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 <nasa4...@gmail.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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