[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 <acme@redhat.com>

3 files changed, 6 insertions, 5 deletions

diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index adcda8ebee9..0d6002fc77b 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -951,7 +951,7 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
          *      Incoming Call User Data.
          */
         if (skb->len >= 0) {
-                memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
+                skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
                 makex25->calluserdata.cudlength = skb->len;
         }
 
diff --git a/net/x25/x25_in.c b/net/x25/x25_in.c
index b2bbe552a89..ba13248aa1c 100644
--- a/net/x25/x25_in.c
+++ b/net/x25/x25_in.c
@@ -112,8 +112,9 @@ static int x25_state1_machine(struct sock *sk, struct sk_buff *skb, int frametyp
                          *      Copy any Call User Data.
                          */
                         if (skb->len >= 0) {
-                                memcpy(x25->calluserdata.cuddata, skb->data,
-                                       skb->len);
+                                skb_copy_from_linear_data(skb,
+                                              x25->calluserdata.cuddata,
+                                              skb->len);
                                 x25->calluserdata.cudlength = skb->len;
                         }
                         if (!sock_flag(sk, SOCK_DEAD))
diff --git a/net/x25/x25_out.c b/net/x25/x25_out.c
index 6f573785391..bb45e21ffce 100644
--- a/net/x25/x25_out.c
+++ b/net/x25/x25_out.c
@@ -61,7 +61,7 @@ int x25_output(struct sock *sk, struct sk_buff *skb)
 
         if (skb->len - header_len > max_len) {
                 /* Save a copy of the Header */
-                memcpy(header, skb->data, header_len);
+                skb_copy_from_linear_data(skb, header, header_len);
                 skb_pull(skb, header_len);
 
                 frontlen = skb_headroom(skb);
@@ -84,7 +84,7 @@ int x25_output(struct sock *sk, struct sk_buff *skb)
                         len = max_len > skb->len ? skb->len : max_len;
 
                         /* Copy the user data */
-                        memcpy(skb_put(skbn, len), skb->data, len);
+                        skb_copy_from_linear_data(skb, skb_put(skbn, len), len);
                         skb_pull(skb, len);
 
                         /* Duplicate the Header */