[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>

1 files changed, 7 insertions, 4 deletions

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);