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net: don't bother calling list RX functions on empty lists 

Generally the check should be very cheap, as the sk_buff_head is in cache.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2018-07-02 16:14:44 +01:00 committed by David S. Miller
parent 5fa12739a5
commit b9f463d6c9
1 changed files with 6 additions and 2 deletions
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8
net/core/dev.c
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@ -4887,7 +4887,8 @@ static void __netif_receive_skb_list(struct list_head *head)
/* Handle the previous sublist */
list_cut_before(&sublist, head, &skb->list);
__netif_receive_skb_list_core(&sublist, pfmemalloc);
if (!list_empty(&sublist))
__netif_receive_skb_list_core(&sublist, pfmemalloc);
pfmemalloc = !pfmemalloc;
/* See comments in __netif_receive_skb */
if (pfmemalloc)
@ -4897,7 +4898,8 @@ static void __netif_receive_skb_list(struct list_head *head)
}
}
/* Handle the remaining sublist */
__netif_receive_skb_list_core(head, pfmemalloc);
if (!list_empty(head))
__netif_receive_skb_list_core(head, pfmemalloc);
/* Restore pflags */
if (pfmemalloc)
memalloc_noreclaim_restore(noreclaim_flag);
@ -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);