cgroup: remove a NULL check in cgroup_exit()

init_task.cgroups is initialized at boot phase, and whenver a ask
is forked, it's cgroups pointer is inherited from its parent, and
it's never set to NULL afterwards.

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

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index ad3359f..8da9048 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4994,8 +4994,7 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
        }
        task_unlock(tsk);
 
-       if (cg)
-               put_css_set_taskexit(cg);
+       put_css_set_taskexit(cg);
 }
 
 /**