Merge with /home/shaggy/git/linus-clean/

[karo-tx-linux.git] / include / linux / list.h

diff --git a/include/linux/list.h b/include/linux/list.h
index fbfca73355a3a6791a3f2afb20fa41823c5f6fc6..945daa1f13dd05d6a7ad95e6022108a824d6a3dd 100644 (file)
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -202,12 +202,15 @@ static inline void list_del_rcu(struct list_head *entry)
  *
  * The old entry will be replaced with the new entry atomically.
  */
-static inline void list_replace_rcu(struct list_head *old, struct list_head *new){
+static inline void list_replace_rcu(struct list_head *old,
+                               struct list_head *new)
+{
        new->next = old->next;
        new->prev = old->prev;
        smp_wmb();
        new->next->prev = new;
        new->prev->next = new;
+       old->prev = LIST_POISON2;
 }
 
 /**
@@ -432,6 +435,20 @@ static inline void list_splice_init(struct list_head *list,
             &pos->member != (head);                                            \
             pos = n, n = list_entry(n->member.next, typeof(*n), member))
 
+/**
+ * list_for_each_entry_safe_reverse - iterate backwards over list of given type safe against
+ *                                   removal of list entry
+ * @pos:       the type * to use as a loop counter.
+ * @n:         another type * to use as temporary storage
+ * @head:      the head for your list.
+ * @member:    the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe_reverse(pos, n, head, member)         \
+       for (pos = list_entry((head)->prev, typeof(*pos), member),      \
+               n = list_entry(pos->member.prev, typeof(*pos), member); \
+            &pos->member != (head);                                    \
+            pos = n, n = list_entry(n->member.prev, typeof(*n), member))
+
 /**
  * list_for_each_rcu   -       iterate over an rcu-protected list
  * @pos:       the &struct list_head to use as a loop counter.
@@ -578,6 +595,27 @@ static inline void hlist_del_init(struct hlist_node *n)
        }
 }
 
+/*
+ * hlist_replace_rcu - replace old entry by new one
+ * @old : the element to be replaced
+ * @new : the new element to insert
+ *
+ * The old entry will be replaced with the new entry atomically.
+ */
+static inline void hlist_replace_rcu(struct hlist_node *old,
+                                       struct hlist_node *new)
+{
+       struct hlist_node *next = old->next;
+
+       new->next = next;
+       new->pprev = old->pprev;
+       smp_wmb();
+       if (next)
+               new->next->pprev = &new->next;
+       *new->pprev = new;
+       old->pprev = LIST_POISON2;
+}
+
 static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
 {
        struct hlist_node *first = h->first;