iommu/vt-d: Fix QI_DEV_IOTLB_PFSID and QI_DEV_EIOTLB_PFSID macros

[mirror_ubuntu-bionic-kernel.git] / include / linux / list.h

diff --git a/include/linux/list.h b/include/linux/list.h
index 4b129df4d46b5a4c26d970c6a0c385b6c208d9d1..de04cc5ed53673ebea7362bea2a43f8355018125 100644 (file)
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -285,6 +285,36 @@ static inline void list_cut_position(struct list_head *list,
                __list_cut_position(list, head, entry);
 }
 
+/**
+ * list_cut_before - cut a list into two, before given entry
+ * @list: a new list to add all removed entries
+ * @head: a list with entries
+ * @entry: an entry within head, could be the head itself
+ *
+ * This helper moves the initial part of @head, up to but
+ * excluding @entry, from @head to @list.  You should pass
+ * in @entry an element you know is on @head.  @list should
+ * be an empty list or a list you do not care about losing
+ * its data.
+ * If @entry == @head, all entries on @head are moved to
+ * @list.
+ */
+static inline void list_cut_before(struct list_head *list,
+                                  struct list_head *head,
+                                  struct list_head *entry)
+{
+       if (head->next == entry) {
+               INIT_LIST_HEAD(list);
+               return;
+       }
+       list->next = head->next;
+       list->next->prev = list;
+       list->prev = entry->prev;
+       list->prev->next = list;
+       head->next = entry;
+       entry->prev = head;
+}
+
 static inline void __list_splice(const struct list_head *list,
                                 struct list_head *prev,
                                 struct list_head *next)