scripts/config: sync with linux upstream

[oweals/openwrt.git] / scripts / config / list.h

diff --git a/scripts/config/list.h b/scripts/config/list.h
index 0ae730be5f49d87025601300ba3a7bb86110f3eb..2cf23f002d3f48f6b51ac9898fde7681ea39cf53 100644 (file)
--- a/scripts/config/list.h
+++ b/scripts/config/list.h
@@ -34,7 +34,7 @@ struct list_head {
  * list_entry - get the struct for this entry
  * @ptr:       the &struct list_head pointer.
  * @type:      the type of the struct this is embedded in.
- * @member:    the name of the list_struct within the struct.
+ * @member:    the name of the list_head within the struct.
  */
 #define list_entry(ptr, type, member) \
        container_of(ptr, type, member)
@@ -43,13 +43,26 @@ struct list_head {
  * list_for_each_entry -       iterate over list of given type
  * @pos:       the type * to use as a loop cursor.
  * @head:      the head for your list.
- * @member:    the name of the list_struct within the struct.
+ * @member:    the name of the list_head within the struct.
  */
 #define list_for_each_entry(pos, head, member)                         \
        for (pos = list_entry((head)->next, typeof(*pos), member);      \
             &pos->member != (head);    \
             pos = list_entry(pos->member.next, typeof(*pos), member))
 
+/**
+ * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @pos:       the type * to use as a loop cursor.
+ * @n:         another type * to use as temporary storage
+ * @head:      the head for your list.
+ * @member:    the name of the list_head within the struct.
+ */
+#define list_for_each_entry_safe(pos, n, head, member)                 \
+       for (pos = list_entry((head)->next, typeof(*pos), member),      \
+               n = list_entry(pos->member.next, typeof(*pos), member); \
+            &pos->member != (head);                                    \
+            pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
 /**
  * list_empty - tests whether a list is empty
  * @head: the list to test.
@@ -88,4 +101,31 @@ static inline void list_add_tail(struct list_head *_new, struct list_head *head)
        __list_add(_new, head->prev, head);
 }
 
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_del(struct list_head *prev, struct list_head *next)
+{
+       next->prev = prev;
+       prev->next = next;
+}
+
+#define LIST_POISON1  ((void *) 0x00100100)
+#define LIST_POISON2  ((void *) 0x00200200)
+/**
+ * list_del - deletes entry from list.
+ * @entry: the element to delete from the list.
+ * Note: list_empty() on entry does not return true after this, the entry is
+ * in an undefined state.
+ */
+static inline void list_del(struct list_head *entry)
+{
+       __list_del(entry->prev, entry->next);
+       entry->next = (struct list_head*)LIST_POISON1;
+       entry->prev = (struct list_head*)LIST_POISON2;
+}
 #endif