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Subject[patch 4 11/22] hlist: Add hlist_is_singular_node() helper
Required to figure out whether the entry is the only one in the hlist.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Chris Mason <clm@fb.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: rt@linutronix.de
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Arjan van de Ven <arjan@infradead.org>

---
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.
*/

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