Merge branch 'upstream-greg' of gregkh@master.kernel.org:/pub/scm/linux/kernel/git...

[powerpc.git] / include / linux / skbuff.h

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index b91fbfb..755e9cd 100644 (file)
--- 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)