net: access page->private by using page_private

Signed-off-by: Sunghan Suh <sunghan.suh@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/skbuff.c

@@ -824,7 +824,7 @@ int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask)
 		page = alloc_page(gfp_mask);
 		if (!page) {
 			while (head) {
-				struct page *next = (struct page *)head->private;
+				struct page *next = (struct page *)page_private(head);
 				put_page(head);
 				head = next;
 			}
@@ -834,7 +834,7 @@ int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask)
 		memcpy(page_address(page),
 		       vaddr + f->page_offset, skb_frag_size(f));
 		kunmap_atomic(vaddr);
-		page->private = (unsigned long)head;
+		set_page_private(page, (unsigned long)head);
 		head = page;
 	}
 
@@ -848,7 +848,7 @@ int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask)
 	for (i = num_frags - 1; i >= 0; i--) {
 		__skb_fill_page_desc(skb, i, head, 0,
 				     skb_shinfo(skb)->frags[i].size);
-		head = (struct page *)head->private;
+		head = (struct page *)page_private(head);
 	}
 
 	skb_shinfo(skb)->tx_flags &= ~SKBTX_DEV_ZEROCOPY;