X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=include%2Flinux%2Fskbuff.h;h=755e9cddac47eebe516751a55929f4339b576c5f;hb=20253de9d566f02b82aa1e0c103f73e80619106a;hp=b91fbfb7d54ca5f71621fb490d6504e98988ffb3;hpb=8af2745645243b5e5b031504a643bf2158571dc7;p=powerpc.git

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index b91fbfb7d5..755e9cddac 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -604,12 +604,17 @@ static inline __u32 skb_queue_len(const struct sk_buff_head *list_)
 	return list_->qlen;
 }
 
-extern struct lock_class_key skb_queue_lock_key;
-
+/*
+ * This function creates a split out lock class for each invocation;
+ * this is needed for now since a whole lot of users of the skb-queue
+ * infrastructure in drivers have different locking usage (in hardirq)
+ * than the networking core (in softirq only). In the long run either the
+ * network layer or drivers should need annotation to consolidate the
+ * main types of usage into 3 classes.
+ */
 static inline void skb_queue_head_init(struct sk_buff_head *list)
 {
 	spin_lock_init(&list->lock);
-	lockdep_set_class(&list->lock, &skb_queue_lock_key);
 	list->prev = list->next = (struct sk_buff *)list;
 	list->qlen = 0;
 }
@@ -1034,6 +1039,21 @@ static inline int pskb_trim(struct sk_buff *skb, unsigned int len)
 	return (len < skb->len) ? __pskb_trim(skb, len) : 0;
 }
 
+/**
+ *	pskb_trim_unique - remove end from a paged unique (not cloned) buffer
+ *	@skb: buffer to alter
+ *	@len: new length
+ *
+ *	This is identical to pskb_trim except that the caller knows that
+ *	the skb is not cloned so we should never get an error due to out-
+ *	of-memory.
+ */
+static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len)
+{
+	int err = pskb_trim(skb, len);
+	BUG_ON(err);
+}
+
 /**
  *	skb_orphan - orphan a buffer
  *	@skb: buffer to orphan
@@ -1076,7 +1096,7 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
  *	the headroom they think they need without accounting for the
  *	built in space. The built in space is used for optimisations.
  *
- *	%NULL is returned in there is no free memory.
+ *	%NULL is returned if there is no free memory.
  */
 static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
 					      gfp_t gfp_mask)
@@ -1096,7 +1116,7 @@ static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
  *	the headroom they think they need without accounting for the
  *	built in space. The built in space is used for optimisations.
  *
- *	%NULL is returned in there is no free memory. Although this function
+ *	%NULL is returned if there is no free memory. Although this function
  *	allocates memory it can be called from an interrupt.
  */
 static inline struct sk_buff *dev_alloc_skb(unsigned int length)