lock_page(hpage);
+ /*
+ * The page could have changed compound pages during the locking.
+ * If this happens just bail out.
+ */
+ if (compound_head(p) != hpage) {
+ action_result(pfn, "different compound page after locking", IGNORED);
+ res = -EBUSY;
+ goto out;
+ }
+
/*
* We use page flags to determine what action should be taken, but
* the flags can be modified by the error containment action. One