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udp: Use hlist_nulls in UDP RCU code

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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>
This commit is contained in:
Eric Dumazet
2008-11-16 19:39:21 -08:00
committed by David S. Miller
parent bbaffaca48
commit 88ab1932ea
5 changed files with 83 additions and 66 deletions
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include/net/udp.h
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@@ -51,7 +51,7 @@ struct udp_skb_cb {
#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 {