cgroup: cosmetic update to cgroup_taskset_add()

cgroup_taskset_add() was using list_add_tail() when for source csets
but list_move_tail() for destination.  As the operations are gated by
list_empty() test, list_move_tail() is equivalent to list_add_tail()
here.  Use list_add_tail() too for destination csets too.

This doesn't cause any functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index d9d82e96d67f..aed492e907c1 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -1980,8 +1980,8 @@ static void cgroup_taskset_add(struct task_struct *task,
         if (list_empty(&cset->mg_node))
                 list_add_tail(&cset->mg_node, &tset->src_csets);
         if (list_empty(&cset->mg_dst_cset->mg_node))
-                list_move_tail(&cset->mg_dst_cset->mg_node,
-                               &tset->dst_csets);
+                list_add_tail(&cset->mg_dst_cset->mg_node,
+                              &tset->dst_csets);
 }
 
 /**