+ ret = isolate_or_dissolve_huge_page(page, &cc->migratepages);
+
+ /*
+ * Fail isolation in case isolate_or_dissolve_huge_page()
+ * reports an error. In case of -ENOMEM, abort right away.
+ */
+ if (ret < 0) {
+ /* Do not report -EBUSY down the chain */
+ if (ret == -EBUSY)
+ ret = 0;
+ low_pfn += (1UL << compound_order(page)) - 1;
+ goto isolate_fail;
+ }
+
+ if (PageHuge(page)) {
+ /*
+ * Hugepage was successfully isolated and placed
+ * on the cc->migratepages list.
+ */
+ low_pfn += compound_nr(page) - 1;
+ goto isolate_success_no_list;
+ }
+
+ /*
+ * Ok, the hugepage was dissolved. Now these pages are
+ * Buddy and cannot be re-allocated because they are
+ * isolated. Fall-through as the check below handles
+ * Buddy pages.
+ */
+ }
+