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-rw-r--r--include/linux/llist.h6
-rw-r--r--lib/llist.c6
2 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/llist.h b/include/linux/llist.h
index ca91875286bf..27bbdf5ddf82 100644
--- a/include/linux/llist.h
+++ b/include/linux/llist.h
@@ -142,8 +142,10 @@ static inline bool llist_empty(const struct llist_head *head)
* llist_add - add a new entry
* @new: new entry to be added
* @head: the head for your lock-less list
+ *
+ * Return whether list is empty before adding.
*/
-static inline void llist_add(struct llist_node *new, struct llist_head *head)
+static inline bool llist_add(struct llist_node *new, struct llist_head *head)
{
struct llist_node *entry, *old_entry;
@@ -156,6 +158,8 @@ static inline void llist_add(struct llist_node *new, struct llist_head *head)
break;
cpu_relax();
}
+
+ return old_entry == NULL;
}
/**
diff --git a/lib/llist.c b/lib/llist.c
index 6c69f1d14c4b..878985c4d19d 100644
--- a/lib/llist.c
+++ b/lib/llist.c
@@ -34,8 +34,10 @@
* @new_first: first entry in batch to be added
* @new_last: last entry in batch to be added
* @head: the head for your lock-less list
+ *
+ * Return whether list is empty before adding.
*/
-void llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
+bool llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
struct llist_head *head)
{
struct llist_node *entry, *old_entry;
@@ -49,6 +51,8 @@ void llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
break;
cpu_relax();
}
+
+ return old_entry == NULL;
}
EXPORT_SYMBOL_GPL(llist_add_batch);