Merge branch 'linus' into cpumask-for-linus

Conflicts:
	arch/x86/kernel/cpu/common.c

1 files changed, 170 insertions, 65 deletions

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c6a6b166f8d..6acbf9e79eb 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -55,6 +55,7 @@
 #include <linux/rtnetlink.h>
 #include <linux/init.h>
 #include <linux/scatterlist.h>
+#include <linux/errqueue.h>
 
 #include <net/protocol.h>
 #include <net/dst.h>
@@ -64,6 +65,7 @@
 
 #include <asm/uaccess.h>
 #include <asm/system.h>
+#include <trace/skb.h>
 
 #include "kmap_skb.h"
 
@@ -123,6 +125,7 @@ void skb_over_panic(struct sk_buff *skb, int sz, void *here)
 	       skb->dev ? skb->dev->name : "<NULL>");
 	BUG();
 }
+EXPORT_SYMBOL(skb_over_panic);
 
 /**
  *	skb_under_panic	- 	private function
@@ -142,6 +145,7 @@ void skb_under_panic(struct sk_buff *skb, int sz, void *here)
 	       skb->dev ? skb->dev->name : "<NULL>");
 	BUG();
 }
+EXPORT_SYMBOL(skb_under_panic);
 
 /* 	Allocate a new skbuff. We do this ourselves so we can fill in a few
  *	'private' fields and also do memory statistics to find all the
@@ -205,7 +209,9 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 	shinfo->gso_segs = 0;
 	shinfo->gso_type = 0;
 	shinfo->ip6_frag_id = 0;
+	shinfo->tx_flags.flags = 0;
 	shinfo->frag_list = NULL;
+	memset(&shinfo->hwtstamps, 0, sizeof(shinfo->hwtstamps));
 
 	if (fclone) {
 		struct sk_buff *child = skb + 1;
@@ -223,6 +229,7 @@ nodata:
 	skb = NULL;
 	goto out;
 }
+EXPORT_SYMBOL(__alloc_skb);
 
 /**
  *	__netdev_alloc_skb - allocate an skbuff for rx on a specific device
@@ -250,6 +257,7 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
 	}
 	return skb;
 }
+EXPORT_SYMBOL(__netdev_alloc_skb);
 
 struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask)
 {
@@ -418,6 +426,7 @@ void __kfree_skb(struct sk_buff *skb)
 	skb_release_all(skb);
 	kfree_skbmem(skb);
 }
+EXPORT_SYMBOL(__kfree_skb);
 
 /**
  *	kfree_skb - free an sk_buff
@@ -434,8 +443,30 @@ void kfree_skb(struct sk_buff *skb)
 		smp_rmb();
 	else if (likely(!atomic_dec_and_test(&skb->users)))
 		return;
+	trace_kfree_skb(skb, __builtin_return_address(0));
+	__kfree_skb(skb);
+}
+EXPORT_SYMBOL(kfree_skb);
+
+/**
+ *	consume_skb - free an skbuff
+ *	@skb: buffer to free
+ *
+ *	Drop a ref to the buffer and free it if the usage count has hit zero
+ *	Functions identically to kfree_skb, but kfree_skb assumes that the frame
+ *	is being dropped after a failure and notes that
+ */
+void consume_skb(struct sk_buff *skb)
+{
+	if (unlikely(!skb))
+		return;
+	if (likely(atomic_read(&skb->users) == 1))
+		smp_rmb();
+	else if (likely(!atomic_dec_and_test(&skb->users)))
+		return;
 	__kfree_skb(skb);
 }
+EXPORT_SYMBOL(consume_skb);
 
 /**
  *	skb_recycle_check - check if skb can be reused for receive
@@ -605,6 +636,7 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
 
 	return __skb_clone(n, skb);
 }
+EXPORT_SYMBOL(skb_clone);
 
 static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 {
@@ -671,7 +703,7 @@ struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t gfp_mask)
 	copy_skb_header(n, skb);
 	return n;
 }
-
+EXPORT_SYMBOL(skb_copy);
 
 /**
  *	pskb_copy	-	create copy of an sk_buff with private head.
@@ -730,6 +762,7 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
 out:
 	return n;
 }
+EXPORT_SYMBOL(pskb_copy);
 
 /**
  *	pskb_expand_head - reallocate header of &sk_buff
@@ -813,6 +846,7 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
 nodata:
 	return -ENOMEM;
 }
+EXPORT_SYMBOL(pskb_expand_head);
 
 /* Make private copy of skb with writable head and some headroom */
 
@@ -833,7 +867,7 @@ struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, unsigned int headroom)
 	}
 	return skb2;
 }
-
+EXPORT_SYMBOL(skb_realloc_headroom);
 
