- BUG_ON(ret != 1);
- } else {
- ret = apply_to_page_range(&init_mm, vstart, PAGE_SIZE << order,
- dealloc_pte_fn, NULL);
- if (ret == -ENOSYS)
+
+ vaddr = (unsigned long)page_address(page);
+
+ scrub_pages(vaddr, 1);
+
+ balloon_lock(flags);
+
+ if (xen_feature(XENFEAT_auto_translated_physmap)) {
+ unsigned long gmfn = page_to_pfn(page);
+ struct xen_memory_reservation reservation = {
+ .nr_extents = 1,
+ .extent_order = 0,
+ .domid = DOMID_SELF
+ };
+ set_xen_guest_handle(reservation.extent_start, &gmfn);
+ ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
+ &reservation);
+ if (ret == 1)
+ ret = 0; /* success */
+ } else {
+ ret = apply_to_page_range(&init_mm, vaddr, PAGE_SIZE,
+ dealloc_pte_fn, NULL);
+ }
+
+ if (ret != 0) {
+ balloon_unlock(flags);
+ __free_page(page);