---

yaml --- r: 269166 b: refs/heads/master c: 781f7fd h: refs/heads/master v: v3
git-mirror · Oct 4, 2011 · 33e0de5 · 33e0de5
1 parent a0f503f
commit 33e0de5
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Showing 3 changed files with 11 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a3127336b71f6833d1483c856dce91fe558dc3a9
+refs/heads/master: 781f7fd916fc77a862e20063ed3aeedf173234f9
diff --git a/trunk/include/linux/llist.h b/trunk/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/trunk/lib/llist.c b/trunk/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);