 /**
  *	skb_copy_expand	-	copy and expand sk_buff
@@ -898,6 +932,7 @@ struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
 
 	return n;
 }
+EXPORT_SYMBOL(skb_copy_expand);
 
 /**
  *	skb_pad			-	zero pad the tail of an skb
@@ -943,6 +978,7 @@ free_skb:
 	kfree_skb(skb);
 	return err;
 }
+EXPORT_SYMBOL(skb_pad);
 
 /**
  *	skb_put - add data to a buffer
@@ -1100,6 +1136,7 @@ done:
 
 	return 0;
 }
+EXPORT_SYMBOL(___pskb_trim);
 
 /**
  *	__pskb_pull_tail - advance tail of skb header
@@ -1193,8 +1230,7 @@ unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta)
 					insp = list;
 				}
 				if (!pskb_pull(list, eat)) {
-					if (clone)
-						kfree_skb(clone);
+					kfree_skb(clone);
 					return NULL;
 				}
 				break;
@@ -1238,6 +1274,7 @@ pull_pages:
 
 	return skb_tail_pointer(skb);
 }
+EXPORT_SYMBOL(__pskb_pull_tail);
 
 /* Copy some data bits from skb to kernel buffer. */
 
@@ -1315,6 +1352,7 @@ int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len)
 fault:
 	return -EFAULT;
 }
+EXPORT_SYMBOL(skb_copy_bits);
 
 /*
  * Callback from splice_to_pipe(), if we need to release some pages
@@ -1325,14 +1363,39 @@ static void sock_spd_release(struct splice_pipe_desc *spd, unsigned int i)
 	put_page(spd->pages[i]);
 }
 
-static inline struct page *linear_to_page(struct page *page, unsigned int len,
-					  unsigned int offset)
+static inline struct page *linear_to_page(struct page *page, unsigned int *len,
+					  unsigned int *offset,
+					  struct sk_buff *skb)
 {
-	struct page *p = alloc_pages(GFP_KERNEL, 0);
+	struct sock *sk = skb->sk;
+	struct page *p = sk->sk_sndmsg_page;
+	unsigned int off;
 
-	if (!p)
-		return NULL;
-	memcpy(page_address(p) + offset, page_address(page) + offset, len);
+	if (!p) {
+new_page:
+		p = sk->sk_sndmsg_page = alloc_pages(sk->sk_allocation, 0);
+		if (!p)
+			return NULL;
+
+		off = sk->sk_sndmsg_off = 0;
+		/* hold one ref to this page until it's full */
+	} else {
+		unsigned int mlen;
+
+		off = sk->sk_sndmsg_off;
+		mlen = PAGE_SIZE - off;
+		if (mlen < 64 && mlen < *len) {
+			put_page(p);
+			goto new_page;
+		}
+
+		*len = min_t(unsigned int, *len, mlen);
+	}
+
+	memcpy(page_address(p) + off, page_address(page) + *offset, *len);
+	sk->sk_sndmsg_off += *len;
+	*offset = off;
+	get_page(p);
 
 	return p;
 }
@@ -1341,21 +1404,21 @@ static inline struct page *linear_to_page(struct page *page, unsigned int len,
  * Fill page/offset/length into spd, if it can hold more pages.
  */
 static inline int spd_fill_page(struct splice_pipe_desc *spd, struct page *page,
-				unsigned int len, unsigned int offset,
+				unsigned int *len, unsigned int offset,
 				struct sk_buff *skb, int linear)
 {
 	if (unlikely(spd->nr_pages == PIPE_BUFFERS))
 		return 1;
 
 	if (linear) {
-		page = linear_to_page(page, len, offset);
+		page = linear_to_page(page, len, &offset, skb);
 		if (!page)
 			return 1;
 	} else
 		get_page(page);
 
 	spd->pages[spd->nr_pages] = page;
-	spd->partial[spd->nr_pages].len = len;
+	spd->partial[spd->nr_pages].len = *len;
 	spd->partial[spd->nr_pages].offset = offset;
 	spd->nr_pages++;
 
@@ -1365,8 +1428,13 @@ static inline int spd_fill_page(struct splice_pipe_desc *spd, struct page *page,
 static inline void __segment_seek(struct page **page, unsigned int *poff,
 				  unsigned int *plen, unsigned int off)
 {
+	unsigned long n;
+
 	*poff += off;
-	*page += *poff / PAGE_SIZE;
+	n = *poff / PAGE_SIZE;
+	if (n)
+		*page = nth_page(*page, n);
+
 	*poff = *poff % PAGE_SIZE;
 	*plen -= off;
 }
@@ -1397,7 +1465,7 @@ static inline int __splice_segment(struct page *page, unsigned int poff,
 		/* the linear region may spread across several pages  */
 		flen = min_t(unsigned int, flen, PAGE_SIZE - poff);
 
