提交 27f39c73 编写于 作者: E Eric Dumazet 提交者: David S. Miller

net: Use __this_cpu_inc() in fast path

This patch saves 224 bytes of text on my machine.

__this_cpu_inc() generates a single instruction, using no scratch
registers :

  65 ff 04 25 a8 30 01 00      incl   %gs:0x130a8

instead of :

  48 c7 c2 80 30 01 00         mov    $0x13080,%rdx
  65 48 8b 04 25 88 ea 00 00   mov    %gs:0xea88,%rax
  83 44 10 28 01               addl   $0x1,0x28(%rax,%rdx,1)
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 604c1b18
...@@ -2822,8 +2822,7 @@ static int __netif_receive_skb(struct sk_buff *skb) ...@@ -2822,8 +2822,7 @@ static int __netif_receive_skb(struct sk_buff *skb)
skb->dev = master; skb->dev = master;
} }
__get_cpu_var(softnet_data).processed++; __this_cpu_inc(softnet_data.processed);
skb_reset_network_header(skb); skb_reset_network_header(skb);
skb_reset_transport_header(skb); skb_reset_transport_header(skb);
skb->mac_len = skb->network_header - skb->mac_header; skb->mac_len = skb->network_header - skb->mac_header;
......
...@@ -253,8 +253,7 @@ static unsigned rt_hash_mask __read_mostly; ...@@ -253,8 +253,7 @@ static unsigned rt_hash_mask __read_mostly;
static unsigned int rt_hash_log __read_mostly; static unsigned int rt_hash_log __read_mostly;
static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
#define RT_CACHE_STAT_INC(field) \ #define RT_CACHE_STAT_INC(field) __this_cpu_inc(rt_cache_stat.field)
(__raw_get_cpu_var(rt_cache_stat).field++)
static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx, static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx,
int genid) int genid)
......
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