linux-kernel - [PATCH] cgroup: use uninitialized_var() for may-be uninitialized variable

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Date:	Tue, 22 Apr 2014 13:44:39 +0800
From:	Jianyu Zhan <nasa4836@...il.com>
To:	tj@...nel.org, lizefan@...wei.com
Cc:	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, nasa4836@...il.com
Subject: [PATCH] cgroup: use uninitialized_var() for may-be uninitialized variable

To suppress this warning:

 warning: ‘err’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  int err;
	^

Use the uninitialized_var() to decalre err. It also serves to be good documetation.

Signed-off-by: Jianyu Zhan <nasa4836@...il.com>
---
 kernel/cgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 24675f5..930569c 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4144,7 +4144,7 @@ static int create_css(struct cgroup *cgrp, struct cgroup_subsys *ss)
 {
 	struct cgroup *parent = cgrp->parent;
 	struct cgroup_subsys_state *css;
-	int err;
+	int uninitialized_var(err);
 
 	lockdep_assert_held(&cgroup_mutex);
 
-- 
2.0.0-rc0

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