[SK_BUFF]: Remove skb_add_mtu() leftovers

Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

include/linux/skbuff.h

@@ -1512,7 +1512,6 @@ static inline void *skb_header_pointer(const struct sk_buff *skb, int offset,
 }
 
 extern void skb_init(void);
-extern void skb_add_mtu(int mtu);
 
 /**
  *	skb_get_timestamp - get timestamp from a skb

net/core/skbuff.c

@@ -157,7 +157,6 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 	if (!skb)
 		goto out;
 
-	/* Get the DATA. Size must match skb_add_mtu(). */
 	size = SKB_DATA_ALIGN(size);
 	data = kmalloc_node_track_caller(size + sizeof(struct skb_shared_info),
 			gfp_mask, node);
@@ -1533,19 +1532,6 @@ void skb_insert(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head
 	spin_unlock_irqrestore(&list->lock, flags);
 }
 
-#if 0
-/*
- * 	Tune the memory allocator for a new MTU size.
- */
-void skb_add_mtu(int mtu)
-{
-	/* Must match allocation in alloc_skb */
-	mtu = SKB_DATA_ALIGN(mtu) + sizeof(struct skb_shared_info);
-
-	kmem_add_cache_size(mtu);
-}
-#endif
-
 static inline void skb_split_inside_header(struct sk_buff *skb,
 					   struct sk_buff* skb1,
 					   const u32 len, const int pos)