Required to figure out whether the entry is the only one in the hlist.
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: [email protected]
Cc: "Paul E. McKenney" <[email protected]>
Cc: Arjan van de Ven <[email protected]>
---
include/linux/list.h | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -679,6 +679,16 @@ static inline bool hlist_fake(struct hli
}
/*
+ * Check whether the node is the only node of the head without
+ * accessing head.
+ */
+static inline bool hlist_is_singular_node(struct hlist_node *n,
+ struct hlist_head *h)
+{
+ return !n->next && n->pprev == &h->first;
+}
+
+/*
* Move a list from one list head to another. Fixup the pprev
* reference of the first entry if it exists.
*/