-		if (spd_fill_page(spd, page, flen, poff, skb, linear))
+		if (spd_fill_page(spd, page, &flen, poff, skb, linear))
 			return 1;
 
 		__segment_seek(&page, &poff, &plen, flen);
@@ -1590,7 +1658,6 @@ int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len)
 fault:
 	return -EFAULT;
 }
-
 EXPORT_SYMBOL(skb_store_bits);
 
 /* Checksum skb data. */
@@ -1667,6 +1734,7 @@ __wsum skb_checksum(const struct sk_buff *skb, int offset,
 
 	return csum;
 }
+EXPORT_SYMBOL(skb_checksum);
 
 /* Both of above in one bottle. */
 
@@ -1748,6 +1816,7 @@ __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset,
 	BUG_ON(len);
 	return csum;
 }
+EXPORT_SYMBOL(skb_copy_and_csum_bits);
 
 void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to)
 {
@@ -1774,6 +1843,7 @@ void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to)
 		*((__sum16 *)(to + csstuff)) = csum_fold(csum);
 	}
 }
+EXPORT_SYMBOL(skb_copy_and_csum_dev);
 
 /**
  *	skb_dequeue - remove from the head of the queue
@@ -1794,6 +1864,7 @@ struct sk_buff *skb_dequeue(struct sk_buff_head *list)
 	spin_unlock_irqrestore(&list->lock, flags);
 	return result;
 }
+EXPORT_SYMBOL(skb_dequeue);
 
 /**
  *	skb_dequeue_tail - remove from the tail of the queue
@@ -1813,6 +1884,7 @@ struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list)
 	spin_unlock_irqrestore(&list->lock, flags);
 	return result;
 }
+EXPORT_SYMBOL(skb_dequeue_tail);
 
 /**
  *	skb_queue_purge - empty a list
@@ -1828,6 +1900,7 @@ void skb_queue_purge(struct sk_buff_head *list)
 	while ((skb = skb_dequeue(list)) != NULL)
 		kfree_skb(skb);
 }
+EXPORT_SYMBOL(skb_queue_purge);
 
 /**
  *	skb_queue_head - queue a buffer at the list head
@@ -1848,6 +1921,7 @@ void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk)
 	__skb_queue_head(list, newsk);
 	spin_unlock_irqrestore(&list->lock, flags);
 }
+EXPORT_SYMBOL(skb_queue_head);
 
 /**
  *	skb_queue_tail - queue a buffer at the list tail
@@ -1868,6 +1942,7 @@ void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk)
 	__skb_queue_tail(list, newsk);
 	spin_unlock_irqrestore(&list->lock, flags);
 }
+EXPORT_SYMBOL(skb_queue_tail);
 
 /**
  *	skb_unlink	-	remove a buffer from a list
@@ -1887,6 +1962,7 @@ void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list)
 	__skb_unlink(skb, list);
 	spin_unlock_irqrestore(&list->lock, flags);
 }
+EXPORT_SYMBOL(skb_unlink);
 
 /**
  *	skb_append	-	append a buffer
@@ -1906,7 +1982,7 @@ void skb_append(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head
 	__skb_queue_after(list, old, newsk);
 	spin_unlock_irqrestore(&list->lock, flags);
 }
-
+EXPORT_SYMBOL(skb_append);
 
 /**
  *	skb_insert	-	insert a buffer
@@ -1928,6 +2004,7 @@ void skb_insert(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head
 	__skb_insert(newsk, old->prev, old, list);
 	spin_unlock_irqrestore(&list->lock, flags);
 }
+EXPORT_SYMBOL(skb_insert);
 
 static inline void skb_split_inside_header(struct sk_buff *skb,
 					   struct sk_buff* skb1,
@@ -2006,6 +2083,7 @@ void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len)
 	else		/* Second chunk has no header, nothing to copy. */
 		skb_split_no_header(skb, skb1, len, pos);
 }
+EXPORT_SYMBOL(skb_split);
 
 /* Shifting from/to a cloned skb is a no-go.
  *
@@ -2168,6 +2246,7 @@ void skb_prepare_seq_read(struct sk_buff *skb, unsigned int from,
 	st->frag_idx = st->stepped_offset = 0;
 	st->frag_data = NULL;
 }
+EXPORT_SYMBOL(skb_prepare_seq_read);
 
