[SK_BUFF]: Introduce skb_copy_from_linear_data{_offset}

To clearly state the intent of copying from 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 <[email protected]>

Author: acmel

arch/ia64/sn/kernel/xpnet.c

@@ -566,7 +566,8 @@ xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 			msg->version = XPNET_VERSION_EMBED;
 			dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n",
 				&msg->data, skb->data, (size_t) embedded_bytes);
-			memcpy(&msg->data, skb->data, (size_t) embedded_bytes);
+			skb_copy_from_linear_data(skb, &msg->data,
+						  (size_t)embedded_bytes);
 		} else {
 			msg->version = XPNET_VERSION;
 		}

drivers/atm/atmtcp.c

@@ -221,7 +221,7 @@ static int atmtcp_v_send(struct atm_vcc *vcc,struct sk_buff *skb)
 	hdr->vpi = htons(vcc->vpi);
 	hdr->vci = htons(vcc->vci);
 	hdr->length = htonl(skb->len);
-	memcpy(skb_put(new_skb,skb->len),skb->data,skb->len);
+	skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len);
 	if (vcc->pop) vcc->pop(vcc,skb);
 	else dev_kfree_skb(skb);
 	out_vcc->push(out_vcc,new_skb);
@@ -310,7 +310,7 @@ static int atmtcp_c_send(struct atm_vcc *vcc,struct sk_buff *skb)
 		goto done;
 	}
 	__net_timestamp(new_skb);
-	memcpy(skb_put(new_skb,skb->len),skb->data,skb->len);
+	skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len);
 	out_vcc->push(out_vcc,new_skb);
 	atomic_inc(&vcc->stats->tx);
 	atomic_inc(&out_vcc->stats->rx);