llists: move llist_reverse_order from raid5 to llist.c
authorChristoph Hellwig <hch@infradead.org>
Thu, 14 Nov 2013 22:32:11 +0000 (14:32 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 15 Nov 2013 00:32:22 +0000 (09:32 +0900)
Make this useful helper available for other users.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/md/raid5.c
include/linux/llist.h
lib/llist.c

index f8b9068439267a3539d671e6e59ceb0b47b90547..7f0e17a27aebcd3b448dca34290ab1c735c89eb1 100644 (file)
@@ -293,20 +293,6 @@ static void __release_stripe(struct r5conf *conf, struct stripe_head *sh)
                do_release_stripe(conf, sh);
 }
 
-static struct llist_node *llist_reverse_order(struct llist_node *head)
-{
-       struct llist_node *new_head = NULL;
-
-       while (head) {
-               struct llist_node *tmp = head;
-               head = head->next;
-               tmp->next = new_head;
-               new_head = tmp;
-       }
-
-       return new_head;
-}
-
 /* should hold conf->device_lock already */
 static int release_stripe_list(struct r5conf *conf)
 {
index 8828a78dec9a2b3ed30d4c91f872405a8594f51a..fbf10a0bc0957c8bb2609da00969d88429797794 100644 (file)
@@ -195,4 +195,6 @@ static inline struct llist_node *llist_del_all(struct llist_head *head)
 
 extern struct llist_node *llist_del_first(struct llist_head *head);
 
+struct llist_node *llist_reverse_order(struct llist_node *head);
+
 #endif /* LLIST_H */
index 4a70d120138cc684eb633ad93c8abedea826b20d..ef48b87247ec0fec1b3cb19d28c35652e5d6c6fd 100644 (file)
@@ -81,3 +81,25 @@ struct llist_node *llist_del_first(struct llist_head *head)
        return entry;
 }
 EXPORT_SYMBOL_GPL(llist_del_first);
+
+/**
+ * llist_reverse_order - reverse order of a llist chain
+ * @head:      first item of the list to be reversed
+ *
+ * Reverse the oder of a chain of llist entries and return the
+ * new first entry.
+ */
+struct llist_node *llist_reverse_order(struct llist_node *head)
+{
+       struct llist_node *new_head = NULL;
+
+       while (head) {
+               struct llist_node *tmp = head;
+               head = head->next;
+               tmp->next = new_head;
+               new_head = tmp;
+       }
+
+       return new_head;
+}
+EXPORT_SYMBOL_GPL(llist_reverse_order);