 /**
  * skb_seq_read - Sequentially read skb data
@@ -2255,6 +2334,7 @@ next_skb:
 
 	return 0;
 }
+EXPORT_SYMBOL(skb_seq_read);
 
 /**
  * skb_abort_seq_read - Abort a sequential read of skb data
@@ -2268,6 +2348,7 @@ void skb_abort_seq_read(struct skb_seq_state *st)
 	if (st->frag_data)
 		kunmap_skb_frag(st->frag_data);
 }
+EXPORT_SYMBOL(skb_abort_seq_read);
 
 #define TS_SKB_CB(state)	((struct skb_seq_state *) &((state)->cb))
 
@@ -2310,6 +2391,7 @@ unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,
 	ret = textsearch_find(config, state);
 	return (ret <= to - from ? ret : UINT_MAX);
 }
+EXPORT_SYMBOL(skb_find_text);
 
 /**
  * skb_append_datato_frags: - append the user data to a skb
@@ -2382,6 +2464,7 @@ int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb,
 
 	return 0;
 }
+EXPORT_SYMBOL(skb_append_datato_frags);
 
 /**
  *	skb_pull_rcsum - pull skb and update receive checksum
@@ -2569,7 +2652,6 @@ err:
 	}
 	return ERR_PTR(err);
 }
-
 EXPORT_SYMBOL_GPL(skb_segment);
 
 int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
@@ -2577,17 +2659,23 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 	struct sk_buff *p = *head;
 	struct sk_buff *nskb;
 	unsigned int headroom;
-	unsigned int hlen = p->data - skb_mac_header(p);
-	unsigned int len = skb->len;
+	unsigned int len = skb_gro_len(skb);
 
-	if (hlen + p->len + len >= 65536)
+	if (p->len + len >= 65536)
 		return -E2BIG;
 
 	if (skb_shinfo(p)->frag_list)
 		goto merge;
-	else if (!skb_headlen(p) && !skb_headlen(skb) &&
-		 skb_shinfo(p)->nr_frags + skb_shinfo(skb)->nr_frags <
-		 MAX_SKB_FRAGS) {
+	else if (skb_headlen(skb) <= skb_gro_offset(skb)) {
+		if (skb_shinfo(p)->nr_frags + skb_shinfo(skb)->nr_frags >
+		    MAX_SKB_FRAGS)
+			return -E2BIG;
+
+		skb_shinfo(skb)->frags[0].page_offset +=
+			skb_gro_offset(skb) - skb_headlen(skb);
+		skb_shinfo(skb)->frags[0].size -=
+			skb_gro_offset(skb) - skb_headlen(skb);
+
 		memcpy(skb_shinfo(p)->frags + skb_shinfo(p)->nr_frags,
 		       skb_shinfo(skb)->frags,
 		       skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
@@ -2604,7 +2692,7 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 	}
 
 	headroom = skb_headroom(p);
-	nskb = netdev_alloc_skb(p->dev, headroom);
+	nskb = netdev_alloc_skb(p->dev, headroom + skb_gro_offset(p));
 	if (unlikely(!nskb))
 		return -ENOMEM;
 
@@ -2612,12 +2700,15 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 	nskb->mac_len = p->mac_len;
 
 	skb_reserve(nskb, headroom);
+	__skb_put(nskb, skb_gro_offset(p));
 
-	skb_set_mac_header(nskb, -hlen);
+	skb_set_mac_header(nskb, skb_mac_header(p) - p->data);
 	skb_set_network_header(nskb, skb_network_offset(p));
 	skb_set_transport_header(nskb, skb_transport_offset(p));
 
-	memcpy(skb_mac_header(nskb), skb_mac_header(p), hlen);
+	__skb_pull(p, skb_gro_offset(p));
+	memcpy(skb_mac_header(nskb), skb_mac_header(p),
+	       p->data - skb_mac_header(p));
 
 	*NAPI_GRO_CB(nskb) = *NAPI_GRO_CB(p);
 	skb_shinfo(nskb)->frag_list = p;
@@ -2636,6 +2727,17 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 	p = nskb;
 
 merge:
+	if (skb_gro_offset(skb) > skb_headlen(skb)) {
+		skb_shinfo(skb)->frags[0].page_offset +=
+			skb_gro_offset(skb) - skb_headlen(skb);
+		skb_shinfo(skb)->frags[0].size -=
+			skb_gro_offset(skb) - skb_headlen(skb);
+		skb_gro_reset_offset(skb);
+		skb_gro_pull(skb, skb_headlen(skb));
+	}
+
+	__skb_pull(skb, skb_gro_offset(skb));
+
 	p->prev->next = skb;
 	p->prev = skb;
 	skb_header_release(skb);
@@ -2747,6 +2849,7 @@ int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int le
 
 	return nsg;
 }
+EXPORT_SYMBOL_GPL(skb_to_sgvec);
 
