xen-netfront: remove dead code

@@ -209,11 +209,9 @@ static void xennet_alloc_rx_buffers(stru
 	struct page *page;
 	int i, batch_target, notify;
 	RING_IDX req_prod = np->rx.req_prod_pvt;
-	struct xen_memory_reservation reservation;
 	grant_ref_t ref;
 	unsigned long pfn;
 	void *vaddr;
-	int nr_flips;
 	struct xen_netif_rx_request *req;
 
 	if (unlikely(!netif_carrier_ok(dev)))

@@ -263,7 +261,7 @@ no_skb:
 		np->rx_target = np->rx_max_target;
 
  refill:
-	for (nr_flips = i = 0; ; i++) {
+	for (i = 0; ; i++) {
 		skb = __skb_dequeue(&np->rx_batch);
 		if (skb == NULL)
 			break;

@@ -292,38 +290,7 @@ no_skb:
 		req->gref = ref;
 	}
 
-	if (nr_flips != 0) {
-		reservation.extent_start = np->rx_pfn_array;
-		reservation.nr_extents   = nr_flips;
-		reservation.extent_order = 0;
-		reservation.address_bits = 0;
-		reservation.domid        = DOMID_SELF;
-
-		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
-			/* After all PTEs have been zapped, flush the TLB. */
-			np->rx_mcl[i-1].args[MULTI_UVMFLAGS_INDEX] =
-				UVMF_TLB_FLUSH|UVMF_ALL;
-
-			/* Give away a batch of pages. */
-			np->rx_mcl[i].op = __HYPERVISOR_memory_op;
-			np->rx_mcl[i].args[0] = XENMEM_decrease_reservation;
-			np->rx_mcl[i].args[1] = (unsigned long)&reservation;
-
-			/* Zap PTEs and give away pages in one big
-			 * multicall. */
-			(void)HYPERVISOR_multicall(np->rx_mcl, i+1);
-
-			/* Check return status of HYPERVISOR_memory_op(). */
-			if (unlikely(np->rx_mcl[i].result != i))
-				panic("Unable to reduce memory reservation\n");
-		} else {
-			if (HYPERVISOR_memory_op(XENMEM_decrease_reservation,
-						 &reservation) != i)
-				panic("Unable to reduce memory reservation\n");
-		}
-	} else {
-		wmb();		/* barrier so backend seens requests */
-	}
+	wmb();		/* barrier so backend seens requests */
 
 	/* Above is a suitable barrier to ensure backend will see requests. */
 	np->rx.req_prod_pvt = req_prod + i;