udp: Use hlist_nulls in UDP RCU code
This is a straightforward patch, using hlist_nulls infrastructure.
RCUification already done on UDP two weeks ago.
Using hlist_nulls permits us to avoid some memory barriers, both
at lookup time and delete time.
Patch is large because it adds new macros to include/net/sock.h.
These macros will be used by TCP & DCCP in next patch.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/udp.h b/include/net/udp.h
index df2bfe5..90e6ce5 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -51,7 +51,7 @@
#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
struct udp_hslot {
- struct hlist_head head;
+ struct hlist_nulls_head head;
spinlock_t lock;
} __attribute__((aligned(2 * sizeof(long))));
struct udp_table {