[SK_BUFF]: Convert skb->end to sk_buff_data_t

Now to convert the last one, skb->data, that will allow many simplifications
and removal of some of the offset helpers.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 5 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index e1c2392ecb56..656dc0e901cc 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -305,9 +305,9 @@ struct sk_buff {
         sk_buff_data_t          mac_header;
         /* These elements must be at the end, see alloc_skb() for details.  */
         sk_buff_data_t          tail;
+        sk_buff_data_t          end;
         unsigned char           *head,
-                                *data,
-                                *end;
+                                *data;
         unsigned int            truesize;
         atomic_t                users;
 };
@@ -392,8 +392,20 @@ extern unsigned int   skb_find_text(struct sk_buff *skb, unsigned int from,
                                     unsigned int to, struct ts_config *config,
                                     struct ts_state *state);
 
+#ifdef NET_SKBUFF_DATA_USES_OFFSET
+static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
+{
+        return skb->head + skb->end;
+}
+#else
+static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
+{
+        return skb->end;
+}
+#endif
+
 /* Internal */
-#define skb_shinfo(SKB)         ((struct skb_shared_info *)((SKB)->end))
+#define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB)))
 
 /**
  *      skb_queue_empty - check if a queue is empty
@@ -843,6 +855,7 @@ static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
 {
         skb->tail = skb->data + offset;
 }
+
 #endif /* NET_SKBUFF_DATA_USES_OFFSET */
 
 /*
@@ -872,7 +885,7 @@ static inline unsigned char *skb_put(struct sk_buff *skb, unsigned int len)
         SKB_LINEAR_ASSERT(skb);
         skb->tail += len;
         skb->len  += len;
-        if (unlikely(skb_tail_pointer(skb) > skb->end))
+        if (unlikely(skb->tail > skb->end))
                 skb_over_panic(skb, len, current_text_addr());
         return tmp;
 }
@@ -968,7 +981,7 @@ static inline int skb_headroom(const struct sk_buff *skb)
  */
 static inline int skb_tailroom(const struct sk_buff *skb)
 {
-        return skb_is_nonlinear(skb) ? 0 : skb->end - skb_tail_pointer(skb);
+        return skb_is_nonlinear(skb) ? 0 : skb->end - skb->tail;
 }
 
 /**