Messages in this thread Patch in this message | | | From | Jesper Juhl <> | Subject | [PATCH] Decrease number of pointer derefs in connection.c | Date | Thu, 8 Dec 2005 23:36:36 +0100 |
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Hi,
Here's a small patch to decrease the number of pointer derefs in net/rxrpc/connection.c
Benefits of the patch: - Fewer pointer dereferences should make the code slightly faster. - Size of generated code is smaller - improved readability
Please consider applying.
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> ---
net/rxrpc/connection.c | 14 ++++++++------ 1 files changed, 8 insertions(+), 6 deletions(-)
orig: text data bss dec hex filename 7146 40 4 7190 1c16 net/rxrpc/connection.o
patched: text data bss dec hex filename 7140 40 4 7184 1c10 net/rxrpc/connection.o
--- linux-2.6.15-rc5-git1-orig/net/rxrpc/connection.c 2005-10-28 02:02:08.000000000 +0200 +++ linux-2.6.15-rc5-git1/net/rxrpc/connection.c 2005-12-08 20:29:15.000000000 +0100 @@ -220,6 +220,7 @@ int rxrpc_connection_lookup(struct rxrpc { struct rxrpc_connection *conn, *candidate = NULL; struct list_head *_p; + struct sk_buff *pkt = msg->pkt; int ret, fresh = 0; __be32 x_epoch, x_connid; __be16 x_port, x_servid; @@ -229,10 +230,10 @@ int rxrpc_connection_lookup(struct rxrpc _enter("%p{{%hu}},%u,%hu", peer, peer->trans->port, - ntohs(msg->pkt->h.uh->source), + ntohs(pkt->h.uh->source), ntohs(msg->hdr.serviceId)); - x_port = msg->pkt->h.uh->source; + x_port = pkt->h.uh->source; x_epoch = msg->hdr.epoch; x_clflag = msg->hdr.flags & RXRPC_CLIENT_INITIATED; x_connid = htonl(ntohl(msg->hdr.cid) & RXRPC_CIDMASK); @@ -267,7 +268,7 @@ int rxrpc_connection_lookup(struct rxrpc /* fill in the specifics */ candidate->addr.sin_family = AF_INET; candidate->addr.sin_port = x_port; - candidate->addr.sin_addr.s_addr = msg->pkt->nh.iph->saddr; + candidate->addr.sin_addr.s_addr = pkt->nh.iph->saddr; candidate->in_epoch = x_epoch; candidate->out_epoch = x_epoch; candidate->in_clientflag = RXRPC_CLIENT_INITIATED; @@ -675,6 +676,7 @@ int rxrpc_conn_receive_call_packet(struc struct rxrpc_message *msg) { struct rxrpc_message *pmsg; + struct dst_entry *dst; struct list_head *_p; unsigned cix, seq; int ret = 0; @@ -710,10 +712,10 @@ int rxrpc_conn_receive_call_packet(struc call->pkt_rcv_count++; - if (msg->pkt->dst && msg->pkt->dst->dev) + dst = msg->pkt->dst; + if (dst && dst->dev) conn->peer->if_mtu = - msg->pkt->dst->dev->mtu - - msg->pkt->dst->dev->hard_header_len; + dst->dev->mtu - dst->dev->hard_header_len; /* queue on the call in seq order */ rxrpc_get_message(msg);
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