[NET]: Store skb->timestamp as offset to a base timestamp

Reduces skb size by 8 bytes on 64-bit.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 00d32b7c8266..3868a8d70cc0 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1362,6 +1362,7 @@ struct sctp_association *sctp_unpack_cookie(
         char *key;
         sctp_scope_t scope;
         struct sk_buff *skb = chunk->skb;
+        struct timeval tv;
 
         headersize = sizeof(sctp_chunkhdr_t) + SCTP_SECRET_SIZE;
         bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
@@ -1434,7 +1435,8 @@ no_hmac:
          * an association, there is no need to check cookie's expiration
          * for init collision case of lost COOKIE ACK.
          */
-        if (!asoc && tv_lt(bear_cookie->expiration, skb->stamp)) {
+        skb_get_timestamp(skb, &tv);
+        if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
                 __u16 len;
                 /*
                  * Section 3.3.10.3 Stale Cookie Error (3)
@@ -1447,10 +1449,9 @@ no_hmac:
                 len = ntohs(chunk->chunk_hdr->length);
                 *errp = sctp_make_op_error_space(asoc, chunk, len);
                 if (*errp) {
-                        suseconds_t usecs = (skb->stamp.tv_sec -
+                        suseconds_t usecs = (tv.tv_sec -
                                 bear_cookie->expiration.tv_sec) * 1000000L +
-                                skb->stamp.tv_usec -
-                                bear_cookie->expiration.tv_usec;
+                                tv.tv_usec - bear_cookie->expiration.tv_usec;
 
                         usecs = htonl(usecs);
                         sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,