From 33e0de57cd314b7620e2755d0f69080f56081cc3 Mon Sep 17 00:00:00 2001
From: Huang Ying <ying.huang@intel.com>
Date: Thu, 8 Sep 2011 14:00:45 +0800
Subject: [PATCH] --- yaml --- r: 269166 b: refs/heads/master c:
 781f7fd916fc77a862e20063ed3aeedf173234f9 h: refs/heads/master v: v3

---
 [refs]                      | 2 +-
 trunk/include/linux/llist.h | 6 +++++-
 trunk/lib/llist.c           | 6 +++++-
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 1c6fc8642911..0aeb448593ba 100644
--- 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
index ca91875286bf..27bbdf5ddf82 100644
--- 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
index 6c69f1d14c4b..878985c4d19d 100644
--- 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);