linux-kernel - [PATCH 1/3] cgroup: cosmetic update to cgroup_taskset

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Message-Id: <20161229221115.31995-2-tj@kernel.org>
Date:   Thu, 29 Dec 2016 17:11:13 -0500
From:   Tejun Heo <tj@...nel.org>
To:     lizefan@...wei.com, hannes@...xchg.org
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tejun Heo <tj@...nel.org>
Subject: [PATCH 1/3] 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@...nel.org>
---
 kernel/cgroup/cgroup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index d9d82e9..aed492e 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);
 }
 
 /**
-- 
2.9.3