net: don't bother calling list RX functions on empty lists (b9f463d6) · Commits · 戴 / test

net/core/dev.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -4887,6 +4887,7 @@ static void __netif_receive_skb_list(struct list_head *head)

		/* Handle the previous sublist */
		list_cut_before(&sublist, head, &skb->list);
		if (!list_empty(&sublist))
		__netif_receive_skb_list_core(&sublist, pfmemalloc);
		pfmemalloc = !pfmemalloc;
		/* See comments in __netif_receive_skb */
		@@ -4897,6 +4898,7 @@ static void __netif_receive_skb_list(struct list_head *head)
		}
		}
		/* Handle the remaining sublist */
		if (!list_empty(head))
		__netif_receive_skb_list_core(head, pfmemalloc);
		/* Restore pflags */
		if (pfmemalloc)
		@@ -5058,6 +5060,8 @@ void netif_receive_skb_list(struct list_head *head)
		{
		struct sk_buff *skb;

		if (list_empty(head))
		return;
		list_for_each_entry(skb, head, list)
		trace_netif_receive_skb_list_entry(skb);
		netif_receive_skb_list_internal(head);