cgroup: set 'start' with the right value in cgroup_path.

'start' is set to buf + buflen and do the '--' immediately.
Just set it to 'buf + buflen - 1' directly.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 3070164..998ab59 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1770,9 +1770,9 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen)
                return 0;
        }
 
-       start = buf + buflen;
+       start = buf + buflen - 1;
 
-       *--start = '\0';
+       *start = '\0';
        for (;;) {
                int len = dentry->d_name.len;