net: sock_free() optimizations

Avoid two extra instructions in sock_free(), to reload
skb->truesize and skb->sk

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index fef2434b7c8c..363bc260157c 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1339,9 +1339,10 @@ EXPORT_SYMBOL(sock_wfree);
 void sock_rfree(struct sk_buff *skb)
 {
         struct sock *sk = skb->sk;
+        unsigned int len = skb->truesize;
 
-        atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
-        sk_mem_uncharge(skb->sk, skb->truesize);
+        atomic_sub(len, &sk->sk_rmem_alloc);
+        sk_mem_uncharge(sk, len);
 }
 EXPORT_SYMBOL(sock_rfree);