 /**
  *	skb_cow_data - Check that a socket buffer's data buffers are writable
@@ -2856,6 +2959,45 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
 
 	return elt;
 }
+EXPORT_SYMBOL_GPL(skb_cow_data);
+
+void skb_tstamp_tx(struct sk_buff *orig_skb,
+		struct skb_shared_hwtstamps *hwtstamps)
+{
+	struct sock *sk = orig_skb->sk;
+	struct sock_exterr_skb *serr;
+	struct sk_buff *skb;
+	int err;
+
+	if (!sk)
+		return;
+
+	skb = skb_clone(orig_skb, GFP_ATOMIC);
+	if (!skb)
+		return;
+
+	if (hwtstamps) {
+		*skb_hwtstamps(skb) =
+			*hwtstamps;
+	} else {
+		/*
+		 * no hardware time stamps available,
+		 * so keep the skb_shared_tx and only
+		 * store software time stamp
+		 */
+		skb->tstamp = ktime_get_real();
+	}
+
+	serr = SKB_EXT_ERR(skb);
+	memset(serr, 0, sizeof(*serr));
+	serr->ee.ee_errno = ENOMSG;
+	serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
+	err = sock_queue_err_skb(sk, skb);
+	if (err)
+		kfree_skb(skb);
+}
+EXPORT_SYMBOL_GPL(skb_tstamp_tx);
+
 
 /**
  * skb_partial_csum_set - set up and verify partial csum values for packet
@@ -2884,6 +3026,7 @@ bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off)
 	skb->csum_offset = off;
 	return true;
 }
+EXPORT_SYMBOL_GPL(skb_partial_csum_set);
 
 void __skb_warn_lro_forwarding(const struct sk_buff *skb)
 {
@@ -2891,42 +3034,4 @@ void __skb_warn_lro_forwarding(const struct sk_buff *skb)
 		pr_warning("%s: received packets cannot be forwarded"
 			   " while LRO is enabled\n", skb->dev->name);
 }
-
-EXPORT_SYMBOL(___pskb_trim);
-EXPORT_SYMBOL(__kfree_skb);
-EXPORT_SYMBOL(kfree_skb);
-EXPORT_SYMBOL(__pskb_pull_tail);
-EXPORT_SYMBOL(__alloc_skb);
-EXPORT_SYMBOL(__netdev_alloc_skb);
-EXPORT_SYMBOL(pskb_copy);
-EXPORT_SYMBOL(pskb_expand_head);
-EXPORT_SYMBOL(skb_checksum);
-EXPORT_SYMBOL(skb_clone);
-EXPORT_SYMBOL(skb_copy);
-EXPORT_SYMBOL(skb_copy_and_csum_bits);
-EXPORT_SYMBOL(skb_copy_and_csum_dev);
-EXPORT_SYMBOL(skb_copy_bits);
-EXPORT_SYMBOL(skb_copy_expand);
-EXPORT_SYMBOL(skb_over_panic);
-EXPORT_SYMBOL(skb_pad);
-EXPORT_SYMBOL(skb_realloc_headroom);
-EXPORT_SYMBOL(skb_under_panic);
-EXPORT_SYMBOL(skb_dequeue);
-EXPORT_SYMBOL(skb_dequeue_tail);
-EXPORT_SYMBOL(skb_insert);
-EXPORT_SYMBOL(skb_queue_purge);
-EXPORT_SYMBOL(skb_queue_head);
-EXPORT_SYMBOL(skb_queue_tail);
-EXPORT_SYMBOL(skb_unlink);
-EXPORT_SYMBOL(skb_append);
-EXPORT_SYMBOL(skb_split);
-EXPORT_SYMBOL(skb_prepare_seq_read);
-EXPORT_SYMBOL(skb_seq_read);
-EXPORT_SYMBOL(skb_abort_seq_read);
-EXPORT_SYMBOL(skb_find_text);
-EXPORT_SYMBOL(skb_append_datato_frags);
 EXPORT_SYMBOL(__skb_warn_lro_forwarding);
-
-EXPORT_SYMBOL_GPL(skb_to_sgvec);
-EXPORT_SYMBOL_GPL(skb_cow_data);
-EXPORT_SYMBOL_GPL(skb_partial_csum_set);