[SK_BUFF]: Introduce skb_copy_to_linear_data{_offset}

To clearly state the intent of copying to linear sk_buffs, _offset being a
overly long variant but interesting for the sake of saving some bytes.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>

3 files changed, 12 insertions, 9 deletions

diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index a1686dfcbb9a..0e9f00c5c899 100644
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -173,7 +173,7 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
 	}
 	skb_push(skb, minheadroom);
 	if (brvcc->encaps == e_llc)
-		memcpy(skb->data, llc_oui_pid_pad, 10);
+		skb_copy_to_linear_data(skb, llc_oui_pid_pad, 10);
 	else
 		memset(skb->data, 0, 2);
 #endif /* FASTER_VERSION */
diff --git a/net/atm/lec.c b/net/atm/lec.c
index 4b3e72f31b3b..6d63afa5764d 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -576,8 +576,8 @@ static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 					break;
 				}
 				skb2->len = sizeof(struct atmlec_msg);
-				memcpy(skb2->data, mesg,
-				       sizeof(struct atmlec_msg));
+				skb_copy_to_linear_data(skb2, mesg,
+							sizeof(*mesg));
 				atm_force_charge(priv->lecd, skb2->truesize);
 				sk = sk_atm(priv->lecd);
 				skb_queue_tail(&sk->sk_receive_queue, skb2);
@@ -1337,7 +1337,7 @@ static int lane2_resolve(struct net_device *dev, u8 *dst_mac, int force,
 		if (skb == NULL)
 			return -1;
 		skb->len = *sizeoftlvs;
-		memcpy(skb->data, *tlvs, *sizeoftlvs);
+		skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
 		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
 	}
 	return retval;
@@ -1371,7 +1371,7 @@ static int lane2_associate_req(struct net_device *dev, u8 *lan_dst,
 	if (skb == NULL)
 		return 0;
 	skb->len = sizeoftlvs;
-	memcpy(skb->data, tlvs, sizeoftlvs);
+	skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
 	retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
 	if (retval != 0)
 		printk("lec.c: lane2_associate_req() failed\n");
diff --git a/net/atm/mpc.c b/net/atm/mpc.c
index 4d2592c14090..813e08d6dc7c 100644
--- a/net/atm/mpc.c
+++ b/net/atm/mpc.c
@@ -504,11 +504,13 @@ static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
 		tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
 		skb_pull(skb, ETH_HLEN);                       /* get rid of Eth header */
 		skb_push(skb, sizeof(tagged_llc_snap_hdr));    /* add LLC/SNAP header   */
-		memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
+		skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
+					sizeof(tagged_llc_snap_hdr));
 	} else {
 		skb_pull(skb, ETH_HLEN);                        /* get rid of Eth header */
 		skb_push(skb, sizeof(struct llc_snap_hdr));     /* add LLC/SNAP header + tag  */
-		memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
+		skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
+					sizeof(struct llc_snap_hdr));
 	}
 
 	atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
@@ -711,7 +713,8 @@ static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
 		return;
 	}
 	skb_push(new_skb, eg->ctrl_info.DH_length);     /* add MAC header */
-	memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
+	skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
+				eg->ctrl_info.DH_length);
 	new_skb->protocol = eth_type_trans(new_skb, dev);
 	skb_reset_network_header(new_skb);
 
@@ -936,7 +939,7 @@ int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
 	if (skb == NULL)
 		return -ENOMEM;
 	skb_put(skb, sizeof(struct k_message));
-	memcpy(skb->data, mesg, sizeof(struct k_message));
+	skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
 	atm_force_charge(mpc->mpoad_vcc, skb->truesize);
 
 	sk = sk_atm(mpc->mpoad_vcc);