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authorChristoph Hellwig <hch@infradead.org>2013-11-14 14:32:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-15 09:32:22 +0900
commitb89241e8cdb8321c20546d47645a9b65b58113b5 (patch)
treede330bd740b3f7e24f834df48b3db47dc1c75889 /lib/llist.c
parentca5ecd64c2cdbcd316d789467147e732746f39fa (diff)
downloadblackbird-op-linux-b89241e8cdb8321c20546d47645a9b65b58113b5.tar.gz
blackbird-op-linux-b89241e8cdb8321c20546d47645a9b65b58113b5.zip
llists: move llist_reverse_order from raid5 to llist.c
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>
Diffstat (limited to 'lib/llist.c')
-rw-r--r--lib/llist.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/llist.c b/lib/llist.c
index 4a70d120138c..ef48b87247ec 100644
--- a/lib/llist.c
+++ b/lib/llist.c
@@ -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);
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